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  1. #1

    Default Knocking sound when starting...loudest when engine is cold

    2001 k1500 5.3 with 104,000 miles. Started several months ago when engine was started but would get quiet after 10 or 20 seconds. Now it knocks longer and louder but does eventually get quiet. Sounds louder than a lifter. I'm wondering if a piston. I bought the truck about 4 or 5 years when it had 56 thousand on it. Truck looked new when I bought it and did not notice and problems with engine. Since then it has gotten fresh oil every 3000-4000 thousand. Most of my miles are highway. And from the look of the truck I'd guess most of the previous owners mileage where highway.

    I'm bummed!!

  2. #2
    Jr. Mechanic ibmoses's Avatar
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    Default

    What oil are you using?

    Sounds like piston slap.

    Bert
    "Race Car Spelled Backwards is Racecar"

    03 Silverado 2WD extended cab 5.3 with towing package white/silver
    70GS455

  3. #3
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    dwill3015's Avatar
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    Default

    Welcome to the site! Check out THIS SITE for more info on piston slap.
    Darcy
    Washington State
    2006 Silverado 2500HD LT3 4X4 CC SB Duramax LBZ
    Tuff Country 6" lift, 35" Toyo M/T's on 20" Ultra Peacemaker wheels, Quadzilla Stealth2 programmer, Diamond Eye 5" cat-back exhaust, factory Special order color Yellow.

  4. #4

    Default

    this is commen in colder weather on silverado's i never seen these blow up what gm was doing was removing all the spark plugs and putting in top engine cleaner [nasty stuff ] leave in over night,crank it over with no plugs reinstall plugs.it takes some time to get started because it washes the cylinders down,it will smoke like crazy and then change oil to mobil 1 they clame that it carbon build up hope this helps

  5. #5

    Default

    I have used pennzoil or castrol.

    I'll contact the local gm dealer and tell them I think I have excessive piston slap and see if they come up with the carbon buildup remover solution.

  6. #6

    Default

    My 2000 Silverado has the knocking sound when I first start it up in the morning. It has a 108k on it and the knock doesn't last too long. I was told that the early 5.3's were build very loose on the clearances. After reading the site that Darcy posted above it must be true.
    Robert
    2000 Chevy Silverado LS Ext. Cab 5.3 2wd.
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    Plumbers and Pipefitters Kansas L.U. 441
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