Hi All, I have a 03 Outback, auto, 90k miles. An engine with a long-duration cam will experience a significant loss of low-end torque unless the corrected compression is matched to the cam timing, specifically intake valve closing. A defect in the cooling system can also result in engine ping. Pelican Parts Forums > Porsche Forums > Porsche 911 Technical Forum: Pinging at High RPM when Hot. Knocking is not just upsetting: it's dangerous. Check the spark plugs, if it is a little white on the ground electrode, it runs lean caused by vacuum leak. The fact the the engine pings at 3,000 RPM make sense because that's where the engine is developing peak cylinder pressure. Possible culprits could include too low octane fuel, maladusted timing and carbon deposits in the combustion chambers. You may have to test it and re-adjust the timing and try again. Most small block Chevy engines like about 32-38 degrees total advance, all in by 3000 RPM or less if the engine and fuel will allow. Release the valve and it should return to normal. An electrically-assisted turbocharger (both exhaust gas driven and electrically driven) allows the boost pressure to be independent of the engine operation. "Pinging" in a gas engine is a result of the air/fuel mixture igniting prematurely, due to the heat of compression (in the case of excessively low octane fuel), over-advanced ignition timing or ignition caused by contact with superheated carbon deposits in the engine. If a car is pinging at low rpm and high load on 87, I wouldn't be too surprised since the tune is being "dialed back" in all areas to keep knock at bay. The low RPM, locked converter, and timing advance to the point of ping are the reason you're getting 19. A street/strip car that runs on pump gas may “ping” with this much. i have seen a piston. Obviously at high rpm this is good for maintaining power since the short rod engine would have the piston halfway down its stroke in no time (no push)! Conversely, the short rod engine at low rpms and high loads will not ping and the engine has "leverage" to spin the crank, where the long rod engine "stalls". Absolutely love my JLUR 6 speed manual but wondering if anyone else is having issues with low rpm pinging? If I'm coasting to a stop w clutch engaged or trans in neutral rpm will drop far below normal idle and engine pings intermitently. I was putting regular 87 octane gas, then i tried to switching to 93 octane premium. Lowering the compression ratio of the engine. Later exhaust valve opening helps low rpm performance by keeping pressure on the piston longer, and it reduces emissions. If you are shifting below 2k RPM you are shifting too soon at too low RPM. Opening the throttle calls for a downshift and raises the upshift point rpm via a cable attached to the throttle body. The high rpm failure is the spark plug might be failing. 5PSI (300 KPa) = 60lb/hr / 12. Last time I went wheeling, I had to either idle or apply more throttle than I preferred just to keep the. I am wondering about using a heavier grade of oil and/or an additive to try to quiet this down. Hope this helps. 4 A special procedure must be followed to check or adjust timing. Carbon buildup inside the cylinders can also cause this. Two very different motors only having in common the position of the cylinders (flat) and their number (two). Overheating, too much advance in the ignition, too low octane gas being used, among a few other things. In some cases the pressure rise can be so great that it causes an audible pinging noise from the engine. This is a partially a function of the cam. The pinging was slight and it would have been reasonable to have been in 4th rather then 5th at the time, so I didn't pay it much attention. Race engine 2 or 3 times under no-load, then run engine at idle speed. To test, with engine running, take a screwdriver and open the valve (pull the rod away from the engine). Piston wrist pin or worn crankshaft bearing. Got a load whirling sound front of engine at 2500 rpms and higher help 103 2012 blackline. First, do not confuse engine ping with a mechanical failure that produces an internal knock in the engine. If I give her more gas or get up to 55mph the sound seems to go away completely. Following the steps. We do a full test run on every engine we build on a test mule. This skecth shows how to get the engine RPM using the standard OBD-II PIDs codes. Got a load whirling sound front of engine at 2500 rpms and higher help 103 2012 blackline. In order to maintain testing accuracy, they monitored everything from the room temperature to the oil temperature. The engine has excessive timing advance for the fuel that is in it at the moment. 2L V8 pings (detonation) under heavy load. The other day it suddenly lost low end power and started pinging. Pinging/pinking is ALSO quite affected by ignition timing and piston speed, gasoline octane rating, and altitude (particularly carbureted engines), and is one of the several reasons that car engines generally have an automatic ignition timing device that is. will engine ping at under 2000rpm cause engine damage? i just changed my tune with an sf3/x3 from 87 octane to 93 octane. It is very difficult to hear the sound in well insulated luxury interiors of today's cars. Still pinging as much. Upto a maximum rpm limit of approx 1,800 rpm. This article discusses how knocking happens, describes three types of knocking, and gives you ten detailed discussions of system problems that cause. When engine temperature is between 60*-80*C, it pegs at "3" at about 1200 RPMS. Once an engine develops a noise like this, there is no easy fix. 0L Jeep advertised it had 90% of peak torque available at idle rpm and redline around 4,500, and my F250 has peak torque at 1,400 rpm and redline around 3,500. If the extra ports are open at low RPM, it can cause drivability issues and cause lower fuel economy. The Pilot Jet is screwed into the carburetor body and is located inside the float bowl. Knocking noise from engine. LSPI is most common in certain turbocharged direct-injection vehicles operating in low-speed and high-load driving conditions. Low-speed pre-ignition (LSPI), also known as stochastic pre-ignition (SPI), is a pre-ignition event that occurs in gasoline vehicle engines when there is a premature ignition of the main fuel charge. The second generator provides the signal that serves as a. This is usually a problem with high mileage or older diesel vehicles. So that's why I've stuck with Esso lately. Does it still ping when your coasting? The injectors are completely off when desired rpm is under the actual rpm, IE when your coasting. It doesn't sound metallic, piston slap should sound metallic, correct? I have read a little online about. This article discusses how knocking happens, describes three types of knocking, and gives you ten detailed discussions of system problems that cause. then there is a maximum to the amount of heat the water can absorb while it passes through the engine. At 1200 RPM with 8degr initial timing AFR goes up to 16+, this results in detonation. Its in the background a bit as i'm speeding up. So I bought my truck about a month ago 105K 2005 LLY RCLB and just recently it started rpm jumping when in park or in drive at idle. I wanted to make a thread to make sure you guys are aware that this is HORRIBLE for your engine. First, do not confuse engine ping with a mechanical failure that produces an internal knock in the engine. Bike is new to me and sat for 2 years - I cleaned the carb bowls and replaced the idle jets (could not clean them) and cleaned the main jets (135 stock per