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2003 5.3 P0300 Assistance
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Question
jwh463
I have had a P0300 since about August of 2011 94k miles, rough idle, somewhat worse MPG but beyond that it doesn't run bad. It uses no oil between changes and I have never used anything but Mobil One. I occasionally get a P0305. Last August I took it to the local dealer and they wanted to tear down the motor. Their report:" customer states CEL is on, low compression on #5. Misfire on #5, swapped ignition coil, spark plug and plug wire. misfire remained on #5. performed inj. bance test and all inj drop the same. found low compression on #5 125psi cust declined tear-down and inspect"
Now with 102K miles, code still there and I can't pass state inspection. The catalyst monitor and Evap Sytem Monitor will not will show ready, I can pass if one of those 2 will show ready. I have a code reader and can reset the P0300 code it it will not reappear unless it idles longer than 3 or 4 minutes.
Now since August I have replaced the follwing:
I even replaced the ECM (spare ecm store on ebAy ) and nothing changes
Running out of ideals with out going ahead and allowing a tear down starting with possible valve spring replacement. Is the code associated with the 2 failed inspection items? I have to get a state inspection to be able to park my truck at work.
Ideals?
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