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  1. N

    hmmwv exhaust heat shield noise???

    I get a vibrating high pitch noise on my 1989 M998 at about 35 mph and goes away at about 40 mph. it sounds like an exhaust heat shield noise. I check for loose parts but can not find anything. Any ideas? Thanks
    • neos
    • Thread
    • Replies: 9
    • Forum: HMMWV
  2. N

    m998 hmmwv hissing noise

    1988 m998 hmmwv constant hissing noise on inside by brake petal. Brakes work fine. Checked power steering, brake fluid. All good. Tested Hydro boost seems to be working. No leaks on power steering either. Any ideas. Hissing noise driving me crazy. It was not there 2 days ago. Thanks, NEOS
    • neos
    • Thread
    • Replies: 29
    • Forum: HMMWV
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