9-Liter Cummins Engines are used in many applications including step vans, uniform and commercial delivery vehicles. What do you think it is? This happens in park neutral and in gear. t at 3500 rpm. If the engine is too hot or the fuel has too low of an octane rating, pre-ignition can cause the pinging. SYMPTOMS OF INCORRECT IGNITION TIMING Symptoms of incorrect ignition timing are poor fuel economy, sluggish acceleration, hard starting, backfiring, or "pinging" or "spark knock". it is 2011 Toyota camry 4cyl with 60k miles. Two stroke engine failure, engine ping, low octane fuel causing piston detonation. Also I tried different gas shell, Exxon and BP. 2L EcoTec with 145k on it. At low rpm, the ping sounds more like a solid knock. Engines designed with timing gears, or those equipped with a timing chain and sprockets, can produce different noise. I usually ran 4000-5000 rpm. Solution, changed brand of oil used in the engine from Valvoline to Royal purple or Nissan Easter oil 5w-30. My car is making loud knocking noises at idle. The 2009 Ford F-150 has 12 problems reported for engine clatters like a diesel at low rpm. In engine families that have an interchangeable cam, such as the 290-401 AMC V-8, a cam that's smooth and docile in a 401 might turn a 304 into a low-rpm gutless wonder. Repeat steps 4 and 5 as necessary. I don't think I am driving the car to low on RPM, since I usually drive uphill around 2. Effects of engine knocking range from inconsequential to completely destructive. Ls 430 Pinging At Low Rpm Sign in to follow this. As you probably have already figured out, detonation (aka "knock") is a big issue in the world of forced induction. two different speeds based on engine load. ) The Prius engine is not high compression, nor would I expect the ICU to allow it to ping/knock even with bad gas. I know with my 98", when I started picking up the RPMs, pinging went away. The computer system is supposed to compensate for lower octane fuel and the manual does not state you must use High test octane gas. I had to pick up my dog and needed the murano - planned to keep the engine load low to avoid pinging. we've been getting knocking/pinging from the engine since it was fairly new. Ping Timing Ping - the name given to the sound made by pre-ignition, or detonation, also called spark knock, sounds like marbles rattling around in your engine. At the recommended treat rate, it does not harm catalytic converters. I run the best gas I can find and octane booster. It hesitates to a point where it is a safety issue. ESC is used to sense spark knock (pinging) and retard the timing to eliminate it. This can result in detonation which produces a pinging or a knocking sound. When the idle is low, I get pretty decent power throughout all RPMs. On race cars, the engine spends very little time at low rpm, so many times the vacuum-advance system is eliminated. Pinging seemed to go away for a short time then returned. Was pinging during light acceleration from 60 to 70 much worse than before. Plugging the vacuum advance back in gives me 29 degrees of timing at idle and 45 degrees of timing at 3000+ RPM. This 900SS (SL actually) had had an engine rebuild elsewhere and had been fitted with JE high comp pistons due to the cost of original ring sets. My Santro Xing 08' has this problem where the engine starts jerking at low RPMs, This usually happens when the engine is cold, This happens when the car is in motion and the throttle is pressed a little in the first gear and just after releasing the clutch after engaging 2nd gear. 89 F150 stalls at idle / low RPM's. we've been getting knocking/pinging from the engine since it was fairly new. I ONLY hear the ticking during acceleration or when the motor is under load. I recently started hearing a stuttering noise, like a prop plane or a car engine when it's "dieseling", when I start the engine and also when I turn it off. thanks in advance to any help!! oh and i also changed it from normal to economy if that matters. The rotten eggs is the CAT's death. Stop the vehicle, turn off the engine and connect a timing light to the battery and number 1 spark plug wire. It seemed to run great, didn't bog, backfire or ping when going uphill at a low RPM. 