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cold start up knock?

This is a discussion on cold start up knock? within the GM Trucks forums, part of the Vehicle Specific category; i have a 2000 silverado with a 5.3. it has what sounds like a knock for the first 20seconds or ...

  1. #1
    Junior Member eric69cam's Avatar
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    2000 silverado 5.3

    cold start up knock?

    i have a 2000 silverado with a 5.3. it has what sounds like a knock for the first 20seconds or so on start up. i've heard from a few people i know with as little as 30,000 miles that theirs does the same. does anyone know the problem? any help would be appreciated

  2. #2
    Junior Member RandyW's Avatar
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    My Tahoe developed it at about 80000 miles. It was just carbon build up, though I don't baby it. I towed a car through the mountains and mine went away, I guess the extra heat and rpm broke the carbon loose and cleaned it out!

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    Junior Member eric69cam's Avatar
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    2000 silverado 5.3

    cold start up knock

    well i can't really say i baby mine at all. i tend to have a heavy foot. it just seems to be pretty stubborn. i am in the process of changing plugs and wires. wires are done through msd. just waiting on the plugs. i guess i'll see what that does for me. thank you though

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    Junior Member RandyW's Avatar
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    I never babied mine either, but it still had a major carbon build up, the best way to get rid of it is to 4 wheel in deep sand or tow a heavy load at high speed up hill.

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    Pewter
    2001 Silverado

    you may want to check out another forum. i often check out pickuptruck.com

    do a search on cold start knock. you'll find many remedies of what other people have tried.

  6. #6
    Senior Member Tyler_LS1's Avatar
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    Pewter
    1999 Camaro SS-M6 #1775

    my is the same way on a cold start check sig for info..
    1999 Camaro SS/ Pewter/ #1775 - LS1 6-speed - Predator 3 Custom Tune - Pro 5.0 - LS7 Clutch - 3.90's - Koni's - Strano Springs and Sway Bars - SFC's - Full UMI Chassis and Suspension - LS6 Intake PnP TB - ARH LT's and Kitty Ran Away - Magnaflow.

    12.6 at 112

    http://www.fquick.com/Tyler_LS1

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