book). Set the total advance (28-34 degrees), make sure the initial advance is enough to achieve good off-idle response (8-12 degrees, sometimes requiring the distributor to be rebuilt), and then replace the advance weight springs with lighter springs until the engine pings with WOT at low rpm. If limit myself to no ping, then oem tune car is just faster no question. Low fuel pressure will cause a lean mixture in your engine which will result in misfires on all cylinders. "Pinging" is the metallic rattling sound an engine can make when accelerating. Everything else is different. Retarding the timing will cause the engine to cool down a bit and stop the pinging. The Pilot Jet is screwed into the carburetor body and is located inside the float bowl. The pilot jet is not difficult to set. Eventually, this could lead to a failed head gasket, broken rings, cracked piston lands and/or flatten your rod bearings. I can often repeat the sound on medium acceleration up an incline as well as when giving it some gas around the 1100 RPM (Low Speed Cruising) range. It is possible the misfire and the knocking are independent problems. Quite to the contrary after some months of low geared winter driving this Italian car definitely needed such an ITU. Hello people, I have a oil pressure problem, at idle after the engine has warmed to operating temperature the oil pressure in my truck is very low, but when the engine is loaded or just driving down the road at say 2000 rpm the oil pressure is fine, what could be the problem? The motor has 265,000km on it and runs good. I'm hearing a knock/ping when my car is idling, but when i rev in higher rpm i don't hear it. Try using a higher grade of octane gas. As the engine rpm increases, the pressure in the cylinder becomes so great that pumping losses occur to the piston. 4 supercharger kit given its low boost, low parasitic loss during non-boost conditions, and instant full boost throughout most of the RPM band. Additionally, there is pinging with moderate acceleration such as accelerating from a stop light. It's general rule that if a car is rated for 87 octane, then any higher is just throwing money away. Eventually, this could lead to a failed head gasket, broken rings, cracked piston lands and/or flatten your rod bearings. (Most factory engines are a compromise between economy, efficiency, reliability and performance; about 80% at red line. Coil Develops the high voltage required for the spark plugs. Many of the engine packages we have checked the ignition spark timing and air/fuel mixture curves on have had the correct ignition spark timing and air/fuel mixtures for high rpm/wide open throttle operation but need a lot of tuning work at low rpm/part throttle/normal driving conditions. i ran the car until it had about 1. So, on a hot engine, run it to 5k-6k RPM in 1st gear and or 2nd gear a couple times. If it still happens with quality 93 octane, then there may be something else going on. Engine Performance Data @ 1500 RPM 0. If an engine's knocking noise is less of a "ping," and instead more of a deep hammering noise, what could be the cause? Damaged rod bearings. The biggest problems faced by 4. I have noticed that many of my Indian friends tend to lug their engines ate low RPMS in an effort to squeeze out every bit of distance per unit fuel. (engine knocking). I think your pinging problem can be explained by your comment above. The engine must be at operating temp. Recently we took a trip towing a campertrailer weighing about 700kg, and during the trip we had to do a bit of hill climbing, when I noticed that the engine noise changed and there was a rattling sound similar to the "ping" in a petrol motor. The engine is tuned to achieve most of its torque at low revs at the expense of raw power at high revs, making the engine very responsive in day-to-day driving. The pinging goes away when the car get's warm because the knock sensor is only active above a certain engine temp(at least that what I've read). At lower engine loadings during part throttle or low RPM, detonation may be warranted. The torque peak of most 2stroke racing engines is a few thousand rpm below the horsepower peak. It’s not all bliss however: In high gear there can be a loss of power (at higher engines speeds) if there is too much timing. and I think the parameter is 950 -1150 RPM. Like most others, I have the low-idle / high ambient temperature pinging (or detonation, if you prefer). I have used some fuel system cleaner and fuel octane booster but it did not solve the issue. P 1: Post a reply to this message:. The tach should have a low-scale readout that is sensitive to increments of at least 50 rpm. The only real solution to fixing the rod knocking problem would be to rebuild your entire motor, which is obviously going to be expensive. 0 tdi engine noise at 1800 to 2000 rpm. Pelican Parts Forums > Porsche Forums > Porsche 911 Technical Forum: Pinging at High RPM when Hot. A buildup of lime and rust deposits in the head and block can also reduce heat transfer. At 2200-2300 rpm's ONLY the engine makes a rattling/pinging noise and goes away at any rpm below or above it. If you suspect rpm, then does it occur at the same rpm but in different gears. The information contained in this guide applies to all types of internal combustion engines: two stroke engines, rotary engines, high performance/racing engines and street vehicles. His engine was running hot and that was causing the pinging. If not, you're looking at the nature of the beast. It goes by several names — knock, pinging, detonation, etc. lots of low end. and hard to hear. We do a full test run on every engine we build on a test mule. ) The Pilot Jet meters the amount of fuel entering the low speed circuit. Low RPM hesitation and ping is associated with carbon building in many cases( fuel and ignition issues too) Looking at your spark plugs, you have some ignition/fuel delivery/fuel problems too. I've noticed on steep inclines at low speed my 2017 Jeep JKU makes a clicky pinging sound. Plymouth Barracuda & Dodge Challenger Message Board Forum. My truck (99 sonoma 2. It used to ping badly and I upgraded to top grade gas and the ping went away and the. If the diameter of the carburetor is too large for the engine, low RPM performance can be very poor. , and many of the terms can make the event seem rather innocuous. At the end of last season I started hearing a knocking sound at idle and during low rpm. Generally, there is a large signal at high engine rpms and lowe r signals at low rpms. Everything else is different. At the lower rpm, the integration period may be extended to gain more samples and effectively produce high sensitivity to obtain more output. The fact the the engine pings at 3,000 RPM make sense because that's where the engine is developing peak cylinder pressure. Now I notice it (only with the windows down) when coming off a light right when the engine passes 1500 rpm. The reason is rather technical, but is mainly related to the amount of residual exhaust gases which are left in the cylinder compared to the incoming charge. The higher the engine temperature, the higher the RPMs before it gets to "3", but always at "3" by 2000 rpms, even when the engine temperature is at 100*C. If it happens while accelerating, engine speed 2,000-3000 rpm, then that is probably it. Generally speaking, the oversquare engine is decent at low rpm, most efficient in the middle rpm range and has good high-rpm performance. while running whether the auto transmission is engaged or not its having a dip in engine RPM accompanied with a change in the