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

Question type: Maintenance & Repair

The fluids are good and the tranny is rebuilt too.

1 Answer

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

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