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

27,135

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.
70,295

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.
70,295

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

70,295

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

Your Answer

Silverado 1500HD

Looking for a Used Silverado 1500HD in your area?

CarGurus has 276 nationwide Silverado 1500HD listings starting at $3,500.

ZIP:

Chevrolet Silverado 1500HD Experts

  • #1
    madatmysuburban
    Reputation
    330
  • #2
    charlandk
    Reputation
    260
  • #3
    Drew6350
    Reputation
    210
View All

Related Models For Sale

Used Chevrolet Silverado 1500
2,137 Great Deals out of 167,424 listings starting at $1,900
Used Chevrolet Silverado 2500HD
318 Great Deals out of 29,131 listings starting at $2,995
Used Ford F-150
2,324 Great Deals out of 184,534 listings starting at $699
Used GMC Sierra 1500
886 Great Deals out of 65,682 listings starting at $1,995
Used GMC Sierra 1500HD
151 listings starting at $4,995
Used Dodge Ram 1500
362 Great Deals out of 10,960 listings starting at $1,500
Used Chevrolet Silverado 2500
6 Great Deals out of 259 listings starting at $2,900
Used Ford F-250 Super Duty
369 Great Deals out of 44,898 listings starting at $1,799
Used GMC Sierra 2500HD
111 Great Deals out of 13,517 listings starting at $2,999
Used Toyota Tundra
467 Great Deals out of 32,492 listings starting at $1,999
Used Dodge Ram 2500
153 Great Deals out of 5,015 listings starting at $2,999
Used Toyota Tacoma
634 Great Deals out of 43,276 listings starting at $1,500
Used Chevrolet Tahoe
649 Great Deals out of 39,641 listings starting at $1,000
Used Chevrolet Silverado Classic 2500HD
11 Great Deals out of 365 listings starting at $5,977
Used Chevrolet Camaro
426 Great Deals out of 30,915 listings starting at $3,550

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.