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Re: Miss-fire on 2003 6.0L
"We finally decided to try a compression check and on cylinder 5 at idle it read 45 pounds. When i rev it up some, it reads 65-70. On the good cylinder (3) it reads 80 (i think) at idle, and 125 or so when it is revved up (2500 RPM.)"
HUH?
You don't check compression with it running. As for the problem, maybe a vacuum leak in the intake tract between 3 and 4 ports? That should throw a lean code though. I don't know....Mechanic talking cylinder contribution maybe? If so they should all drop rpms the same, the ones that drop the least are obviously the worst cylinders, but you probably knew that.
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10 hours away from John Deere master certified
also master certified ASE tech. Exp. in both.
Went to school for cars, wound up staying with Deere dealer for a while, so schooling there too. Also couple years exp in GM and some GM training
Gave up wrenching for "Greener Pastures"
Current job: RN
2010 Silverado Z71 5.3L 65xxx
Wife's
2007 Suburban 1500 LTZ 5.3L 102xxx
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