Need some HELP. Misfire won't go away
06-10-2015, 04:05 PM
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Need some HELP. Misfire won't go away Well long story short I bought a 03 silverado at auction with a LQ9 in it and it had no oil pressure. I got a brand new motor to go into it got everything installed and back together and now I have a misfire and it won't go away. I have tried and tested everything. At idle everything is fine the moment it comes under a load with a rev it will start to misfire. I have no other codes besides random misfire. If you put it into drive it gets really bad and almost dies. Since the PCM wasn't telling me anything I put a timing light onto each coil pack plug wire, the light will start steady then when you put it into drive the spark basically is gone or at best a random blip here and there to keep it running really ruff. I have done all the usual things, plugs,wires, checked all my grounds, swapped coil packs out, new PCM, new 02's etc.... I have never seen a spark just drop off like that. It has me pretty stumped and aggravated . Anyone ever have these symptoms???? Anything would be helpful.
06-17-2015, 10:03 PM
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Well never got any help on here, but found the problem. It was a broken ground wire inside the wiring harness for anyone that runs into a similar problem