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Knock,knock

Discussion in 'Chevy Silverado Forum (GMC Sierra)' started by dfhollums, Nov 17, 2012.

  1. dfhollums

    dfhollums Rockstar

    About 8 months ago upon first start up of the day of my '00 Silverado (5.3 V-8), or even after sitting a while having a chance to cool, I hear a light knocking sound coming from the engine. It goes away after the engine is warmed up and the fluids have had a decent chance to circulate, but the knock has gotten worse either. What do you reckon?:neutral:
  2. 1953bowtieguy

    1953bowtieguy Member 1 Year 500 Posts

    Have you checked your timing? Cuz if the timing is "Retarded" to far it can do that.
  3. Pikey

    Pikey Moderator Staff Member 2 Years ROTM Winner 1000 Posts

    It could be piston slap or a rod knock. My 02 would knock when it was really cold out until the motor warmed up. I would let it idle until the knock stopped and then drive, it did not get worse over time though
  4. dfhollums

    dfhollums Rockstar

    You described my truck's problem to a "T".

    - - - Updated - - -

    I never thought about the timing, but I will give it shot. Mr. Plikey described my truck's problem to a "T".
  5. redvett

    redvett Member

    Timing on any GM truck engine after 1995 is computer controlled.You have the cold start knock and its just fine.

    - - - Updated - - -

    I never thought about the timing, but I will give it shot. Mr. Plikey described my truck's problem to a "T".[/QUOTE]
  6. stchman

    stchman Active Member 1 Year 1000 Posts

    What oil filter do you use? I've had Chevy trucks for some time and unless I used a GM oil filter, I got a brief knock on start-up.

    If you don't use an AC PF-48 I highly suggest you do as they cost about the same.

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