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 was able to get some pinging under load around 3-500 rpm but it seems intermittent at best. t at 3500 rpm. Almost a sound of marbles rattling around would also describe the noise. pinging or knock is usuaualy related to a timing problems or bad fuel. It's pinging like crazy with 20° advance at high load and low rpms. The damage can be severe, in an engine that does not have anti knock sensors and computer controlled ignition timing- But on the. The engine rpm's get low enough to dim the lights and almoist stall the engine. Gasoline engines run an aggressive spark advance curve and rely on EGR to prevent engine ping. While on one of the uphill climbs, the trucks check engine light started flashing and I heard noticeable pinging. Apart from running with no oil, the engine ping/knock is probably the second worst thing that can affect the longevity of an engine. From what I understand, it seems to activate when cruising (I'm reading that as low RPMs). 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. The pinging was horrible - especially on an uphill freeway entrance ramp - had to shift to S to get the RPMs up to avoid pinging under any acceleration. I Idle around 500 most of the time and lately the idle has been up to 850 rpm at a intersections. With timing set At 8 degrees before TDC and idle adjusted to 650 motor runs goodon low and mid range. I have never used. This noise is caused by an air/fuel mixture in the engine cylinder being ignited prematurely by the heat of compression as the piston is moving up on the compression stroke. On flat ground, I can let the clutch out at idle and not kill it. i changed my plugs using the original plugs and same problem so changed to the original plug but a colder version of the plug and same problem. If the timing is too far advanced, the spark itself can cause the pinging. The detonation can prove to be fatal as well and will require you to rebuild the engine. Seems like a simple question. Production engines are optimized for the type or grade of fuel that the marketplace desires or offers. Example: Pulling a loooooong steep hill. P0135 or not, change them. It is usually caused by too lean a mixture or a fuel rated low in Octane or performance number. You haven't mentioned how old/ how many miles your engine has done. “They had identified an issue with direct injection turbocharged engines, which they called low-speed pre-ignition. its done nearly 300,000ks. Exhaust Back Pressure Starting with the engine at idle, slowly increase engine speed to 3,000 RPM, engine vacuum should be equal to or higher than idle vacuum at 3,000 RPM. Many people with the dreaded pining problem have tried this and it has in some cases eliminated the high gear, low RPM ping. Low Load Low RPM Ping But No Knock Retard. I have been told that my car is running lean at the higher rpm range. Looking at the engine from the front, measure exactly 1 3/4" clockwise around the balancer, and make a second mark. This setup widens the rpm range where the reed valve flows best. Start the engine and check to ensure that you're getting adequate oil pressure and listen for lifter tapping. If you notice stumbling or sputtering, it can indicate a rich condition. Well the easiest thing to do would be to first fill it up next with a higher octane gas. 0 to set up for 91 octane. Low idle speed after start & engine pinging in hot weather after starting the engine, RPM goes up normally to 1600 RPM for 20 -30 secs but then falls quickly to. The fact that it goes away at higher RPM could be due to higher oil pressure, and depending on what is the. When accelerating from a stopped position the engine hesitates around 2000 RPM. This pinging problem should have been cleared during the ECU vehicle calibration. The low speed hesitation could also be attributed to the inherent bad fuel/timing maps built into the ECU from the factory. Test drive about 10 miles at different speeds. Post by Lazy JW » Thu Oct 27, 2011 1:27 am tom954x4 wrote: I think the difference in 'Bronco readings and Buddy's readings could also be due to the fact that 'Bronco has a heavier vehicle than Buddy's F-100 2WD and thus is placing the engine under greater load, with lower vacuum being inevitable at the same RPM. Most notably when taking off from a stop sign. The higher the compression ratio of an engine, the higher octane it requires to prevent pinging or (preignition). Vacuum in the carburettors is at it's highest point when idling or travelling at a constant speed with low rpm. My engine makes a rattling noise briefly when I accelerate hard under load -- usually from about 2000-3000 rpms or so in 2nd gear when driving around the neighborhood. At F1 engine rpms they can run fuel which would be unusable for your engine. It seems more like a pinging type sound similar to an older car engine. But I am speaking out of my bowels. You probably know that detonation is a bad thing, and that by adding a supercharger (or any forced induction