Backfiring after JB4 ISO firmware update?
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12-16-2012, 03:29 PM
Drives: 2012 135
Join Date: Nov 2011
Location: so cal
Just FYI, that's afterfire, otherwise known as little pockets of unburnt fuel igniting in the exhaust. Backfiring is a far more serious issue usually requiring, at the least, a new intake manifold after it happens
Overrun/afterfire is no big deal.
2012 135i. dinan stg3 | ohlins dfv
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