2009 Silverado 5.3 misfire at idle on cylinder 4, goes away above 1300 roms

Asked by Guru95MJ5S Jan 19, 2021 at 01:18 AM about the 2009 Chevrolet Silverado 1500 LT Crew Cab RWD

Question type: Maintenance & Repair

Just curious if anyone has ran into this and had a fix, all the
lifters have been changed, new vlom, oil pressure sensor,
spark plugs and wires. Truck starts and has misfire on
cylinder 4. Once its above 1300 runs misfire goes away.  
Code is p0304.

3 Answers

Guru95MJ5S answered 3 years ago

Head gasket was replaced, injectors haven't been cleaned. Haven't done a Compression test yet. Whats a good average number for a 200k motor

Mark helpful

Guru95MJ5S answered 3 years ago

I pulled the head off and found that the lifters are different lengths about 1/16th of a inch shorter on that cylinder as they are a different brand. Not sure of this will solve my problem but I know that 6 lifters are a different brand then these to. So hoping thats a start compression was good both ways.

Mark helpful

Guru95MJ5S answered 3 years ago

No it has not been converted, the original owner said that he bought some online and the 2 shorter one from parts store. That the place online didn't have a complete set in stock, so idk. Putting it back together today, new gasket and bolts again so we will see.

Mark helpful

Your Answer:

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