I have a knock but only when accelerating at high rpm ,does not do it all the time changed both tensioner so idler pulley plug wires plugs ,does not do it when idling
so is it a rod knock or a pre ign/over advanced/low octain gurggle??
Don't not know dealer can't even answer that
See if it'll do it when the engine is not under load (in park). If so it's a bearing. HTH. - Jim
Does it mainly when ac is
Then it's most likely the a/c compressor. HTH. -Jim
It still does it with ac belt off
Sounds like it comes from alt. But pulley is tight ,could it be possible that it is bad inside
If you still have the knock with the belt(s) off it's going to be a bearing in the engine. HTH. -Jim
Turned out it was the fuel line vibrating on fire wall
Looking for a Used Silverado 1500HD in your area?
CarGurus has 272 nationwide Silverado 1500HD listings starting at $3,450.
Search Chevrolet Silverado 1500HD Questions
Chevrolet Silverado 1500HD Experts
Related Models For Sale