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  1. #1
    Airframe89
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    2003 MSX 140 Issues

    Last season the ski was running great, then started missing off and on again intermittently. Finally it just would not run right. I replaced the TPS, reseated all connectors, checked compression, checked fuel pressure, changed plugs and parked it for a military deployment and winter.
    Have had a couple weekends in the +70 temp range, have started troubleshooting it again.... still no joy... even changed the TPS again.

    - Idles correctly and does not miss

    - Throttle has dead spots and will not rev past 5500 rpm (in the water)

    - At 45 MPH it has a sweet spot where it will run (about 5300 rpm) any additional throttle and it dies, any less throttle and it misses/runs rough

    Changed TPS x2
    Fuel Press 25psi
    Changes Plugs (old and new are the correct ones)
    Cleaned and inspected all connectors
    Good even compression across all 3 cylinders
    Cleaned all grounds

    Any help would be appreciated!


  2. #2
    Click avatar for tech links/info, donation request K447's Avatar
    Join Date
    Jul 2007
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    My guess is that the EMM needs repair.

    See my signature links for contacting DFI Technologies.

  3. #3
    Airframe89
    Join Date
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    Thanks K447, I was afraid you were going to say that. DFI replaced the EMM power supply about 2 years ago when I purchased this ski as a winter project. You helped me out with the same advice then.

    Thank You.

  4. #4
    Click avatar for tech links/info, donation request K447's Avatar
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    If DFI repaired the EMM before, they may be willing to support you with this current problem. Give them a call and see what they say.

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