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Thread: Startup Noise

  1. 12-04-2005, 11:20 AM #1
    ss~zoso~ss
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    Unhappy Startup Noise

    When i start up my car, about 75 % of the time a loud pop comes from the exhaust. This only happens at start up, i have no SES codes, i had a flowmaster 40 series muffler installed, but i have no futher exhaust mods

    what could be causing this pop?
    Last edited by ss~zoso~ss; 12-04-2005 at 11:23 AM.
    98' SS Convertible Camaro-76k-Build # 1471, Cragar SS rims, RK SFC's, MAC Panhard, LSX Tune, Shaner S3,
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  2. 12-04-2005, 04:32 PM #2
    sonnyred
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    Sounds like raw gas igniting in the exhaust system .Mine does it if i goose it when its cold but ok after a half minute warm up.
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  3. 12-04-2005, 04:39 PM #3
    ss~zoso~ss
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    it only happens once, just one pop, like a pocket of air in the exhaust or something, it boggels my mind, it doesnt smoke or anything
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  4. 12-07-2005, 01:45 PM #4
    ss~zoso~ss
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    any ideas
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  5. 12-07-2005, 04:22 PM #5
    sonnyred
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    Unburned gas--backfire --once only, same as mine and a hundred other guys. sometimes its pop-pop-pop-only when its cold.
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  6. 12-07-2005, 04:47 PM #6
    ss~zoso~ss
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    what causes the unburned gas to get into the exhaust
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  7. 12-07-2005, 06:06 PM #7
    sonnyred
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    Quote Originally Posted by ss~zoso~ss
    what causes the unburned gas to get into the exhaust

    The car is cold the gas is set rich on start up --pop
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  8. 12-07-2005, 06:09 PM #8
    sonnyred
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    That just my experience.
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  9. 12-08-2005, 01:08 PM #9
    ss~zoso~ss
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    hmm, idk
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