engine sound while standstill. A common problem is too little ignition advance at part throttle, especially at about 10" vacuum and 1000 - 3000 rpm. Only at www. any advice. The dealer does not seem to have an idea what the noise could be. Use a vacuum gauge at that point in time to set idle mixture screws, 2 for a 2 or 4 bbl carb, 1 for a single bbl carb for a maximum vacuum reading at the same rpm used to set timing with and then reset curb idle rpm to your preferred number. a car has 4. Aluminum melts at approx. I notice that at idle to about 1500 rpm from inside the car, I am starting to hear a louder than normal ticking/pinging noise. Piston detonation nearly always is identified as an even that occurs at high power (high throttle setting), and moderate to higher rpm. A TSM will say something like 600 rpm with automatic in drive and 650 rpm with a standard transmission. When tuning periodically bump the accelerator and verify vacuum. Cannot control rpm during KOER Sell-Test high rpm check. At very low loads at barely part throttle most engines typically need 15 degrees of timing more than MBT at WOT for that given rpm. It all depends on the problem the knock sensor is causing. Clutching gurus, a question: Is shift rpm a quality indicator of HP change? An example: Lets assume a turbo running a stage 2 tune, and making an estimated 190 crankshaft HP at 8300 RPM. It mainly happened when under load and loosing rpm's. There won’t be any temperature changes to the engine, but the RPM of the engine will change. I set initial timing (no vac advance) at 10* at about 700 RPM. >breaking a little harder than normal both times causing the RPM's to go >down. He mentioned something like, not more than 1/2 throttle til pass 2x Idle?. The engine has lasted 12,000 miles so far with the light pinging at part throttle and doesn't show any signs of trouble from it. While a piston engine design can achieve very high compression at very, very low RPM, a turbine engine can not, because it is an open design. If it happens at real low engine speeds then you need to pull the initial timing back. 19 : Failure In PCM Internal voltage. is the RPM needle higher than normal. My truck (99 sonoma 2. Excess pinging, especially under moderate to heavy acceleration, can damage the engine. low end ping can often be caused by either overly advanced timing, or carbon deposits on the pistons, which themselves are caused by the incomplete combustion of fuel. As high-pressure exhaust escapes from a crack in the manifold or a leak in the gasket it will sound like ticking or clicking especially at idle or low engine RPMs. I spoke with a co-worker (he's into racing) yesterday about the pinging, and he says driving at that low of RPM and applying full throttle is engine abuse. Then accelerated about half throttle after leaving the round about and noticed heavy pinging till at least almost 2500 rpm's. , it pings if I try and get on it at lower rpm's. Dial total spark down to 2400 rpms and drive to test if the backfire issue is still present, can go as low as 2000-2200 if that helps 3. Figure 4 Knock intensity in 100 individual consecutive cycles in one cylinder of a V8 engine at 2400 rpm WOT Figure 5 Recent combustion chamber designs of 2 & 4 valve engines Figure 6 Simultaneously recorded pressure traces on opposite sides of the combustion chamber of the same cylinder during a heavy knock cycle. 0L strokers is pinging. Low RPM hesitation and ping is associated with carbon building in many cases( fuel and ignition issues too) Looking at your spark plugs, you have some ignition/fuel delivery/fuel problems too. I have an 02 with 60k mi. 5 Ohm side provides voltage to coil when Ignition Switch is in RUN position. Aluminum melts at approx. No constant pinging, no codes, only does it through this rpm range at low speed. If it happens while accelerating, engine speed 2,000-3000 rpm, then that is probably it. Needless to say, it's not an ideal situation. Most people will not even bother to adjust because it is so light and infrequent. When motor of my XJR 1300 2007 is hot, then engine starts pinging That mean - on low RPM not working evently. Having advanced timing tends to increase cylinder pressure, which in turn improves low RPM torque. If not, you're looking at the nature of the beast. Hard acceleration below 3,500 rpm after long bouts of steady cruising will ping. On the older speed density systems. Cruise low if you want, but downshift before applying power. Now I notice it (only with the windows down) when coming off a light right when the engine passes 1500 rpm. FlowKooler pumps also generate 22% more water pressure inside the engine block than other water pumps. It goes by several names — knock, pinging, detonation, etc. As the engine rpm increases, the pressure in the cylinder becomes so great that pumping losses occur to the piston. At low rpm the knock sensors Don't let the engine knock, but if the engine isn't even pinging, you can't confirm a knock sensor is "tuned" (that's just guessing). For me, that would be between 2000-5000 rpm depending on the situation. Needless to say, it's not an ideal situation. Seems when ambient air temp is above 80* is when it kicks in. A tapping at the top of the engine could be a problem in the valve train someplace. If you don't have a vacuum gauge, use a low-speed tachometer. It is usually caused by too lean a mixture or a fuel rated low in Octane or performance number. We do a full test run on every engine we build on a test mule. 96 Subaru EJ22 with hydraulic lifters engine knock. Ever since the new Ultra Low Sulfur Diesel Fuel came out my engine has been making a knocking, rattling, or pinging sound when under light load and accelerating. An engine that hesitates, stumbles or misfires when accelerating or when it is under load, is an engine that is either sucking too much air, not getting enough fuel, or misfiring. This should go away quickly and if you sustain the throttle usage and changes it will stay away until you get comfy cruising again. This is usually caused by unusual combustion of the mixture of air as well as fuel and it can very upsetting and dangerous. Ok I have a 4 year old Wright 36" stander with a Kawasaki 18. Low rpm performance will be good, but the thing will ping like crazy, and you'll break something eventually. My 98 Vortec 5. Pelican Parts Forums > Porsche Forums > Porsche 911 Technical Forum: Pinging at High RPM when Hot. the knocking can be heard at rpm lower than 2000 and sometimes till 3000 rpm. I don't think its a bearing as it doesn't have that same distinctive sound, and doesn't have the consistent "clunk" sound. On the left side of the engine, toward the front, and just below the cylinder head, is the block's serial number. I decided (as I am keeping the car and it has been overly maintained) that I would change the crank angle sensor and the knock sensors. An electrically-assisted turbocharger (both exhaust gas driven and electrically driven) allows the boost pressure to be independent of the engine operation. The most damaging knock/ping occurs at low to medium rpm near the torque peak rpm. ; Engine misfire - poor air/fuel mixture in the cylinders can cause an incomplete combustion event. Octane booster may help a bit, but really isn't good for the engine because it can leave deposits in the combustion chamber and on the plugs. When the engine is first started it idles normal. This is a discussion on Knocking/Ticking at low RPMs within the General Help forums, part of the LSx Technical Help Section category; I am hearing a knocking/ticking sound that relates to RPM that is in the top side of the engine, sounds. Pinging is a sharp metallic knocking that changes with throttle opening that you can hear in the engine bay or cabin, usually worsening under acceleration. The engine has 140,000 miles and consumes a quart of oil approximately every 2000 miles, so that's USUALLY not enough oil consumption to fool the PCM and cause the engine to run lean. The Situation is, that IT starts to ping, when its warm. just to get a little bit more infois your check engine light on, does it do it all the time or just in the mornings when you first started. One is detonation, and the other is preignition. You likely have a valve-train issue. Note that if the ignition timing is too advanced, pinging can occur at low RPM, in which case the ignition causes the event. 