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Old 10-25-2012, 04:49 PM
TXFred TXFred is offline
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Location: Austin, TX
Join Date: Apr 2012
Posts: 236
Mein Auto: 2008 335i Convertible
Injector or coil is the most likely cause. I had the exact symptoms you described on mine, and it was the coil.

The car ran fine, but would misfire under boost, then operate roughly and with reduced power until I shut it off and restarted it. I have I-Drive, so the screen would tell me which cylinder was misfiring.

The simple test is to move the coil to another cylinder, make it throw a code again, and see if the misfire is on the new cylinder.

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