Mechanics

CHEV MISFIRE

1997 Chevrolet Silverado • V8 4WD Automatic • 177,000 miles

1997 Chevy 1500 5.7 V-8
I have that notorius misfire problem. It doesn't misfire when @ idle. Usually at 60 or 70mph. It's been to the dealership 3 times now with no results. I have replaced plugs, wires, cap, and rotor. I have also ran fuel injector cleaner through it. Just bought a new ignition control module. Still misfiring. Any ideas?
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Deric812
January 6, 2011.




Check yoru fuel pressure. 55-60 psi is the spec and that cancause one as well.
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Hmac300
Jan 6, 2011.
I forgot to add that it doesn't do it all of the time. It is very inconsistent. With that beign said, do you still think it could be a fuel pressure problem

Tiny
Deric812
Jan 7, 2011.
Misfires can be cause by multile things, low fuel ressure, vacuum leaks, ignition or compression problems as well as injector problems. Check fuel pressure, even a coupleo f psi off will cause this and get choke cleaner and spray around intake for leaks.

Hmac300
Jan 7, 2011.
The fuel pressure is good. I had my intake gasket changed in early 2010 so I dont think I coukd be that.

Tiny
Deric812
Jan 8, 2011.

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