5 liter engine @ 3000 RPM. I believe the engine has a random spark advance at lower rpms. When you start the car from a cold start it'll idle in the low 800-900 rpms, rev up a few times into 1100-1200 then idle fine at 1000rpms. This is usually a problem with high mileage or older diesel vehicles. Centrifugal advance comes in at around 950-1000 RPM and is all in by 2000 RPM. Acting above 2500 RPMs and up to 5000 RPMs until i can’t hear it. Finally had enough of the crap from the dealership, de-catted, supertrapp fatshots, fuel-moto breather, and a power vision tuner later and still have some ping every now and then. If you found this post, you are likely looking to tune your Nissan/Infiniti (probably a Maxima or Altima). the smoke could be caused by carbon breaking off but would not be every day probably. Avoiding engine knock. Almost as soon as the piston gets to the bottom of the bore on the intake stroke, the valve gets slammed shut so no air can escape as the piston begins to travel back up the cylinder on the compression cycle. Today, I checked/set the timing using an adjustable timing light and digital tach. This codes are used to request data from a vehicle, used as a diagnostic tool. Low rpm and heavy throttle is the condition at which knock (detonation) does occur. ; Engine misfire - poor air/fuel mixture in the cylinders can cause an incomplete combustion event. Bobby's Simmonds load May 31st, 2017. My Lancer jerks at low rpms Lately I have observed jerks when I in the third gear or fourth gear and at low speeds (30-40 kph). Toyota engine has a bunch of vacuum hoses. 2; engine pinging when riding in town during hot weather (80F). >breaking a little harder than normal both times causing the RPM's to go >down. a car has 4. An electrically-assisted turbocharger (both exhaust gas driven and electrically driven) allows the boost pressure to be independent of the engine operation. Sometimes, with the A/C running, the engine would drop RPM to below 500, shake as if it were stalling, disengage the A/C and build up to 500RPM. If it happens at moderate RPM levels then you can probably fix it with the advance springs. i have VW jetta 2. When starting an engine its effective RPM is quite low, around 200RPM or so. Not big deal since the engine is at low rpm and under load. The Alfa Romeo 4C’s almost-1750cc engine is an absolutely amazing motor, wild and loud and immediate. When you start the car from a cold start it'll idle in the low 800-900 rpms, rev up a few times into 1100-1200 then idle fine at 1000rpms. A device, usually a centrifugally activated weight control balanced by a spring, advances the timing proportionate to engine RPM's. 1200 F, since at say 3000 rpm a constant amount of water is flowing through the engine (assuming thermostat is open) regardless of internal temp. does the car have a timing adjuster or chip and does it do it in all the gears or just one ? mines does it in 5th under 1500 rpm if it`s real bad don`t drive the car it sounds like detonation and can destroy the engine. I think your pinging problem can be explained by your comment above. the car was serviced including spark plugs (bosh) and an air filter replacement. The best way to describe car engine knocking is an annoying pinging sound which comes from the engine area. It also has what seems similar to a miss at idle, especially in gear. Or run it up a hill, again in 5th gear at low rpm, you should also hear a loud ping. Had to keep rpm's well above 3000. Engine knock/pinging on 2016 2. The engine has excessive timing advance for the fuel that is in it at the moment. 19 : Failure In PCM Internal voltage. A faulty camshaft sensor may cause a lack of power and erratic engine running. This causes the valve to resonate and rattle LOUDLY at 2200 RPM. First ask a helper to press the accelerator to increase the engine speed slowly to about 1,000 rpm, then let it drop back to idling speed while you note the reading. The engines tune calibration either needs to be changed or the fuel octane needs to be increased. 1500 rpm is high idle and your engine is barely making power. 3 could feel sportier as it wound higher. But I do not need to floor to make it ping and it will be in low and in high rpms. Is that basically what pinging sounds like? It started happening this morning, only seems to do it around 1100-1300 rpm with very light load at 35 mph. On early V-8s, low rpm/high load maps cause the engine to ping and activate the knock sensors which scale back the timing and reduce power. What can it. engine pinging I had the pinging going on in cool weather (65) but at the same speeds and rpm as the others in here. Horsepower differences shown result from differences in test rpm, allowable test tolerances, and/or installation of special kit components. Bobby's Simmonds load May 31st, 2017. This should go away quickly and if you sustain the throttle usage and changes it will stay away until you get comfy cruising again. If you have no choice but to buy a poor quality or low octane fuel back off the throttle and run with low rpm engine speeds. For me, that would be between 2000-5000 rpm depending on the situation. due to very low engine speed (probably 150-350 rpm). You might try a set of. 4 A special procedure must be followed to check or adjust timing. If it happens while accelerating, engine speed 2,000-3000 rpm, then that is probably it. That is why engines with too much spark advance or too high of a compression ratio, run flat at high rpm. Light pinging will definitely be occurring on every cylinder firing. Let me try to explain what it is doingas you are pulling out from a stop normally and the truck is going thru the gears (automatic transmission) every time the tach reaches 2200-2300 it rattles/pings and as soon as it gets above that it stops till the next gear reaches the same rpm. Low fuel pressure could be caused by a faulty fuel pressure regulator, a defective fuel pump or a clogged fuel filter. 5 to 1 compression engines. Never had an overheat condition. As said in manual: Your Yamaha engine has been de- signed to use premium unleaded gaso- line with a research octane number of 95 or higher. As a result, A clogged converter is the most common cause of exhaust back pressure buildup. Then the threshold seems to drop to almost 2,000 rpm. Any suggestions on the cause of anything I can do to alleviate the pinging? Thanks, Mark. View 3 Replies Similar Messages: Ford Excursion :: Pinging / Spark And Knock Under Load At Higher RPM; Toyota - Corolla :: 2001 - Loud Spark Knock / Engine Pinging Noise Under Acceleration; Ford Ranger / B-Series :: 1997 XLT 3. if you want to make sure its not a vacuum leak check your hoses for any hissing noises and the intake manifold. I'm going to go with it wasn't real detonation, maybe something else like an exhaust leak / crook engine mounts / something else. 4th gear at 1500-2000rpm) pinging is not good for an engine so i would like to fix this asap. This will sound: - briefly when traveling at average speed and applying throttle at low RPM just before the AT grabs a lower gear and the RPMs shoot up again. 