power adder), you must take additional measures to avoid detonation, especially if your engine has other modifications. I checked my oil to find it really low, though the oil light never turned on, and the check engine light hasn't come up either. It only occurs while excelerating up hill around 50mph or so as it shifts into overdrive while at low RPMs. It isn't horribly loud, but it is an additional sound on top of the engine noise. I am running 91 octane, and the in-tank fuel filter was also replaced. "pinging". stock prop or not? if the engine is BRAND NEW or rebuilt brand new 7k is your goal, but 6800 is acceptable. Discussion in 'Issues, Repairs, Warranty, TSB, Recalls' started by bigriver, Apr 27, 2018. It isn't horribly loud, but it is an additional sound on top of the engine noise. So after I press the gas to compensate for speed loss, but before the downshift occurs. I've seen the shift interupt switch be a problem on an older 4. 7l Sign In 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?. Get course recommendations based on the results of the quiz below. The best way is to get your car dynoed so they can see the acual pinging. "My rebuilt twin cam filled with 20W-50 has no oil pressure at start-up, but builds pressure at higher RPM. I always do mine allowing the engine to spin through 10 rotations for each check, and preferably with the engine previously warmed up. Seems to happen at high ignition advance, no codes for the knock sensor. But when it is warm, not cold, I get a mild knocking sound when at the lower RPM range. And why jet engine has to have high rpm to be efficient ? Why these books always explain half way and stop, or only explain the end story within basic explanation? Not complaining but it isn't the first time lol:{:. RPM limiter is 7200ish. i changed my plugs using the original plugs and same problem so changed to the original plug but a colder version of the plug and same problem. At low RPM (above idle to approx 2500RPM) I'm getting a bucking or surging. You should hear a loud ping when either running at very low RPM under load try running in 5th gear at a low RPM and giving it some gas. Low battery Increase engine RPM by throttling If alarm persists have a dealer check the battery and alternator. Avoiding engine knock. Backing the timing down helps but doesn't completely eliminate it. jorton get your vin number and call the service advisor and ask him to check and see if their are any service bulletins out for pinging or computer program updates for your vehicle. The best way is to get your car dynoed so they can see the acual pinging. I run a Solas Concord 15/20 on mine, and it won't break 6,800, but the ski will do 64-65 MPH. Can someone tell me what RPMs at 40, 50, and 60 MPH a C50 has at those speeds. Be sure maf sensor is clean at the fine wires will cause ping and loss of power making it run to lean at certain rpm. For example, my neighborhood is very hilly. If I back off the timing tell it quits pinging and runs w. I run the best gas I can find and octane booster. 01-02-11 12:41 PM - Post# 2025792 In response to strictlygm To run well without EGR you need a custom chip/tune. An engine with timing too late (retarded) will have a low idle vacuum, have slow throttle response, feel like a turd at low RPMs and will run hotter than normal. 66" exhaust) than the 2V heads. Now it gets complicated. Spark pinging is not to be confused with regular pinging. It was truly shocking to think for a while that the high tech engine in this highly rated vehicle could actually do that. But it is very unusual for a stock engine to ping. I've verified the symptoms with a mechanical oil pressure gauge. If you put a really wild cam in it, the pinging wouldn't appear until a higher RPM. What could this be?. All engines are fitted with sensors which detect knock and retard the fuelling to prevent engine damage. If vacuum decreases at higher engine RPM's, an excessive exhaust back pressure is probably present. finally bring in the vacuum advance and test for cruise to part throttle pinging. Also the idle seems to wander a bit, sometimes just 100 or so rpm sometimes varying up to 400 rpm. , it pings if I try and get on it at lower rpm's. Idle is at 650-700, I've gone through all vacuum hoses. Before anyone tells me that the engines on his fast purse seiner was not the same as the engine under the hood of my pickup, believe me, I know this. have about 50000km on the odo. The only issue, at low RPM the engine is little, almost like a diesel. I wouldn’t call it a knocking noise, best way to describe it is what a fuel injection vehicle sounds like with