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Hunting idle and surging acceleration

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    Hunting idle and surging acceleration

    Ok so my BMW hunts 90% of the time on idle 2krpm and back
    When I remove the oil cap it stops :s excessive blow by?
    Also under throttle the car surges in power, in the exact same interval as it hunts.
    Which has me thinking its a sensor or something rather then crank pressure causing it?
    What else should I look at?
    I've seen alot of threads about surging accel being o2 related so my first step is timing belt and o2 sensor
    M20b27

    #2
    Vacuum leaks, buddy.

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      #3
      Yep, intake leaks are the most likely cause. Have a shop run a smoke test.
      The car makes it possible, but the driver makes it happen.
      Jim Levie, Huntsville, AL

      Comment


        #4
        How does removing the oil cap settle the idle? Isn't that just a big air leak too?

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