2001 Chevy Silverado Engine knocks

ANNIE

MEMBER
2001 CHEVROLET SILVERADO
V8
2WD
AUTOMATIC
20,700 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

4 Replies

AUTOFIXER2

MEMBER
29 POSTS

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

DENNYP

MECHANIC
1,824 POSTS

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

ANNIE

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2 POSTS

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

DENNYP

MECHANIC
1,824 POSTS

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