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Thread: High Pitch Buzzing Noise Undercarriage rrage

  1. #1
    Join Date
    Nov 2005
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    Orlando FL
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    1987 325i Convert

    High Pitch Buzzing Noise Undercarriage rrage

    I am hearing a high pitches buzzing noise underneath the car. It’s more prominent on the passenger side near where the exhaust cats are when idling. Anyone have a clue on what could be making that noise?
    Last edited by dcwang3; 07-02-2020 at 10:07 PM.

  2. #2
    Join Date
    Jul 2003
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    I dunno
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    2,182
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    '90 Ford Tempo
    It could be your airpump running on, but there are no devices near the cats (heat).
    You need to hunt a little more.
    My suspicion is a failing fuel pump further back.

  3. #3
    Join Date
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    1997 M3/4/5
    Could be a loose heat shield (broken weld) on the catalytic converter. Typical issue.

  4. #4
    Join Date
    Nov 2005
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    Orlando FL
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    1987 325i Convert
    Quote Originally Posted by craigjimc View Post
    Could be a loose heat shield (broken weld) on the catalytic converter. Typical issue.
    hmm ok, I'll have a take a closer look. Thanks for the suggestions

  5. #5
    Join Date
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    E36 M3/4/5, E32 740il
    Quote Originally Posted by dcwang3 View Post
    hmm ok, I'll have a take a closer look. Thanks for the suggestions
    I was going to say the same thing. My heat shields on my cats break loose sometimes and make a ton of noise.

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