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Knock sensor and airconditioner bearing noise causing a drop in performance?

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  • Knock sensor and airconditioner bearing noise causing a drop in performance?

    I have started to notice a noise coming from the clutch bearing on the aircon pump. Very annoying.

    Also noticed a drop in performance.

    I put a few drops of oil in the area of the bearing and it is almost silent and the performance has improved.

    Is it possible the bearing noise is being picked up by the knock sensor and pulling the timing?

    Next job on my ever shorter list is the aircon clutch bearing replacement.

  • #2
    Plausible I would say. I have been chasing (false)knock for years now. Changed alternator, aircon and re-check my rebuilt engine internals but still getting random knock at random moments.

    Try to drive the car with aircon belt off. And also without paspump belt if it makes any difference...
    S2 Avant SleeperWagon 570hv and 765nm on 2,2bar/E85

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    • #3
      I was getting knock detection when my ISV was as tapping on the Wagner IM, it wasn’t in its rubber holder.

      S2 Coupe 3B Project


      Ur quattro restoration

      S2 Avant

      Boost is the new rock and roll!
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      • #4
        I am not getting an alarm its just strange the performance changed after a bit of oil on the aircon bearing.

        Will fix the S2 aircon bearing after my S4 B7 front crank oil seal, belt tensioner, idler pulley and belt have been replaced. Belt came of the other day and damaged the crank seal.

        S2 being used every day

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