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  1. #1
    Cadet
    Join Date
    Oct 2002
    Location
    Deltona, Florida
    Posts
    7

    Default 1998 Mercury 115 - RPM Problem

    My Mercury motor will not perform over 4,000 rpm. Could it be one of my CDM modules? Great site. Thank you!

  2. #2
    Admiral
    Join Date
    Aug 2002
    Location
    corpus christi texas
    Posts
    6,872

    Default Re: 1998 Mercury 115 - RPM Problem

    washedashore, First determine whether you are getting fire to all cylinders.

  3. #3
    Cadet
    Join Date
    Oct 2002
    Location
    Deltona, Florida
    Posts
    7

    Default Re: 1998 Mercury 115 - RPM Problem

    yes but not on #3

  4. #4
    Admiral
    Join Date
    Aug 2002
    Location
    corpus christi texas
    Posts
    6,872

    Default Re: 1998 Mercury 115 - RPM Problem

    Swap coil from known firing cylinder and see if it fires.

  5. #5
    Cadet
    Join Date
    Oct 2002
    Location
    Deltona, Florida
    Posts
    7

    Default Re: 1998 Mercury 115 - RPM Problem

    will give it atry tomorrow .hoping thats the problem thanks for your help.as a rookie boater this site sure help out alot.

  6. #6
    Cadet
    Join Date
    Oct 2002
    Location
    Deltona, Florida
    Posts
    7

    Default Re: 1998 Mercury 115 - RPM Problem

    thanks for the help.ichanged the cmd module and she runs great!

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