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  1. #1
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    Member No: 183609 PEIZ3 is an unknown quantity at this point PEIZ3's Avatar
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    Oct 2010
    Rep Power

    Yes | No

    '99 Z3 Dual Vanos 2.8...Power Loss...HELP !!!


    I have an on going power loss issue since June with my 2.8. The symptoms are as follows...

    Rough idle at cold start w/ little throttle response...

    Sluggish acceleration once idle issue settles down...

    Cruising slightly below / above 3000 rpm for a period of time the car loses power - no throttle response - but will idle and not stall. Turn off ignition and restart everything works fine until the cycle repeats.

    I have done the following...

    Replaced O2 sensors...
    Replaced fuel injectors...
    Replaced fuel filter...
    Replaced intake manifolds...
    Cleaned MAF twice...
    Rebuilt Vanos w/Besian parts...

    Each stage has resulted in a return to short term good performance...then back to check engine light and the original problem. Codes started with O2 sensors and misfires...now misfires and I can see that with the idle issues.

    Anyone with an idea concerning this issue please enlighten me as I have much time and money into this without success.

    Thanks !!!

  2. #2
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    Member No: dp's Avatar

    Yes | No

    cam sensor? just guessing.

  3. #3
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    Member No: dp's Avatar

    Yes | No

    here's an old thread. use search for more.

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