cheap gas. It won't happen down hill because the engine isn't under load. 3l Duratec engine will have a Knock sensor, so you should have never had any Pinging/knocking, as it WILL damage the engine, eats away at pistons and valves, also eats away at head gaskets ring. What is pre-ignition or valve clatter?. HR engine pinging have about 50000km on the odo. If your engine pulls 15"Hg but your vacuum advance doesn't max out until 20"Hg then you may have an unstable idle. 2 Volts at idle, around a half a volt when cruising, and up to 1 volt at full acceleration. I've verified the symptoms with a mechanical oil pressure gauge. Plugging the vacuum advance back in gives me 29 degrees of timing at idle and 45 degrees of timing at 3000+ RPM. at low engine the engine’s measured torque by rpm and dividing by 5,252. This sound will generally be the same in intensity whether the engine is idling, operating at high speeds, or under load. Letting the rpms get into the low-2000 range when going up an incline is a sure-fire way to encourage an engine to ping. On many older two-stroke engines the spark voltage is very high (and not well regulated). 000 RPM, sometimes even more. t is reached and mainted for more than couple seconds started pinging real bad. Engine Overview. Certainly pinging on the Renegades is a very very rare complaint that I've seen. Low rpm operation is controlled by the intermediate jet (#11). Every wonder what that metallic rattling is coming from your engine or that your car sounds like it is dragging a chain behind it. What fails when the engine is running at a low rpm with an open throttle?. The mechanical portion of the 8. 1 was built to run 300,000 miles if all service intervals are met and the rpm's are not pushed. Exhaust Back Pressure Starting with the engine at idle, slowly increase engine speed to 3,000 RPM, engine vacuum should be equal to or higher than idle vacuum at 3,000 RPM. Add an oil-flushing solvent into your engine. and makes a rattling/pinging noise when it is trying to find. A local, unprivileged user could use this flaw to crash the system or, potentially, escalate their privileges on the system. com is the world's #1 site for vacation rentals. Opening the throttle calls for a downshift and raises the upshift point rpm via a cable attached to the throttle body. Gasoline engines run an aggressive spark advance curve and rely on EGR to prevent engine ping. stock prop or not? if the engine is BRAND NEW or rebuilt brand new 7k is your goal, but 6800 is acceptable. It goes away at higher RPMs. Give it a try, and you will likely be very impressed with the amount of pep you suddenly get. there is a pinging noise at low rpms or when going uphill. When warm the engine starts to knock for a second between 1500 rpm to 2700 rpm when I punch the accelerator, after 3000 rpm its fine and it pulls normally. it is 2011 Toyota camry 4cyl with 60k miles. GM > Engine > Spark Control > Spark Advance. If your engine is idling at 600 rpm (and therefore that is the crankshaft rpm), the sound will occur 10 times per second. I have a 2004 I35. If the engine really is pinging, take it to another dealer for a check. Engine Noise Under Load was created by druggernaught just wondering if you might be able to tell me a little more about this engine noise i am getting when driving the my 1990 Toyota Corolla 1. Third, it provides a more aggressing timing advance at low RPM, to improve low end torque. The dyno runs will never measure as low as 2000 RPM because it is inefficient and harmful to run the engine that low for the reasons stated above, the same applies in the opposite direction when revving the engine above 8000 RPM (which is why the ECU is programmed with a rev limiter, preventing that from ever happening). The noise is a high pitch ringing / tone that appears to come from the front of the engine near the belts. Start the engine and check to ensure that you're getting adequate oil pressure and listen for lifter tapping. My engine all of a sudden seems to have developed knocking on low RPM yesterday. 3L Vortec engine was a farmer in the Red River Valley of Minnesota. Getting the most out of the Dyna ignition requires the Stage 2 carb and exhaust mods. Hey, anybody got bad valve pinging or engine just sounding horrible upon hard acceleration top end rpm's? Mine didn't always do that , but it has the past 5,000 miles or so?. Pinging at 3000 RPM - stock CCT you can go as far as +8 degrees or as low as +8 degrees. If you notice stumbling or sputtering, it can indicate a rich condition. A stock motored 98-01 won't knock on 87. When it is over 100 it really acts up. Ign advance/timing also affects the idle. I checked my oil to find it really low, though the oil light never turned on, and the check engine light hasn't come up either. I've been experiencing "pinging" for a couple of weeks now. Mine will happily chug along at 5-600 rpm. This is because the overly lean stock A/F ratio will ping if the timing is advanced. with a test engine running at 600 rpm, which represents a low-compression. 