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  1. #1

    Join Date
    May 2012
    meadow lakes alaska

    msx 140ho starts and runs-- only idles while in water?????

    my msx140 has less than 80hours on it. It will start and rev rpms out of the water but when i put it in the water it will not do anything but idle. It started this by every once in a while it would just idle but then catch and run perfect after say 10 seconds. Now it just idles and if you give it full throttle it will die. The fuel pressure is above 20psi coming from the tank pump. Any ideas on what to check next??

  2. #2
    Click avatar for tech links/info K447's Avatar
    Join Date
    Jul 2007
    near Toronto, Canada
    My guess would be the TPS is failing.

    Have you checked cylinder compression?

    Correct spark plugs installed?

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