Quote:
Originally Posted by Phil325i
I feel your pain! Having just replaced my injectors (again) and HPFP, I know about big bills!
Just be aware the valve cover can develop hairline cracks due to heat cycles. Also, a whistling noise might indicate problems with the PCV system. My indy advises if you're removing the valve cover for leaking gasket then replace the whole cover as a precaution.
If you try to remove the oil filler cap with the engine running, do you experience excessive vacuum resistance?
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My indy tested it 2 weeks ago and said he felt a strong suction. I think the cover has never been replaced. I guess it is possible that a crack near cylinder 4 might also be a cause of the misfires? We haven't noticed oil leaks anywhere though. Oh the thing I forgot to mention is all 6 injectors were replaced at 80k, but I bought the car with a Index 2 injector in cylinder 2, which is a bit shady. I took it to BMW for an initial diagnosis and they said there were issues in cylinder 2 and 4. We have replaced that one and haven't heard from cylinder 2 since.