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P0300 code of death
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Question
6.0 agony
2001 HD2500 with 6.0 is giving me an almost constant flashing SES and the P0300 misfire code. Had a buddy hook it up to a Tech II and all cylinders except 2 were showing misfires and two were showing a large number(I can't remember which ones).
I had already changed the plugs before the scan. I was going to do the wires next until I saw almost all cylinders were showing a misfire. So, I had them do a crank relearn, no change. Then I changed the exhaust manifold as they were leaking, no change. Then I tracked down a vacuum leak in the EGR tube to the intake which I was sure was the issue, no change except smoother idle.
The odd part is the truck runs fine. Except a slightly rough idle before the vacuum leak repair I can't feel any misfires. I have a cheap scanner and I am getting + % on the long term fuel trims. About 4-5% through town and a steady 9.38% at 65 mph. Also, the before cat 02 sensors, and one after cat 02 sensor is reading 400-800mvs. The bank 2 after cat 02 sensor is reading 40-120mvs. To me, that says the cat is doing it's job as there is more oxygen and less fuel, but I have no idea if that is right logic. Plus, if there was a problem with bank 1 02 sensor or cat, wouldn't bank 1 fuel trim only be affected?
I also made sure there was no fuel in the regulator line and the truck hold fuel pressure for several minutes and has 54 lbs at idle.
Stumped.
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