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Z3M strange engine sound

Discussion in 'Z3 M Roadster & Coupé' started by Z3Mroadster, Jun 30, 2019.

  1. Z3Mroadster

    Z3Mroadster Dedicated Member

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    Hello!Engine S50B32
    I was cleaning ICV valve and throttles and after that my engine have higher idle(950)and strange sound from top engine on 1500 rpm(similar as when no valve adjusted)...And in ride on 2000 I hear some misfire in 2nd gear...
    Power is okay...Only I see a little higher fuel consumption...
    I was check lambda okay,but have too much HC in exhaust...77ppm in idle and 44 on rpm...

    What is potential problem?