Mechanics

CHEVY CONSTANT MISFIRE

1996 Chevrolet Silverado

Engine Performance problem
1996 Chevy Silverado V8 Two Wheel Drive Automatic 180000 miles

I have a 1996 Chevy C1500 with a 5.0. This vehicle has a constant misfire. When I first got it it had a PO300 code. I did a full tune up. New wires, plugs, cap, rotor coil and ignition control module. I checked the fuel pressure and it was not within specs. I replaced the pump and filter. This still has not fixed it. What else could keep making this truck have a misfire code. Engine just shakes.
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Martwein
December 18, 2009.



P0300 Random Misfires normally caused by vacuum leaks and bad fuel

Misfires can be caused by worn or fouled spark plugs, a weak spark (weak coil, bad spark plug wire), loss of compression, vacuum leaks, anything that causes an unusually lean fuel mixture (lean misfire), an EGR valve that is stuck open, dirty fuel injectors, low fuel pressure, or even bad fuel.

Rasmataz
Dec 18, 2009.