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      02-14-2012, 07:08 PM   #6
335iVA's Avatar

Drives: 07 335i 6MT
Join Date: May 2011
Location: California

iTrader: (0)

I had the same problem. I first noticed a misfire on Cyl. 4 when in Map 1. I moved to Map 5 and it was running for a month or so, then started misfiring on Cyl. 4 again. The only time it would not misfire was when I was running stock bypass. Changed the plugs, problem fixed. Car has been running smoothly ever since... So check the coils, change the plugs, you should be good to go. Hopefully its not your injectors, but if you are under warranty, shouldn't be a problem. Have you had the injectors replaced yet?