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BMW 525i M54 / engine noise

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Uploaded by on Jun 30, 2010

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Autos & Vehicles

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  • Did you find out the reason for that?

  • Did you find the reason for this sound?

  • Sounds like the serpentine belt idler pulley, and or belt tensioner. Bearings often go bad in both of these.  Noise is subtle at first, then gets louder after a few weeks. Is also louder / noisier when you put the car in gear & keep your foot on the brake (no throttle). Gets quieter when you rev the engine above idle. I just pulled both the tensioner and idler off of my car tonight & the bearings are noisy in both. Don't let this go too long or the bearings WILL fail and can cause damage

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