14 : PIP Circuit failure. There are several possible causes of pinging. what the hell is causing pinging at a higher rpm when its supposed to be caused by too advanced timing in a high gear at low rpm (i. Finally, at 20 degrees, the pinging disappeared, along with most of the performance. DIAGNOSIS First, do not confuse engine ping with a mechanical failure that produces an internal knock in the engine. I was putting regular 87 octane gas, then i tried to switching to 93 octane premium. This causes the valve to resonate and rattle LOUDLY at 2200 RPM. Low-end torque was good for an engine of its size, but it had a fairly low redline; the 3. The Situation is, that IT starts to ping, when its warm. - at about 3000 rpm the trans. The dealership said they didn't hear it, and then they said it was normal. " Technigas "Next R" 100cc exhaust Home made 26mm intake 21mm Polini CP Carb. The fact that it goes away at higher RPM could be due to higher oil pressure, and depending on what is the original cause of the sound, other noises could be blocking it out. 5PSI (300 KPa) = 60lb/hr / 12. Seemed like the most obvious fix, since the truck ran fine above 2500rpm or if I. There are (in my experience) two types of ping. 0L strokers is pinging. Recently we took a trip towing a campertrailer weighing about 700kg, and during the trip we had to do a bit of hill climbing, when I noticed that the engine noise changed and there was a rattling sound similar to the "ping" in a petrol motor. I am wondering about using a heavier grade of oil and/or an additive to try to quiet this down. Dealer says it's functioning as designed. Most Airhead engines have a potential pinging "zone" from idle rpm to maybe 4,000 rpm. For example, let’s pick a specific engine operating point, 4000 RPM, WOT, 98 kPa MAP. You asked why some engine builders set up crank trigger ignitions with fixed timing. Pelican Parts Forums > Porsche Forums > Porsche 911 Technical Forum: Pinging at High RPM when Hot. "Pinging" in a gas engine is a result of the air/fuel mixture igniting prematurely, due to the heat of compression (in the case of excessively low octane fuel), over-advanced ignition timing or ignition caused by contact with superheated carbon deposits in the engine. If I raise it full throttle it would. Now I notice it (only with the windows down) when coming off a light right when the engine passes 1500 rpm. 2 gallons left to refill it with premium. A buildup of lime and rust deposits in the head and block can also reduce heat transfer. Do diesel engines ping like gassers? Fuels & Lubricants. Rattle/pinging noise at top end from mid to high RPM (under load, hot) detonation Knocking noise from bottom end from midrange or specific RPM, accelerating or decelerating, primarily at idle OR hot under a load at idle to midrange. Car has 195,000k, engine started to ping at all ranges and has gotten quite bad, also has a sharp shriek/shrill noise when RPMs are around 2,100-2400. Ping at high rpm (upon high load acceleration) Ping at low rpm (while cruising at a low rpm, especially in overdrive) Each type of ping has a different fix Keep in mind that the sound of ping is the sound of your engine self-destructing. For the MIVEC engine output is 273 PS (201 kW; 269 hp) at 6000 rpm and 304 N⋅m (224 lb⋅ft) at 4500 rpm. The Eaton modified roots type supercharger is the one that is best suited for the Toyota 3. If you have no choice but to buy a poor quality or low octane fuel back off the throttle and run with low rpm engine speeds. This noise is not present when I accelerate harder- it does it mostly when I back off the throttle but still accelerating. Engine is pinging/ticking/clicking on steady throttle in the 2500-3500 RPM range. THe engine makes sounds like it revs up a little then comes back down also while driving around 30MPH the car starts like bucking and sounds like its surging too under very light acceleration. It idles like glass and is WELL maintained. Whatever you do, don't put engine flush in a sludged engine! We call it "Instant rod knock" because of the way it overloads the oil filter to the point of opening the filter bypass valve, flooding and destroying the engine. 87-91 is all have. Reply; John June. Crankshaft or camshaft sensor has no output signal. Aluminum melts at approx. Re: Low RPM Exhaust Rattle (1st & 2nd Gear)??? « Reply #10 on: August 13, 2008, 02:56:17 PM » I have the same issue at low RPMs when just trying to roll forward slowly at times, or accelerating slowly from a stop, and it sounded like a chain drive stuggling to me, but now that you say it I guess it is an exhaust rattle. Has anyone experienced an engine knocking or pinging at low loads? Like at highway speeds 45-65 mph on flat ground. 18 : IDM circuit failure/ SPOUT circuit grounded. Also called spark knock, preignition or detonation. Overheating, too much advance in the ignition, too low octane gas being used, among a few other things. Problem is a ping below 1500 rpm, engine hot,light load going mostly up hill or light acceleration. Most of the time the cause is an worn lifter or ineffective lubrication due to engine oil deterioration,temporary or permanently low oil pressure (possibly from worn bearings),dirty oil, faults in the engine block tunnels, worn or faulty lifter buckets, high rpm when the engine is cold, softened valve springs which needed replacing. 5PSI (300 KPa) = 60lb/hr / 12. Coming back from the dealer the car seems to still be pinging with the clean and spark plugs replaced. You likely have a valve-train issue. Or you and your buddy tried to tune it yourselves and now ready to take it to a professional. Problem is a ping below 1500 rpm, engine hot,light load going mostly up hill or light acceleration. If I just drive easy - no pinging. Quite to the contrary after some months of low geared winter driving this Italian car definitely needed such an ITU. The pinging goes away when the car get's warm because the knock sensor is only active above a certain engine temp(at least that what I've read). Perhaps there is an imbalance in the air to fuel mixture, resulting in the gas burning unevenly. Check out how we eliminate knock retard on a 1987 Buick Grand National and get a few more ponies too. Tear down engine/diagnose or replace engine. I just take it easy on those days, and try not to lug the engine. We're using high octane fuel. I'm going to go with it wasn't real detonation, maybe something else like an exhaust leak / crook engine mounts / something else. Mine is over 100% VE, as many of the little SBF's I've built over the years have been, but idle vacuum is pretty sorry. Too lean and the engine will go lean in transition, and often get the piston so hot it will expand and begin to seize on the sleeve. Many street engines are deliberately built with a late-closing intake valve to bleed off cylinder pressure at low rpm to stave off detonation. If the RPMs are too low for the given speed and gear then yes, you can damage the engine. The torque peak of most 2stroke racing engines is a few thousand rpm below the horsepower peak. Hope this helps. the idle is normal but pings with light throttle at 1200-1900 rpm cruising speed. If i had to guess it is pre-ignition pinging. It's general rule that if a car is rated for 87 octane, then any higher is just throwing