Thread: Misfires
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      01-25-2013, 05:06 PM   #5
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Drives: 2010 335i Coupe/Space Gray
Join Date: May 2010
Location: DFW, TX

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2010 335i (E92)  [5.00]
Originally Posted by cmyk View Post
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.
thanks for the info! no, valve cleaning job is on the horizon though.

EDIT: How much of a pain is it to swap coils?

COBB Stage 2+ AGGRESSIVE / STETT Cold-Air Intake / STETT Charge Pipe / TiAL Blow-off Valve / ETS 5" Front-Mount Intercooler / Active Autowerke 3" Catless Downpipes / Active Autowerke Signature Exhaust / AST 4100 Coilovers / OS Giken Superlock LSD / All MOTUL Fluids