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Misfire on number one cylinder sometimes runs fine

I have 96 chevyZ71 with4.3v6 most of the time it has a bad miss on number one cylinder but sometimes it runs just fine when it is missing it gets terrible gas mileage

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  • 43 Answers

Hello David I assume.
Was wondering if that is an engine code you are reading ? Aswell did this issue just randomly start ?

Posted on Oct 13, 2013

  • davidoliveaux Nov 30, 2013

    Yes this was a code you can also pull the wire with engine running -no fire i have even swapped the plugs around , nothing wrong with plugs installed new distributor with cap wires rotor map sensor plugs number one injector still has plenty of power no smoke sometimes this truck runs fine but most of the time it has a miss

  • G8or8 Nov 30, 2013

    I would perform a compression test, first dry if low compression do wet copression test. I suspect you may see low compression on nuber 1 cylinder. However if all cylinders are within 10 percent of each other I would tend to conclude your problem is fuel delivery.

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