1968 Mercury 500 #4 cylinder doesn't fire

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  • August 1, 2019 at 7:47 pm #180613
    grunt311
    Participant

      I have a 1968 mercury 500 and have noticed that #4 cycles run not firing. All cylinders have good compression at 130-135 pounds, all plugs are also working with good spark. Any ideas what would chase this. Plug is clean as the day I put it in and seems a bit wet when I pull them. I would assume it is getting fuel not sure why it doesn’t fire.

      Any Thoughts on this one?

      Thanks Nick

      August 1, 2019 at 11:07 pm #180625
      dave-bernard
      Participant

        US Member

        WATER will make them clean and not fire. bottom seal.

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