money away. 2) Low speed Needle Valve (NV) setting - I have seen engines come from the factory with this needle as far as 4 full turns out. If it happens while accelerating, engine speed 2,000-3000 rpm, then that is probably it. When engine temperature is between 60*-80*C, it pegs at "3" at about 1200 RPMS. Horsepower differences shown result from differences in test rpm, allowable test tolerances, and/or installation of special kit components. Troubleshooting Pinging in Stock engines. then there is a maximum to the amount of heat the water can absorb while it passes through the engine. Thus, mechanical timing advances are used. I wanted to make a thread to make sure you guys are aware that this is HORRIBLE for your engine. Pinging/pinking is ALSO quite affected by ignition timing and piston speed, gasoline octane rating, and altitude (particularly carbureted engines), and is one of the several reasons that car engines generally have an automatic ignition timing device that is. I have only been using 91 octane 76 gas so that shouldnt make any difference. Moderate Ping: Engine Ping which is “more regular and almost pings to the rhythm of the rpm”. The manual states 5000-6000 with 5500 peak, so I realise it's not out of spec just low The concern was more around stall at idle when moving in gear and the lack of effect the spark advance screw has. Injector Specs: Static Flow Rate @ 43. I replaced the dpfe again and no difference. You pour it in slowly for the first 2/3 can, holding the throttle open slightly to keep it running, then dump the last third in, trying to flood the engine. Low fuel pressure could be caused by a faulty fuel pressure regulator, a defective fuel pump or a clogged fuel filter. Low rpm performance will be good, but the thing will ping like crazy, and you'll break something eventually. lots of low end. On the left side of the engine, toward the front, and just below the cylinder head, is the block's serial number. Check them first. Engine designers use the term called MBT ( Minimum spark for Best Torque) for efficiency and maximum power; it is desirable to operate at MBT at all times. If the ignition spark occurs at a position that is too advanced relative to piston position, the rapidly expanding air-fuel mixture can actually push against the piston still moving up, causing knocking (pinking or pinging) and possible engine damage, this usually occurs at low RPM and is known as pre-ignition or in severe cases detonation. If this were my engine I would start out with around 10° in the topleft corner of the map and ramp it up to 20° at around the center (3500rpm) of the table on the 2-3 top rows. If you haven't blown the engine, then the spark plug will fail. If the timing is too far advanced, the spark itself can cause the pinging. I have a US Titan Velocity MP150-08 with a 147cc GY6 engine, numbered HS1P57QMJ. hello gents; i have been hearing a pinging/knocking sound from the engine,i have read 3 pages of multiple threads,and all of the threads concerning this issue. Essentially, centrifugal force moves the weights outward against the tension of the springs. The default is 10,000 rpm. If I tune it to no ping, I only get about 38 mpg. Ok I have a 4 year old Wright 36" stander with a Kawasaki 18. Engine pinging also refered to as pinking, detonation or knocking. second - my problem. Of those two times, 1) Freeway: engine stalled when I pressed >the gas, but kicked back in 2) Surface Streets: engine stalled >completely, but I turned the key and started right back up while still >rolling. For instance, I recall my 4. Enter the engine displacement size for the designation. i get weird knocking/pinging sound. The truth is, under moderate to high loads consistent knock counts can cause catastrophic engine failure, usually in the form of crushed rod bearings, cracked ringlands, or a hole in your piston. If you don't have a vacuum gauge, use a low-speed tachometer. If the engine is too hot or the fuel has too low of an octane rating, pre-ignition can cause the pinging. 4l has a pretty decent ping when i start traveling up decent size hill, but still in Overdrive at a low'sh rpm. WOT at low rpm is where pinging most often occurs. milliseconds depending upon the engine rpm and engine type. pinging or knock is usuaualy related to a timing problems or bad fuel. I imagine until oil reaches somewhere (lifters, valves, something). and there it has very slight pinging only at low rpm, (below 2000rpm"). Past week its gotten louder to the point i can easily hear it when speeding up, though it seems to go away after driving for a bit (maybe 5-10 minutes). low end ping can often be caused by either overly advanced timing, or carbon deposits on the pistons, which themselves are caused by the incomplete combustion of fuel. mercedessource Tech help - Diesel Purge can help you isolate the noise Internal engine noises can be very difficult to diagnose. Engine Ping or Knock at low load. I have that same tic sound in my engine. Possible culprits could include too low octane fuel, maladusted timing and carbon deposits in the combustion chambers. For diagnostic purposes advise using 1 - 2 tankfuls of a name brand / different source of diesel fuel to determine if the concern is caused by a fuel quality issue. The dealership said they didn't hear it, and then they said it was normal. Later exhaust valve opening helps low rpm performance by keeping pressure on the piston longer, and it reduces emissions. This is true up to approximately 2,700 to 3,500 RPM's. It has however suddenly developed considerable knock at higher RPM's. There are (in my experience) two types of ping. However at about 1800 to 2000 rpm then engine sounds a bit harsh, like a resonance type noise. THAT I have heard at really low RPMs on a hot day under heavy load. Check them first. Gauges would zero out when accelerating from a low RPM. The low speed hesitation could also be attributed to the inherent bad fuel/timing maps built into the ECU from the factory. Among them: Fuel octane too low ; Fuel octane is a measure of the ability of the gas to spontaneously ignite. Severe pinging at low RPM! Diagnosis, anyone? GM_Guy Posting Addict Registered: 12/17/00. Then the engine revs well with the higher Rpms, and no 'ping. The engine did heat up about 3/4 on the temp gauge due to the radiator being pretty low but it did not overheat. Pistons and/or valves will burn out if operated for extended periods under pinging or pre-ignition conditions. Also called spark knock, preignition or detonation. Gallons / hour. The wet head is not an oil head. Caused by either a lean. Low-speed pre-ignition (LSPI), also known as stochastic pre-ignition (SPI), is a pre-ignition event that occurs in gasoline vehicle engines when there is a premature ignition of the main fuel charge. 4th gear at 1500-2000rpm) pinging is not good for an engine so i would like to fix this asap. Cruising around at 20-25, the truck is usually at 1000-1500 RPM when the road starts uphill. High rpms detonation is not as strong, more like short bursts. It also does this sometimes during hard acceleration. The second generator provides the signal that serves as a. Thus, mechanical timing advances are used. Drop a gear and it goes away. Low Compression Low compression in your diesel engine will prevent heat from being produced to ignite fuel and causes hard starting. Engine pinging also refered to as pinking, detonation or knocking Pinging can be anything from a loud knocking noise to a soft tinkling sound that is emitted from the engine. Pelican Parts Forums > Porsche Forums > Porsche 911 Technical Forum: Pinging at High RPM when Hot. Among them: Fuel octane too low ; Fuel octane is a measure of the ability of the gas to spontaneously ignite. You can essentially recurve the distributor without a machine. ), oil changes every 3k miles. Generally, there is a large signal at high engine rpms and lowe r signals at low rpms. can advise?. 