Question about 1999 Chevrolet Silverado 1500

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Knocking sound when engine is hot

I have a v-6 engine that is making a loud tapping sound when the engine is at normal operating temp.The noise is not heard when the engine is cold only when it is hot.When stopping to park the noise is heard in Drive,Reverse,and Park it is quite loud. The truck runs fine except for this noise.Help! This is a reman engine I just put in a few months ago.

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  • 645 Answers

Sounds like car has been overheated and has a collapsed piston skirt. This will cause piston slap until piston heat up and expand.-------------------------------------------------------------------------
vas 5054a

Posted on Dec 03, 2012

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6ya6ya
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Posted on Jan 02, 2017

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SOURCE: 2004 Aveo Unknown will not start

Daughters 2004 Aveo stopped dead on freeway. Plastic thermostat on engine and melted off. Chevy said it blew the engine, searched on line and found 17 pages of same complaint. Chevy repaired car for free. Still not worth the worry. But if this is your problem, fight it don't pay for repairs!

Posted on Oct 15, 2008

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SOURCE: 2004 chevrolet impala makes "popping"

check the spark plug confi they might be wired wrong

Posted on Mar 03, 2009

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SOURCE: Lifter noise

This is a very common issue with General Motors. I have never bothered to try and fix it because it is not causing any harm. It is because General Motors still uses a push rod motor and the cold oil causes it to knock a little until the oil gets warmed up.

Posted on Aug 05, 2008

rouseinator2
  • 24 Answers

SOURCE: 2000 chevrolet tahoe - can't put the gear stick in

It sounds to me as if the cable isnt adjusted properly. I would check with the shop that put the tranny in and see if they could check the adjustment on the cable, more than likely when they put in the new trans they didnt bother to adjust the cable for the replacement transmission

Posted on Mar 05, 2009

  • 65 Answers

SOURCE: 1991 Caprice No reverse. Moves in neutral. All forward gears OK.

shift linkage needs adjusting,,could be bent, easy fix, located along firewall to fram beneath the column, ask your son wut he ran over and didnt tell u about... hope i could help...:)

Posted on Mar 23, 2009

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Why is my 2002 Mazda Tribute making a loud knocking noise when I start it


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Hard to say over the internet but I will try to explain. If the noise is a distict KNOCK KNOCK and it sounds like it is coming from the bottom of the engine, then it most likely is a rod or main bearing. If it is a TAP TAP noise that sounds like it's coming from the top of the engine, then most likely a valve lifer is failing/failed.
the fact that it goes away when the car is warm, makes me lean towards a bad lifter. Normaly if a bearing is bad and knocking, the noise doesn't go away.

The KNOCK noise will be somewhat hollow sounding and the TAP TAP sound will be more solid. If the KNOCK KNOCK is solid, then a rod or main bearing has most likely failed to the point that a new/reman engine will be needed.

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