Question about 2001 Pontiac Grand Prix

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Misfire at 4000 RPM

My car looses power at about 4000 RPM and starts to misfire or seems like its on the rev limiter.Theres some whining noise also.Now car is starting to mis fire at exceleration

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You may be in need of a tune up. Try squirting some wate (with a squirt bottle not a hose) an look for arcing, aslo squirt around the coil, you should eather see or hear thedifferanceonce they are et.

Posted on Jul 21, 2009

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03 mitsubishi endeavor engine cuts out at 4000 rpm when driving revs fine when in neutral. It has no engine codes. any ideals?


At 4000 rpm what does your speedo say. Your computer may be limiting both your mph and your rpms. I have a 2004 Ford Ranger at 90 mph the engine sputters and seems to miss. It will stay at 90. In neutral it revs fine. My problem is because of chip programming in the computer. Your problem may be the same.

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Hi Tom your vehicle is equipped with a Rev limiter it will not allow you to rev the engine above 4000 with the trans in park; as for the first problem you may have one of two things, one of the spark plugs or spark plug wires is bad or you have a flat spot on the throttle positioning sensor in which case have be replaced. Good luck?

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Check the prongs on the #1 coil to see if it is crackd if it is left alone it will eventually turn to a multiple misfire, also take the coil off to make sure nothing is shorting out.

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Volvo s60 is still misfiring at 3000-4000 rpm. I changed the spark plugs and checked the coils and fuel injectors all good. Can't seem to find the problem. Any help! Also, my check engine light turns off...


Has anyone checked your "rev limiter" ? It is a sensor that will not allow you to "rev" your engine past a cetain RPM.
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Car has no power and has a rattling noise


RPM and speed do not match what I'd expect to see at 120. but that could be gear ratio being different than I'd expect. Most don't like to run at 4k. Most problems at that rpm is either plugs (experiment with different gap settings or change heat range one step colder or hotter) or can be coil related (work fine except when recovery time is shortened due to rpm). However, the weird noise may be due to a partially plugged catalytic converter. So, check that as well. If you have a knock sensor, test that too.

Oct 04, 2009 | 1999 Pontiac Grand Prix

1 Answer

Looses Power at high RPM's


Hello! A cylinder misfire can be something as trivial as needing new spark plug wires, to having a dangerous lean condition in the fuel mixture. Assuming that you have a stock, un-modified car, with a stock, un-modified PCM, my suggestion would be to swap the coil packs, to isolate whether or not the 1 - 4 coil pack is faulty.


Hope this helps, and thanks for using FixYa!

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Ive got a focus st170 and about 4000 revs it seems to missfire


  If you mean in neural it misses this is normal. It has a rev limiter to save the engine. You are bouncing it off the chip at 4000 rpm.

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