3 Measure using an accurate service tachometer with engine at normal operating temperature. They are not supposed to operate under that much pressure. Upto a maximum rpm limit of approx 1,800 rpm. —to severe overload and creates a pinging or knocking sound. I have a US Titan Velocity MP150-08 with a 147cc GY6 engine, numbered HS1P57QMJ. does the car have a timing adjuster or chip and does it do it in all the gears or just one ? mines does it in 5th under 1500 rpm if it`s real bad don`t drive the car it sounds like detonation and can destroy the engine. "Engine knocking" means abnormal banging, knocking or pinging sounds coming from your engine because of abnormal combustion of the air-fuel mixture. Check plug wires for any breaks as well as insuring tight fit in the coils and spark plugs. Air trapped in the cooling system, from improper bleeding can cause hot spots in the engine. 8 produced 150 horsepower at 4,400 rpm — the same as the 3. For instance, low power at 60 mph (2500 rpm) in top gear may have one or more of several causes: The exhaust system may not work well at that rpm, the cam design may not work well at that rpm, the ignition timing could be incorrect for that rpm, or, --- the carburetor could be set too lean or too rich at that throttle opening. Overheating, too much advance in the ignition, too low octane gas being used, among a few other things. I've recently purchased a Q7 3. Pinging at Low RPM I purchased a 2006 RC Ram SRT-10 with 87,000 miles about a month ago. (See photo, next page. and I think the parameter is 950 -1150 RPM. Re-torqued the header’s nuts. I also get a little pinging now and then. It will restrict engine airflow; causing the engine to run hotter and lose power; leading to pinging or knocking. The fact that it goes away at higher RPM could be due to higher oil pressure, and depending on what is the original cause of the sound, other noises could be blocking it out. 1993 Lincoln town car with 4. This is a car engine that has a ping. My theory is the ignition timing is dropping too quickly upon full throttle acceleration (taking off with my clutch, and putting load on the engine). Edit: You should be able to pull the advance weights out with your finger and they should snap back, but that really just a rough test. Car has 195,000k, engine started to ping at all ranges and has gotten quite bad, also has a sharp shriek/shrill noise when RPMs are around 2,100-2400. Consult your Authorized Mercury MerCruiser. When the engine is first started it idles normal. 96 Subaru EJ22 with hydraulic lifters engine knock. Under certain conditions, the check valve in the brass outlet of this pump may ‘cock’. According to Mercury Marine, the engine is a good fit for runabouts up to 19 feet, pontoon boats and fishing boats. engine pinging I had the pinging going on in cool weather (65) but at the same speeds and rpm as the others in here. I have a US Titan Velocity MP150-08 with a 147cc GY6 engine, numbered HS1P57QMJ. If this were my engine I would start out with around 10° in the topleft corner of the map and ramp it up to 20° at around the center (3500rpm) of the table on the 2-3 top rows. RPM drops by a predetermined amount. My electric pump was not up to the job so it was swapped out with a higher end pump. My bike is NOT stock. Now when I first did this my timing jumped all over the place. However, at wide open throttle ( WOT ), an internal governor forces an upshift just below the engine's redline, or about 6500 rpm. Premium fuel is recommended for the VQ35DE engine in your Max. I was putting regular 87 octane gas, then i tried to switching to 93 octane premium. OTOH, the same 1. With that said. Welcome,. View 3 Replies Similar Messages: Ford Excursion :: Pinging / Spark And Knock Under Load At Higher RPM; Toyota - Corolla :: 2001 - Loud Spark Knock / Engine Pinging Noise Under Acceleration; Ford Ranger / B-Series :: 1997 XLT 3. So, back in the day GM with carbed engines running HEI ignition, we would kick the timing up to the point where the engine would ping under acceleration and then we'd back off the timing until the ping went away for hotter ignition. At lower engine loadings during part throttle or low RPM, detonation may be warranted. A tuned engine generally is not designed to give good performance below 2500-3000 RPM and indeed below this level, the volumetric efficiency of the engine is seriously affected. 2:1 compression and I. I was not able find any vacuum leaks. Regarding your pinging, the most common (by far), cause is a vaccum leak. That is one of the reason you should avoid lugging these engines. Cylinder Pressure Low High. On early V-8s, low rpm/high load maps cause the engine to ping and activate the knock sensors which scale back the timing and reduce power. A defect in the cooling system can also result in engine ping. Under certain conditions, the check valve in the brass outlet of this pump may ‘cock’. It sounds as though a handful of marbles were dropped into your engine and generally occurs under hard acceleration under load. When tuning periodically bump the accelerator and verify vacuum. The pinging happens usually at 2400-3000 rpm under a load which is right around 1/4 throttle. It needs to learn. When engine temperature is between 60*-80*C, it pegs at "3" at about 1200 RPMS. A higher octane would be a helpful to rid the engine of pinging, as for the water pump remove the radiator cap ( engine cold) and drain off some anti-freeze until you see the vanes inside the radiator. The engine did heat up about 3/4 on the temp gauge due to the radiator being pretty low but it did not overheat. For example, during the late '70s and '80s, pinging during normal operation was common with carbureted engines. For example, my neighborhood is very hilly. Initial+centrifugal timing is 25 degrees at 2000. Eventually, this could lead to a failed head gasket, broken rings, cracked piston lands and/or flatten your rod bearings. while running whether the auto transmission is engaged or not its having a dip in engine RPM accompanied with a change in the engine sound while standstill. Very hot days definitely will have the engine pinging if a slow lazy take off. Worst case scenario: you're looking at costly, if not catastrophic, engine damage. This is usually a problem with high mileage or older diesel vehicles. At the lower rpm, the integration period may be extended to gain more samples and effectively produce high sensitivity to obtain more output. This resistance is used to prevent high current damage to the coil at low engine RPM. If that does not get the bike idling you may have either a blocked idle jet in the carby or low fuel levels in the bowl. This may vary based on the age of your engine and conditions, ect. In a very loose sense diesels do "ping" all the time. This may be caused by using gasoline with an insufficient octane rating, carbon buildup within the cylinder itself or improperly functioning spark plugs. Easing up on the accelerator or downshifting to 4th made it go away. On race cars, we aren't really loading the engine at low rpm, so the vacuum system is eliminated. Turning the idle speed screw clockwise will increase rpm. If pinging is occurring, back off the distributor advance setting. Run as few RPMs as