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

20

Asked by Oct 16, 2015 at 10:35 AM about the Chevrolet Silverado 1500HD

Question type: Maintenance & Repair

10 Answers

28,705

so is it a rod knock or a pre ign/over advanced/low octain gurggle??

4 of 4 people found this helpful.
20

Don't not know dealer can't even answer that

1 of 1 people found this helpful.
74,095

See if it'll do it when the engine is not under load (in park). If so it's a bearing. HTH. - Jim

1 of 1 people found this helpful.
20

Does it mainly when ac is

1 of 1 people found this helpful.
74,095

Then it's most likely the a/c compressor. HTH. -Jim

20

It still does it with ac belt off

20

Sounds like it comes from alt. But pulley is tight ,could it be possible that it is bad inside

74,095

If you still have the knock with the belt(s) off it's going to be a bearing in the engine. HTH. -Jim

20

Thank you

20

Turned out it was the fuel line vibrating on fire wall

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