On two occasions my B5 has misfired badly. The car started from cold and after about 4 minutes of driving, under light acceleration from 2k revs to 3k the engine coughed, warning light came on and power dropped dramatically. Starting the car cleared the problem. On the second occasion I was leaving the dealer after they had checked everything. Managed to limp back and diagnostics showed 'engine misfire' but no cause.
Car was back to dealer today as Alpina engineer was there. They are puzzled, think it is mechanical rather than software/electronics and have downloaded all metrics back to Buchloe. Current thinking is it may be a known problem with BMW V8 cylinder heads. Seems there was a batch of rocker arms out of spec and 545/550i's have exhibited the problem. They are not sure if Alpina heads were affected although they are standard BMW items.
Anyone heard of similar problems with either B5's or BMW V8's?
How did this get resolved in the end? I've got a 2005 B7 and i'm occasionally getting the same problem.
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