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Thread: 2008 BMW M5 weird Squeaking sound

  1. #1
    Join Date
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    2008 BMW M5 weird Squeaking sound

    Question, my car developed some weird squeaking sound. It appears very rarely, so far it happened only 3 times in past 3 weeks, only lasted may be 5 seconds.
    I already replaced:
    Drive belt tensioner pulley (11281738605)
    Idler pulley (11287839135)
    Tensioner pulley (11287839133)

    I'm replacing my belts this week also (they have 7k on them), just to rule them out.

    Car is 2008 BMW M5 with 59k miles with evosport pulley.

    My next guess would be:
    AC clutch / pulley? It seems like AC off / on didn't effect the sound when it appeared. Power steering pulley? Alternator (doubt it)?

    My question would be, are any of the pulleys, AC / Power steering / Alternator prone to fail? I heard power steering pump going out at 60k, but I don't have any symptoms (no chatter when turning the wheel etc.)

    Also, is it possible for the pulley to fail randomly without making all bunch of noise prior? (squealing for certain period of miles before it gives out).

    Any help appreciated.


  2. #2
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  3. #3
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    No codes. It sounds like a belt squeak, but I'm not 100% sure. Again, it happens very rarely, car runs / drives fine. Usually when it happens, by the time I pull over and pop my hood the sound is gone, so it's hard for me to pin point where it's coming from. I'm leaning towards AC though.

  4. #4
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    I guess the main question here is, have anyone had their AC / Alternator / Power Steering Pump pulley fail, and if it did, did it make any type of sound before the failure, and if so, for how long.

  5. #5
    Join Date
    Oct 2015
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    Brighton, ON, Canada
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    2006 BMW M6 coupe
    re "Weird Squeaking Sound"
    I had the same experience. Whenever I put the accelerator pedal to the floor, a strange sound emanated from the passenger side of the car. Solution was to leave my wife at home.
    David
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