Why does my 2001 Cheve Silverado 5.3 L make a knocking sound when started cold and then go away after it runs a minute or if it is driven a minute. The sound seems to come from the bottom of the motor or the tranny area and has been there since i bought the vehicle. It doesn't seem to be getting worse and someone suggested piston slap as the problem. Any ideas ?

Asked by Ratherfluffy Aug 15, 2013 at 03:27 PM about the 2001 Chevrolet Silverado 1500 LS Extended Cab 4WD

Question type: Maintenance & Repair

The fluids are good and the tranny is rebuilt too.

migration_judge_roy answered 10 years ago

a leaking fuel injector can dump gas....check the oil in your crankcase for evidence of fuel there...examine your injectors for leakage~

1 people found this helpful.

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875

LUVMYCHEVY answered 5 years ago

how many miles are on truck?

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F_O_R answered 5 years ago

Then again this could be a rod knock.

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Guru9BSGB4 answered 2 years ago

Probably the check valve in oil filter, well lack of just taking it longer to prime to top of motor. Was a issue in some early to late 90s trucks.

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Your Answer:

Why does my 2001 Cheve Silverado 5.3 L make a knocking sound when started cold and then go away after it runs a minute or if it is driven a minute. The sound seems to come from the bottom of the motor or the tranny area and has been there since i bought the vehicle. It doesn't seem to be getting worse and someone suggested piston slap as the problem. Any ideas ? 4 Answers

The fluids are good and the tranny is rebuilt too.

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my oil pressure went down to 0 and then i turned it off. its a 2001 chevy silverado. I turned it back on and it was fine. Then i started driving and it happened again and this time the engine shut off. Is there a safety feature that prevent the motor from seizing? 9 Answers

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