5.3l engine knock

[hayhauler71]

disconnect the 2 pin connector on the top of the intake for the knock sensors [blue wires] ohm each wire to ground should have 93k to 107k ohms if not in spec remove the intake and check the wiring to the sensors or possibly water down in the holes where the sensors are. gm technical service bulletin 02-06-04-023a

[1966Stepside]

Originally Posted by hayhauler71

disconnect the 2 pin connector on the top of the intake for the knock sensors [blue wires] ohm each wire to ground should have 93k to 107k ohms if not in spec remove the intake and check the wiring to the sensors or possibly water down in the holes where the sensors are. gm technical service bulletin 02-06-04-023a

I was planning on trying to do this tomorrow, but I didn't know where to check the wires at. I am afraid that the wiring harness is bad, is there a way to differentiate between bad harness and bad sensor?
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[hayhauler71]

Originally Posted by 1966Stepside

I was planning on trying to do this tomorrow, but I didn't know where to check the wires at. I am afraid that the wiring harness is bad, is there a way to differentiate between bad harness and bad sensor?
Posted via Mobile Device

if the ohm test fails the intake has to come off any way. then you can test the harness and the sensors

[5150.4.67]

Could be harmless piston slap as well............at least concerning noise.

[60ratrod]

not to hijack this thread, but are 5.3s prone to piston slap? i think my tahoe has a case of it, goes away after either a couple minutes of warm-up idle or about a 1/16th of a mile. and the motor has to be dead cold for it to happen

[usmcchevy]

5.3s and 6.0s are pretty prone to cold start knock. They just knock for the first min or two in the morning. In 03 they started putting a coating on the piston side skirts to help.