Loud knocking noise

10

Asked by Jun 10, 2017 at 06:40 AM about the 2000 Chevrolet Tahoe Limited/Z71 4WD

Question type: Maintenance & Repair

My tahoe has a bad knocking noise when it
runs & even when I turn the key on we've
changed the oil,spark plugs it dosen't seem
to be overheating or anything I been told it
could lifters or something with the oil pan
I'm not familiar with any of that I stopped
driving it because of the knocking. Could
more damage be done if I decide to drive it
or should I just leave it until we find out
where the noise is coming from??

4 Answers

74,725

A knocking noise is not good. Usually a rod knock indicating worn bearings on the crankshaft and push rods that drive the pistons. You definitely would cause more damage to the engine, be stranded somewhere when the engine throws a rod. So do not be driving it. The motor needs to be rebuilt or replaced.

2 of 2 people found this helpful.
10

Thank yu ^^^ your answer is most helpful I'll definitely do some research and learn how these auto parts work & such.. again thx

1 of 1 people found this helpful.
70,995

Could be a worn camshaft. A GM trouble spot! Definitely not worth fixing on a 17 year old vehicle. HTH. -Jim

My Tahoe did this, and EVERYBODY AND THEIR BROTHERS said I needed to replace/repair engine!! It ran too good for that. It turned out a heat shield was loose, and made a racket like a rod knockin...Had even one mechanic that said he felt the #7... All you do is take them loose, from the exhaust close to engine, and probably one piece at a time. Do this while the engine is cold. Overnight cold.

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