Thread: Misfires
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      01-25-2013, 02:33 PM   #3
resident girl.
cmyk's Avatar

Drives: 2008 335i
Join Date: Dec 2011
Location: Dallas, Texas

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2008 BMW 335i  [4.38]
Have you had your intake valves cleaned? I wasn't seeing misfire codes, but was getting small "hiccups" -- and occasionally larger ones that really felt like misfires, but no codes being thrown -- with Cobb installed, running Stage 1 Aggressive + FMIC (mine also diminished or went away when Cobb was uninstalled). Had intake valves cleaned in December and the issue has not resurfaced. Coincidentally, cyls 4 and 6 were the nastiest looking IIRC.

Also, if you want to confirm a bad coil, reinstall your Cobb and swap coils on 4 & 6 with 3 & 5. If the misfire codes pop up on 3 & 5, there's your answer.

2008 E90 335i // Black Everything // photos
COBB tuned / QTP e-cutouts / Helix FMIC / cp-e DCI / AWE BOVs / Black M6 wheels + Toyo Proxes
(and yes, I am a girl)