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

20,785

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

4 out of 4 people think this is helpful.
20

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

1 out of 1 people think this is helpful.
63,135

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

1 out of 1 people think this is helpful.
20

Does it mainly when ac is

1 out of 1 people think this is helpful.
63,135

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

20

It still does it with ac belt off

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

63,135

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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