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Thread: 2011 E90 328xi squealing

  1. #1
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    2011 E90 328xi squealing

    My 2011 328xi has about 125,000 miles. I bought the car with 35,000 and have not changed the serpentine belt or tensioners. On Friday morning it was a bit cold out and when I arrived at work after about a 30 minute drive the engine was squealing loudly at idle.


    The noise has been intermittent since then and takes a bit of driving (warm engine) to start. Then it subsides a bit as the RPMs increase to became nearly inaudible at highway speeds and 3,000 RPMs. But at idle it is extremely loud and high pitched.

    I was thinking to replace the serpentine belt and idler arm pulley. But admittedly have no idea where the noise is origniating. Yesterday my best mechanic friend (good with engines but not BMWs) thought the sound may be coming from a bit lower in the engine compartment guessing an air pump?

    Any guesses if I should just R&R the belt and idler pulley? or ?

  2. #2
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    Definitely do the belt, idler, and tensioner. If that belt shreds for any reason, it can get stuffed through the front crankshaft seal where it can wreak havoc inside the engine.
    Quote Originally Posted by elvirb87 View Post
    this is how i look at it from my perspective.

    If you buy an M5 and don't drive it hard its like paying a hooker for a hug.

  3. #3
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    Thanks, I replaced the belt and idler arm pulley Wednesday night the sound disappeared. Gone Thursday all day as well. However sure enough this morning it returned along with the slow/rough idle. I didn't replace the tensioner. Should I look into that air pump? or tensioner next? should I replace just the tensioner pulley or the entire assembly?

  4. #4
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    The tensioner and pulley is one assembly.

    There is no such thing as an air pump on your BMW. Are you talking about the a/c compressor? For what it's worth, I've had a few N52 power steering pumps make noise. But it's a fairly distinctive sound. Kinda like a whining more than a squealing.
    BMW Level 1 Master Technician
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  5. #5
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    Thanks White, the squealing was from the very bottom of the belt area, could have been the A/C compressor, but turning the A/C on/off seemed to make no difference? also turning the wheel didn't change the sound at all either?
    Also while at Autozone I thought they would sell the pulley only for about $60 and I paid $115 for the pulley and tensioner?
    I think the part numbers were
    PULLEY - BMW (11-28-7-535-860)
    BELT TENSIONER - BMW (11-28-8-624-196)

  6. #6
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    Here is a link to a 15 second video recording of the sound if that might help anyone, thanks!

    https://www.flickr.com/gp/127124632@N03/91125F

  7. #7
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    Quote Originally Posted by dabagboy View Post
    Here is a link to a 15 second video recording of the sound if that might help anyone, thanks!

    https://www.flickr.com/gp/127124632@N03/91125F
    I haven't heard a sound quite like that before, that's very loud and high pitched. Does the sound change based on rpm?
    Quote Originally Posted by elvirb87 View Post
    this is how i look at it from my perspective.

    If you buy an M5 and don't drive it hard its like paying a hooker for a hug.

  8. #8
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    Quote Originally Posted by RocketSurgeon View Post
    I haven't heard a sound quite like that before, that's very loud and high pitched. Does the sound change based on rpm?

    Thanks for listenin -- yes it silences at about 2500 RPMs, very loud at idle and decreases as I accelerate or simply rev the engine.

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