Chevrolet Repair Questions? Ask a Mechanic for Answers ASAP
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These vehicles have alot of problems with wiring to knock sensors. Disconnect the knock sensor pigtail harness on the back of the intake and check for 100K ohms resistance to ground on both sensors. If off replace knock sensor, if good replace wiring as needed. Let me know if you have questions, thanks.
need help on a 1999 Chevy K3500 pickup with a 7.4 L