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Thread: Rough idle and cel

  1. #1
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    Rough idle and cel

    Hello, Iím new the the bmw world I just picked up a 06 330xi as a project car. I currently have a p1415 code. After reading through the forums here it looks like itís either a vacuum leak, maf sensor or a vacuum leak. In terms of testing how would I go about testing the maf or that injection pump for failure before I throw parts at it?

  2. #2
    dworthy's Avatar
    dworthy is offline Wagon meister :) BMW Tech Expert
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    Welcome to the Forum!

    Vacuum leaks are very common on these cars, best way to find them is get the intake smoke tested. If you want you can also inspect every piece of rubber, looking for cracks, splits, etc. that would cause a hole. If you find a hole or two using a smoke test, be sure to go back to confirm all are found, for a smoke test will only find the largest holes at that time, there maybe more smaller ones.

    As for a MAF sensor, you can do a live data check if you have a decent scan tool, normally I use ISTA and it has a graph that shows what's proper.
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  3. #3
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    Quote Originally Posted by Fxdlr View Post
    Hello, Iím new the the bmw world I just picked up a 06 330xi as a project car. I currently have a p1415 code. After reading through the forums here it looks like itís either a vacuum leak, maf sensor or a vacuum leak. In terms of testing how would I go about testing the maf or that injection pump for failure before I throw parts at it?
    This is the first year E90 N52 with the alloy valve cover.

    1. Invest in a good scanner - INPA, Autel, Bimmegeeks etc.

    2. This fault is for an unmetered air leak.

    3. Most common on this motor, for this fault, is the crankcase ventilation valve/oil separator under the manifold 11 61 7 531 432 including 11 61 7 559 530, 11 15 7 522 931 and 11 15 7 567 802.

    4. If the manifold was removed previously then check for a disconnected or broken hose to the separator. Due to the design it is difficult to remove and refit the hoses to and from the ventilation valve.

    5. Ensure that the hose is correctly fitted to the air box/air meter, it is a tight fit and the lower part of the hose usually sits crooked causing an air leak.

    Mark.
    Last edited by mandd; 01-23-2023 at 09:14 AM.

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