possible. Got a load whirling sound front of engine at 2500 rpms and higher help 103 2012 blackline. If you put a stock cam in the engine, it would probably ping like crazy at low RPM. I think your pinging problem can be explained by your comment above. At the lower rpm, the integration period may be extended to gain more samples and effectively produce high sensitivity to obtain more output. : Hi All! Fist - sory for my english. oh ya, i did some carbon clearing last wednesday, rpm 3k - 5k for 15-20min. does the car have a timing adjuster or chip and does it do it in all the gears or just one ? mines does it in 5th under 1500 rpm if it`s real bad don`t drive the car it sounds like detonation and can destroy the engine. any advice. Mine is over 100% VE, as many of the little SBF's I've built over the years have been, but idle vacuum is pretty sorry. I started pinging so we switched to premium gas, but it hasn't stopped. But I do not need to floor to make it ping and it will be in low and in high rpms. Finally, at 20 degrees, the pinging disappeared, along with most of the performance. I'm hearing a knock/ping when my car is idling, but when i rev in higher rpm i don't hear it. So that's why I've stuck with Esso lately. Excess pinging, especially under moderate to heavy acceleration, can damage the engine. Engine designers use the term called MBT ( Minimum spark for Best Torque) for efficiency and maximum power; it is desirable to operate at MBT at all times. 15 : PCM Read Only Memory (ROM) teat failed. With that said. Obviously at high rpm this is good for maintaining power since the short rod engine would have the piston halfway down its stroke in no time (no push)! Conversely, the short rod engine at low rpms and high loads will not ping and the engine has "leverage" to spin the crank, where the long rod engine "stalls". On race cars, the engine spends very little time at low rpm, so many times the vacuum-advance system is eliminated. Check and see if you have any codes set, and try another carbon treatment. I have a 65 corsa that is surging at lower rpm's. Spark plugs are the "window" into your engine (your only eyewitness to the combustion chamber), and can be used as a valuable diagnostic tool. There are lots of reasons as to why there would be engine knocking. The reason is rather technical, but is mainly related to the amount of residual exhaust gases which are left in the cylinder compared to the incoming charge. Are you running premium fuel? The VQ is designed pull the timing in the case that lower octane fuels are used in order to protect the engine from knock and ping, but if low octane fuel is used it may ping. An electrically-assisted turbocharger (both exhaust gas driven and electrically driven) allows the boost pressure to be independent of the engine operation. It’s not all bliss however: In high gear there can be a loss of power (at higher engines speeds) if there is too much timing. Use the most vacuum advance you can without part throttle pinging -1 deg and you'll be good to go. and I think the parameter is 950 -1150 RPM. The truth is, under moderate to high loads consistent knock counts can cause catastrophic engine failure, usually in the form of crushed rod bearings, cracked ringlands, or a hole in your piston. I think the issue is due to both the high compression of the motor in conjunction with the honda tune for the latest emissions rules eg: very lean at low rpm. You’ll also gain throttle response, which is important down low. The engine is run for two intervals of 15 minutes each, and every possible issue is addressed. If the engine is emitting white or blue smoke, this means your engine is burning oil. Quite to the contrary after some months of low geared winter driving this Italian car definitely needed such an ITU. Solution, changed brand of oil used in the engine from Valvoline to Royal purple or Nissan Easter oil 5w-30. Thus, mechanical timing advances are used. The second way is to use the Power Boost spray from Ekotec or sea foam. shifting to the 4th gear. First ask a helper to press the accelerator to increase the engine speed slowly to about 1,000 rpm, then let it drop back to idling speed while you note the reading. Enter the engine displacement size for the designation. As we’ve come to expect from Harley EFI, the throttle control is precise, smooth, and without a hiccup, no matter the riding conditions from huffing along at low rpm to aggressive riding. I tried the usual stuff like try different gas brand and fuel treatment not working. There are several possible causes of pinging. A slight knock develops in the 1800-2400 RPM range at low loads. If that doesn't help, you need to address carbon deposits or the quality of fuel that you are using. Engine Knocking - Pinging - Rattling Noise - Common Causes Is your engine making an annoying knocking, pinging or rattling sound when you accelerate. This noise is not present when I accelerate harder- it does it mostly when I back off the throttle but still accelerating. I have an 07 with about 15k miles. One engine may need the timing curve to advance more quickly at low RPMS as then level out at higher RPMS where as another might need the curve to clime more gradually through the whole RPM range. It would depend more on load than rpm. The low end power was great but it would lay down at high rpm. Traction: Lower RPM means more traction because there are less power pulses per revolution of the rear tire. >breaking a little harder than normal both times causing the RPM's to go >down. It idles like glass and is WELL maintained. Cruise low if you want, but downshift before applying power. Crankshaft or camshaft sensor has no output signal. I also get a little pinging now and then. I have an 02 with 60k mi. Due to the low speed of engine: Due to low engine speed, Pinging in an engine is the result of the air and fuel mixture within an engine cylinder igniting incorrectly. The O2 sensors were recently replaced but when the pinging occurs an O2 sensor code is thrown. The manual states 5000-6000 with 5500 peak, so I realise it's not out of spec just low The concern was more around stall at idle when moving in gear and the lack of effect the spark advance screw has. The usual cause of engine ping is over advanced ignition timing, an inoperative EGR system or improper fuel usage. 1200 F, since at say 3000 rpm a constant amount of water is flowing through the engine (assuming thermostat is open) regardless of internal temp. The angle should remain about the same, with no more than two or three degrees deviation. have it checked epsecilay if you can feel it in the engine compartment. Stalling at low rpms? How low? The 2F is a damn torquey engine, it rivals a diesel for low rpm torque. The faster the engine runs, the more timing advances. Idling in gear RPMs go way down and idles rough. I did two consecutive fuel injector additive treatments, problem went away. Been going over it every chance I get and trying to get it in tip top shape and fixing everything I can find wrong with it. Its SUPER common for 5. In tests with a 1. In any case, make sure there is no pinging or pre-ignition anywhere on the rev range. The Mitsubishi models were with a 3. For example, my neighborhood is very hilly. BMW’s Turbosteamer. Electric pumps are pushers and not good at suction. JA90 Adly 96cc 2T ATV engine (Hoca 54mm) Polini adjustable two-shoe clutch 5g roller weights Home made Modified Hoca vari "Mini O. Worst case scenario: you're looking at costly, if not catastrophic, engine damage. The low end power was great but it would lay down at high rpm.