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  1. #1

    Default 9.8 drops cylinder

    Hi all,

    I have 1983 Mercury 9.8 model 110 that runs and idles welll. Occasionally it will drop a cylinder and run on one. The other cylinder will randomly start firing again for awhile then quit again and so on. New spark plugs so I'm fairly sure thats not the issue.

    Any thoughts where I should start? I'm thinking of replacing ignition coils and wires. Could it also be the stator or cdi? Which is more likely/common?

    Thanks for reading and offering help. I enjoy working on my motors and I'm learning.

    J

  2. #2
    Join Date
    Sep 2010
    Posts
    24,647

    Default Re: 9.8 drops cylinder

    Do a " maximum spark " test.-----See if spark can jump a gap of 3/8" or more on a test device.

  3. #3

    Default Re: 9.8 drops cylinder

    Thanks for the reply. Next question is what will the results of that test tell me?

  4. #4
    Join Date
    Sep 2010
    Posts
    24,647

    Default Re: 9.8 drops cylinder

    Just do the test and report the results.-----If spark jumps that gap then all is OK !

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