Misfire

Asked by Weldum May 04, 2019 at 04:36 PM about the 1997 Chevrolet C/K 1500 Silverado Extended Cab RWD

Question type: Maintenance & Repair

I'm looking at a 1997 Chevy 1500.  Has a misfire in
cylinder 7 he has already changed plugs wires cap
rotor and fuel pump.  Ideas on what else could be
wrong

3 Answers
26,860

oilyspill answered 5 years ago

Did you visually check for spark at number 7? You used a gage and checked proper fuel pressure? I agree with the other person about fuel injector and compression. You might try a cylinder balance test, kill the cylinders, one at a time, fuel or spark. If you kill a cylinder that has no effect on rpms, that cylinder is dead, then you check fuel--spark--compression on that cylinder. It may lead back to #7?

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10

Thomas answered 5 years ago

Could be a stuck valve or possibly a bad spark plug. I would check the gap on the spark plug, then swap plug to another cylinder and see what it does.

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