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  1. #1
    Member ssgtcarroll's Avatar
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    Nov 2005
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    East Prospect, PA
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    37
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    155
    91RS 99Z28 11GT 86Bronco

    Knock even when its hot outside

    I have a 99 Z m6 with 104k on it.

    I am getting knock at start up even when its hot outside. It does get less once the eingine warms up but I can still hear it a little.

    Any ideas where to start looking?

  2. #2
    Senior Member INMY01TA's Avatar
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    Jan 2006
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    Marylandistan
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    5,761

    Black
    2001 Trans Am (sold)

    Run some Sea Foam thru it, if your getting oil in the intake, put a catch can on it. If none of that helps, get a 160' thermostat, new plugs, and put it on a dyno and tune it.

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