89 F150 stalls at idle / low RPM's. com is the world's #1 site for vacation rentals. 3l Z71 140k miles. Be sure maf sensor is clean at the fine wires will cause ping and loss of power making it run to lean at certain rpm. How is the FE? Check the timing also. I had just made it to the top of the mountain and the valves started pinging for the first time. I have put in new spark plugs, wires, coil boots, o2 sensors about 4,000 miles ago. My thoughts about engine rpm and how lugging your motor too often can eventually cause problems for your bike. SYMPTOMS OF INCORRECT IGNITION TIMING Symptoms of incorrect ignition timing are poor fuel economy, sluggish acceleration, hard starting, backfiring, or "pinging" or "spark knock". So if you cruise at a lean mixture and them decide to climb without adjusting the mixture, you might get detonation. After that, I was able to use 87 octane for about 2 years without any pinging. Also the idle seems to wander a bit, sometimes just 100 or so rpm sometimes varying up to 400 rpm. In addition to this I have rough idle problem when accelerate or stop at signal light. Causes of pinging/knocking on 4-stroke engines. The K20A : Honda's first DOHC iVTEC Engine. * More overlap => more high-RPM power, less low-RPM power In a naturally aspirated engine, the extra overlap is called "scavenging". If the timing is too far advanced, the spark itself 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. Ping Ping Ping I have a 2008 Road Glide with a little over 50,000 miles on it. I would try switching gas stations and maybe brands to see if things. Hey, anybody got bad valve pinging or engine just sounding horrible upon hard acceleration top end rpm's? Mine didn't always do that , but it has the past 5,000 miles or so?. The fact the the engine pings at 3,000 RPM make sense because that's where the engine is developing peak cylinder pressure. Driving is a central part of the game. If running at low RPM were a real issue, Porsche would put a time limit on operation at idle. The terms valve clatter, pinging, pre-ignition and detonation describe the strange rattle or knock coming from an engine. The check engine light has never come on. 000 RPM, sometimes even more. I am using premimum fuel and non-ethanol fuel when I can find it. Pinging for 2007 RAV? Jump to Latest Follow 1 - 14 of 14 Posts. 7L Engine — If Equipped This engine is designed to meet all emissions regulations and provide satisfactory fuel economy and performance when using high-quality unleaded gasoline having. The next time you hear the rattle push the rpms up to around 2500 and see if quits. As soon as it downshifts from 4th to 3rd, it start pinging and I have to get out of it until it's happy again. Low idle speed after start & engine pinging in hot weather after starting the engine, RPM goes up normally to 1600 RPM for 20 -30 secs but then falls quickly to. I run the best gas I can find and octane booster. I had the same issue with a BBC engine. If the engine has a flat spot, or is popping/sneezing in the air cleaner, it can indicate a lean condition. Re: Brief knocking/ pinging noise coming from engine and smoke coming out of my 2007 that rpm is the torque spike in that engine, fuel injectors being clogged would cause pinging, but should throw a code for lean mixture maybe. If I back off the timing tell it quits pinging and runs w. I'm kinda stuck in finding out what the idle speed should be on my 03 3. Seems like the 2013 Kia Rio Transmission computer is set to shift too early or the engine is not tuned to handle load under 1700 RPM in gears 2-6 without pinging. »CAN Bus 02: Get Engine RPM. It sounds like it happens on one or two cylinders. I was just wondering if running at low RPMs hurt or did anything that it wasnt supposed to. It doesn't ping down low in 2nd or 3rd, it tends to make that ball bearing rattle sound in the upper rpm of 2nd and 3rd. In the manual for the Durango I bought my wife Thursday it says: 5. Hi guys, My 2002 Corolla CE gradually developed a slight and intermittent knock/rattle sound almost only at high speeds (60+) and upon increased load (e. Worst case scenario: you're looking at costly, if not catastrophic, engine damage. One cause of pinging could be low, fuel pressure. Diesel Engine Trouble Shooting Chart. As rpm increase the “ elly” normally reduces and may even “not exist”. In theory, timing is easy to understand - the spark has to be delivered from the distributor at the perfect time to achieve maximum combustion and more importantly, the most amount of horsepower. Apart from running with no oil, the engine ping/knock is probably the second worst thing that can affect the longevity of an engine. Mine will happily chug along at 5-600 rpm. 