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Old 06-30-2008, 07:01 PM
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Cylinder misfire

#3 cylinder misfires from time to time. It can also clear itself up. New HEI distributer, cap, rotor, coil and wires. When I pulled the plug it was wet. I cleaned it and reinstalled. I pulled the valve cover and put compressed air into the plug hole and cylinder. Both valves seem to seal ok. I removed the valve spring on the exhaust valve and checked the valve for it's fit in the guide. Doesn't appear to be sticking. I also tapped the valve after the spring was reinstalled to see if there might have been a piece of carbon or something.

The misfire is annoying and I'm not sure what to do next.???

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Old 06-30-2008, 07:29 PM
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Could be as bad as a cam going bad.........and could be as simple as a bad plug or wire.
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Old 06-30-2008, 07:58 PM
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I would try plugs first since that is the cheapest....if you don't even have any extra plugs around just switch two of em and see if the misfire carries over to the other cylinder....if #3 still misfires, I would take a look at the lobe on the cam.
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Old 06-30-2008, 08:08 PM
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yeah copy that!

a hair line crack on the ceramic part of the plug could cause a miss.
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Old 07-01-2008, 07:37 AM
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My jeep had 75,000 miles on it and the original plugs.....kept throwing a CEL for p0303 (cylinder 3 missfire) pulled the plugs and they looked brand new, except for cyl 3 which had a black streak up the ceramic insulator.
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Old 07-01-2008, 08:48 AM
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Or a bad wire.
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Old 07-01-2008, 03:32 PM
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he has new wires
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