Quote:
Originally Posted by EnVe46
Im BM3 stage 2 91 octane tune, wanted to be on the mild side due to DCT clutches, and Im getting a hesitation/misfire up top in 3rd,4th,5th gear that was noticeable under WOT. I assume the stock plugs are my issue. After some reading seems most people are between .18-.22, is this accurate? What did you gap them too?
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you should have the plugs gapped to .18-.22, change your plugs and coils most likely. if the issue is not resolved with that, do the injectors.
I believe they all come gapped stock to something in the .36 range. you should close the gap accordingly. stock plugs will work just fine though. i would suspect though that the car is blowing out the spark when you are misfiring.
I had the same issue when i bought mine and changed all of the plugs and coils, with genuine BMW parts, for piece of mind, completely fixed my issue.
as a rule of thumb if you are going to change coils or plugs, just do them all at the same time.