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. Premium fuel will help so I think it is really a knock situation. Letting the rpms get into the low-2000 range when going up an incline is a sure-fire way to encourage an engine to ping. What is pre-ignition or valve clatter?. This should resolve the. After rebuilding the exhaust manifold, altering the inlet manifold and rebuilding the turbo, I only managed to get 2800 rpm and 28 in. Distributors for MG T-Series XPAG and XPEG Engines By Bob Grunau. (CVE-2014-2851, Important) Use-after-free and information leak flaws were found in the. Engine knock/pinging 5 Answers. Sounds like an engine with the timing way off. Noted below are a few facts about why an engine knocks and what can be done to resolve these issues. On the way home pinging started at 2800 RPM. When the engine is cranking, the timing will be retarded. Oil is good, all filters and fluid levels are good, but when in second gear and accelerating under a load (uph. for a typical 145 pis engine, you may get 180 psi readings in all cylinders if a lot of carbon is present on the piston tops. Car runs good. Done as a result of low rpm's, lots of throttle and high load (let the clutch out too fast. Except for knock/ping due to engine luuging most modern day EFI engines use A/F mixture adjustment, enrichment. The MAF was also cleaned using CRC MAF Cleaner. I've had this problem ever since I bought the car ('91 TT) 3 months ago. 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. I understand these engines are kind of noisy and clatter a lot, but this seems to be a strait up "ping!" Like spark knock, detonation, etc. It isn't hard ping, but light, but I still don't think a car with less than 7k miles on it should do that. Mazda Buyers Guide -- 2000 Mazda MX5 Miata 2dr Conv SE Special Edition pricing, mpg, engine, transmission. Amsoil Motorcycle Octane Boost 4 FL OZ Engine Ping Eliminator Maximizes Power & Performance When treated at 1. > > I bought brand new HIF4 carbs last year for a 'smog' > check (couldn't adjust > the old ones to idle low enough). Octane rating is a relative number which represents resistance to ignition. in the winter of last year i had reset the dist curve for 20 initial and 35 total at 2500 rpm. I had pinging and the cause was a slipping clutch. I wouldn’t call it a knocking noise, best way to describe it is what a fuel injection vehicle sounds like with cheap gas. If the engine has a flat spot, or is popping/sneezing in the air cleaner, it can indicate a lean condition. After some data logging i noticed severe knock corrections at those RPMs. Engine Pinging, Missing, and Rough Idle - posted in General Daihatsu Problems: Hi All, I have some issues with my Daihatsu Sirion 2005 1. The pinging occurs once the engine is warmed up, and seems more prominent when the ambient temps are warmer. If this is the situation then simply don't open the throttle all the way until the rpm gets higher, say above 2500rpm. Now I know it is probably the centrifugal advance advancing too much at those higher rpm, so if I just tighten those springs just a notch or two more that might solve that problem. No search has helped, either here or Google, the local Ford dealership wants me to bring my truck in so they can "go through it" for me, and I'm not havin' any of that crap. If the advance is at too high or low of an rpm, the engine may overheat or not run up to its potential; it may feel lazy on acceleration. This indicates that the original oxygen content was very low at the high engine load, and the application of EGR further diluted the oxygen concentration, thereby curbing combustion and reducing the CP. After the injectors were replaced and coil pack(s) it seems to run fine. I have used some fuel system cleaner and fuel octane booster but it did not solve the issue. 