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  1. 03-27-2015, 02:00 PM #1
    ZeroXploit
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    red
    1999 camaro 3.8L

    need help diagnosing noise




    any ideas.
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  2. 03-27-2015, 05:43 PM #2
    pajeff02
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    Black & Blue
    '02 WS.6 / '07 Suburban

    If it was a V8, I'd say that the secondary air system check valve was blown out and the hose had come off. So tough to tell - it has a higher pitch to the noise than a rod knock. Sounds like a metal scrape combined with a bad exhaust leak.
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