2001 Chevy Silverado Engine knocks

Tiny
ANNIE
  • 2001 CHEVROLET SILVERADO

Noises problem
2001 Chevy Silverado V8 Two Wheel Drive Automatic 20700 miles

I have a Chevy 1/2 4.8. I had replaced both knock sensors. After putting the engine back together it has a continous knocking noise upon start up (it didn't have that before taking it apart).

I bought and replaced the knock sensors (2) and the wiring harness.

I reassembled the fuel injection the opposite of which it came apart and proceeded with the rest.

Any assistance with this would be great.

Thanks Annie

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Tuesday, October 21st, 2008 AT 11:59 PM

4 Replies

Tiny
AUTOFIXER2
  • MEMBER

You said the knocking began after putting the engine back together. How deep did you go? Intake, heads, pistons, crank? What do you mean you say you reassembled the fuel injection opposite? The info could help.

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Wednesday, October 22nd, 2008 AT 12:18 AM
Tiny
DENNYP
  • EXPERT
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Why were the knock sensors replaced?
You could have dropped something down an intake runner.

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Wednesday, October 22nd, 2008 AT 11:53 AM
Tiny
ANNIE
  • MEMBER

Thank you Denny. It appears that a clip did indeed end up down in the runner.I suppose we should have the motor replaced. Thanks again

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Wednesday, October 22nd, 2008 AT 11:19 PM
Tiny
DENNYP
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If it was a metal clip, I would try to get it out with a magnet first. If it was a plastic injector connector clip, it should burn up in the cylinder pretty quickly. You can get a magnet in the spark plug holes. This would be a great time to have a boroscope handy.

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Thursday, October 23rd, 2008 AT 4:30 PM

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