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high RPM sounds like backfire

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Old 04-12-2019, 01:28 PM
minicountrymanS
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high RPM sounds like backfire

Recently my CM S feels like hesitation or backfire whenever I press heavily on the gas peddle (high RPM)

Any one have any idea, I was thinking of a bad plug or bad coil, no codes.

The car is running Stage2 ….. normal driving everything is fine.

Thanks
 
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Old 04-12-2019, 01:39 PM
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Originally Posted by minicountrymanS View Post
Recently my CM S feels like hesitation or backfire whenever I press heavily on the gas peddle (high RPM)

Any one have any idea, I was thinking of a bad plug or bad coil, no codes.

The car is running Stage2 ….. normal driving everything is fine.




Thanks
I would look at plugs, coils or HPFP.





mQubed Motorsport Manic & RPM Power Tuning

 
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Old 04-12-2019, 03:33 PM
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Great, thank you so much Mario, I will start with the plugs and then coils … the HPFP was replace under warranty a couple of years ago.

Thanks a million

Patrick
 
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Old 04-19-2019, 04:52 AM
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Just replaced the plugs with an old set I had kept, they solved the problem, will be ordering a new set.

Great forum thanks again Mario.
 
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Old 04-19-2019, 08:08 AM
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Originally Posted by minicountrymanS View Post
Just replaced the plugs with an old set I had kept, they solved the problem, will be ordering a new set.

Great forum thanks again Mario.
i love a simple fix.

mQubed Motorsport Manic & RPM Power Tuning
 
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Old 05-03-2019, 09:51 PM
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Glad to hear it’s resolved. Many times it won’t show a fault but will show a fault when plugged into a BMW diagnostic software like ISTA, etc.
 
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Old 05-04-2019, 05:15 PM
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Today's update, this morning I replaced the 4 coils (with OEM ones) and that finally corrected the backfires at high RPM.

The Ponies are back on my CM stage 2.
 
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