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Thread: engine clatter at idle after warmup

  1. #1

    Default engine clatter at idle after warmup

    My 99 540i with 166,000 miles began making a clatter sound at idle after warmup. When engine first starts cold the sound seems normal. When warm and clattering at idle, the clatter sound is not noticeable at higher rpm. The sound comes from the right front of the engine. What could be the source?

  2. #2
    Join Date
    May 2004


    top or bottom of the engine, right side from driving direction there is the timing chain tensioner
    or one of the pulleys in front of the engine from the belt tensioners?
    get a cheap mechanics stethoscope, with that it is much easier to find the source of the noise, costs abt $10

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