2010 xl denali 6.0 P0300

[M3kanic]

Not sure if this is the infamous tps or not looking for some conformation or guidance. If someone could help me out?

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[M3kanic]

Just changed tps and spark plugs no change.

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[M3kanic]

Well with the auto cal I only pick up P0300 and with another code reader I get P0103 and P0301. When I pull the maf sensor plug nothing changes. When I pull the number 1 spark plug wire it runs worse.

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[M3kanic]

Sorry the title should say 6.2 can't figure out how to edit.

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[M3kanic]

Cylinder 1 has low compression

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[M3kanic]

Ok so now I have had time to think and look at it.

At first I was thinking it was a bad lifter. Because the spark plug was dark and covered in what smelled like fuel and the low compression but now that I have taken off of the intake and valve cover the rockers have full movement but injector and the runner were dry. So maybe an injector.

Come on guys over 100 views and no in put.

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[M3kanic]

Well there is definitely oil getting into that cylinder.

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[M3kanic]

So with all of your guys help we narrowed it down to the dod valley cover. Replaced it and drove it for a while and it seems to be good.

Again thanks for everyone's help.

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