2018 GT low rpm engine rattle, cylinder damage pics, Ford buyback process. teapea · Guest. What should I look for to try to fix this. The inline arrangement limited valve size. The computer system is supposed to compensate for lower octane fuel and the manual does not state you must use High test octane gas. I don't hear it while in neutral and revving the engine, but when accelerating in gear from a stop I hear it. Start the engine and set it to idle at about 1,000 rpm by turning the idle-adjustment screw on the throttle body clockwise. An online community for late model GM V8 engine performance enthusiasts. When the truck has been at operating temp for a while Climbing a hill using light throttle, at low rpm, I hear some very worrying tapping/knocking from the engine compartment. These numbers don't seem overly high to me, but I'm still getting pinging under load (not WOT), though not as bad as the day I brought it home. There was also a major exhaust leak from the manifolds and it fell on its face above 4,000 rpm. It is NEVER heard at idle, as there is no load on the engine then, and it generally goes away at higher engine speeds (above 3K rpm). Engines designed with timing gears, or those equipped with a timing chain and sprockets, can produce different noise. Polyether Amine It can help clean a vehicle's combustion chambers, reduce engine knocking and pinging, remove harmful sulfur deposit from gas gauge sensors and relieve cold-startup issues. —to severe overload and creates a pinging or knocking sound. Actually thats not correct. Example: Pulling a loooooong steep hill. 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. Octane rating is a relative number which represents resistance to ignition. For example, let's pick a specific engine operating point, 4000 RPM, WOT, 98 kPa MAP. My thoughts about engine rpm and how lugging your motor too often can eventually cause problems for your bike. Smooth power delivery and strong low-end torque facilitate slow-speed manoeuvres, offering both a high level of control when making minute throttle adjustments and a gratifying rush of acceleration in the. Knocking should not be confused with pre-ignition—they are two separate events. This will cause low pump pressure above 4000 rpm and a loss of engine performance. jareth-09 writes Why are running it so slow ? I think you might be labouring the engine. Pinging is a higher pitched metallic sound, a 911 engine pings mostly at higher rpm, around the torque peak, at WOT, especially when the air and oil temperatures are high. Lower rpms at slow speeds make things worse. Allow the engine to idle for fifteen minutes. A hot engine is more likely to suffer spark knock than one which runs at normal temperature. The carbon deposits were so bad that I took the engine apart and reconditioned the heads. Two stroke engine failure, engine ping, low octane fuel causing piston detonation. Don't be afraid to give it some rpms, they're not a car engine where you're probably used to lower engine rpms. You can run oversquare, but if you go full power at a real low RPM, youll be lugging the engine. ESC is used to sense spark knock (pinging) and retard the timing to eliminate it. You usually hear this noise when accelerating the vehicle. but could also be too low fuel octane for the engine's compression ratio. If you don't have enough oil, or enough oil pressure, the top end of your engine will suffer first. It's a problem not easily dealt with, and not cheap either. With the vehicle in operation, note the maximum amount of vaccum generated by the engine while in gear and being held at a steady speed between 2000 and 4000 RPM. These numbers don't seem overly high to me, but I'm still getting pinging under load (not WOT), though not as bad as the day I brought it home. The low speed hesitation could also be attributed to the inherent bad fuel/timing maps built into the ECU from the factory. On flat ground, I can let the clutch out at idle and not kill it. I am noticing engine shake at the time of engine start and stop (Switch off). Joined Jan 1, 1970 · 0 Posts. Something you should do regardless of the CATs needing replacement or not is flush the engine, oil flush. Another way is to take the engine up to 3500, or so, rpm and short out one spark plug at a time and adjust the cables for equal rpm. The check engine light has never come on. It would happen when I was accelerating or pulling a grade, I could not make it happen by by just reving the engine in neutral. Noticed a knock/ping coming into my city parking garage going slow and uphill about a month ago. Dealer says it's functioning as designed. Discussion in 'Issues, Repairs, Warranty, TSB, Recalls' started by bigriver, Apr 27, 2018. What sort of failure would cause an engine to misfire at light to constant throttle at mid RPMs (i. The ECU just assumes the pressure is there and within limits.