Knock,knock

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

  1. dfhollums

    dfhollums Rockstar 100 Posts

    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 2 Years 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 4 Years ROTM Winner 5000 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 100 Posts

    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 Rockstar 100 Posts

    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 2 Years 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.
     

Share This Page

Newest Gallery Photos