Mechanics

CHEVY MISS FIRING CYL. #6

1996 Chevrolet Silverado

Engine Performance problem
1996 Chevy Silverado V8 Two Wheel Drive Automatic 160000 miles

I have an ODB ll reader that indicated #6 cylider was miss firing. I have changed plugs, wires, cap an rotor and still have same conditon with same fault code.
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TimHcali
October 13, 2008.



Have you checked compression on #6?

Tiny
James W.
Oct 13, 2008.
James has a good idea. Check the compression. However, compression can be OK and you could still have a broken valve spring, broken rocker arm, etc. If one of the valves will NOT open, the cylinder will not fire. If it's the INTAKE valve, no fuel/air can get into the cylinder. If it's the exhaust valve not opening, the burned mixture cannot escape therefore contaminating the new mixture entering the combustion chamber. Long story short. Check the valve train on that cylinder. Don't forget about the FUEL INJECTOR. If it's not firing, there's no fuel to that cylinder. If it's throttle body injected, never mind. If it's multi-port injected, check the third injector from the front on the passenger side. You can even swap it with, say, number 2 (front injector on pass. Side) and see if your code reader indicates number 2 now. Like I said, if it's throttle body injected, never mind. I can't remember what year they got away from that.

Tiny
Jasonray
Oct 17, 2008.