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Thread: Another knock

  1. #1

    Default Another knock

    Hi, I am new to the forum and was wondering if I could get an answer on a common problem with the nbs trucks. I have had two 2002 chevy silverados (4.8/5.3) and on start up sometimes it will make a knock sound. I'm not talking about piston slap, just a one time knock. Every nbs I've seen does it but I was wondering If anyone has found a solution? My truck has 160000 on it so its not to old. Thanks for any help

  2. #2
    Legend

    Join Date
    Sep 2010
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    everett, massachusetts
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    Default

    Quote Originally Posted by 2002silverado5.3 View Post
    Hi, I am new to the forum and was wondering if I could get an answer on a common problem with the nbs trucks. I have had two 2002 chevy silverados (4.8/5.3) and on start up sometimes it will make a knock sound. I'm not talking about piston slap, just a one time knock. Every nbs I've seen does it but I was wondering If anyone has found a solution? My truck has 160000 on it so its not to old. Thanks for any help
    my 2000 5.3L has no knocking sounds on start up but I have been using mobil 1 synthetic since the vehicle had 10,ooomi on it. now at 140,000mi still a quiet engine in warm weather . when cold and in drive for the first 2 minutes ,I do get some piston slap under 30 deg f and sitting for a few hours .


    IF I allow the engine to run for 3 minutes before driving there is no noises ..

    What oil and filters are you using ... ?

  3. #3

    Default

    I believe Fram with conventional

    - - - Updated - - -

    I believe Fram with conventional

    - - - Updated - - -

    I know someone has to know what I'm talking about. 8 out of 10 do it

  4. #4

    Default

    My 2002 6.0 does the same thing on start up. I run mobil 1 synthetic. I do how ever use fram filter, but will be switching to ac delco next oil change. I have 166,000 on the truck.
    02GMC2500 4X4 extcab.Kenda Mud tires.3"Magnaflow true dual Exhaust.throttle body spacer with K&N air filter.Hypertech programmer.White LED dash lights.LED back up lights and marker lights.LED cab lights.LED interior lights.6000k HID conversion lows, with high/low conversion.Installed Center Console

  5. #5
    Legend

    Join Date
    Sep 2010
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    Default

    Quote Originally Posted by 2002silverado5.3 View Post
    I believe Fram with conventional

    - - - Updated - - -

    I believe Fram with conventional

    - - - Updated - - -

    I know someone has to know what I'm talking about. 8 out of 10 do it
    you answered your own question with the oil products used.

    I do not use or recommend any Fram or conventional oil in these GM engines.

  6. #6

    Default

    As rav said he has the same problem while using synthetic an I got a chance to get under the truck last night while changing u joint and getting rid of the infamous chevy stop and go clunk and its not farm it's the white with blue letter one. Can't think of the name had oil changed 1000 miles ago

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