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  1. #1

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    2003 msx 140 wont go over 30 mph.

    Ski ran good for half hour then would not go over 30 mph 4000 rpm's and would not stay idling, got it home and hooked up hose to rinse and would hit 6500 rpm's but would not stay idling. Suggestions greatly appreciated. Heading out for spring break in a few days would be great to have 2 working skis, 1 ski for a family of four is tough.


  2. #2
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    Check your fuel pressure. I bet the regulator fell off in the tank.

  3. #3

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    Had 24 psi while running, after work today going to drain fuel and clean injectors and lines then put some new fuel back in, and test.

  4. #4
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    I would suggest checking or replacing the TPS then if fuel pressure is ok. Swap in the TPS from the good running ski to see if it makes a difference. If you unplug the TPS will it start and idle?

  5. #5
    Click avatar for tech links/info, donation request K447's Avatar
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    Don't mess with the Ficht injectors. Rarely fail, rarely need service.

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    Finally got a chance to swap the TPS sensor and take on the water, unfortunately problem stayed with ski.

  7. #7
    Click avatar for tech links/info, donation request K447's Avatar
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    Quote Originally Posted by hubsta View Post
    Finally got a chance to swap the TPS sensor and take on the water, unfortunately problem stayed with ski.
    Fuel pressure still good?

    Correct NGK PZFR6H spark plugs installed?

    CN you use the throttle lever to hold the engine just above idle RPM?
    How little throttle is needed to keep the engine running?
    Does it run smoothly or roughly at near idle RPM?

    Make sure the connector for the TPS is internally clean. There should be zero dielectric grease on the TPS connector pins or mating sockets, just a thin layer smeared on the flexible perimeter seal. Use zero residue electrical contact cleaner spray to clean the contacts, if necessary.

    Find a place to connect your voltmeter into the White/Red wires. Do not unplug an injector. Black meter probe to engine ground.

    Injector voltage should be stable at around 45 volts with engine running and only minor voltage variation with RPM changes.

    If you can, hook up inline spark testers to all three spark plugs. See if spark becomes intermittent or goes away when you let the engine attempt to idle.

  8. #8

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    Quote Originally Posted by K447 View Post
    Quote Originally Posted by hubsta View Post
    Finally got a chance to swap the TPS sensor and take on the water, unfortunately problem stayed with ski.
    Fuel pressure still good?

    Correct NGK PZFR6H spark plugs installed?

    CN you use the throttle lever to hold the engine just above idle RPM?
    How little throttle is needed to keep the engine running?
    Does it run smoothly or roughly at near idle RPM?

    Make sure the connector for the TPS is internally clean. There should be zero dielectric grease on the TPS connector pins or mating sockets, just a thin layer smeared on the flexible perimeter seal. Use zero residue electrical contact cleaner spray to clean the contacts, if necessary.

    Find a place to connect your voltmeter into the White/Red wires. Do not unplug an injector. Black meter probe to engine ground.

    Injector voltage should be stable at around 45 volts with engine running and only minor voltage variation with RPM changes.

    If you can, hook up inline spark testers to all three spark plugs. See if spark becomes intermittent or goes away when you let the engine attempt to idle.
    Fuel pressure still looks good. Yes correct plugs.
    It cranks and idles fine at start but after throttling several times, it will shut off but will crank and idle once again until throttling again. Checked and cleaned TPS sensor, my voltage on injectors were steady 45vdc changes with rpm were in the tenth. I hooked up inline spark tester and at idle light flickered in the millisecond range and steady with rpm rise.

  9. #9
    Connecticut CrazyA's Avatar
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    How many hours on this '03 ?

  10. #10
    Click avatar for tech links/info, donation request K447's Avatar
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    Quote Originally Posted by hubsta View Post
    Quote Originally Posted by K447 View Post
    Quote Originally Posted by hubsta View Post
    Finally got a chance to swap the TPS sensor and take on the water, unfortunately problem stayed with ski.
    Fuel pressure still good?

    Correct NGK PZFR6H spark plugs installed?

    Can you use the throttle lever to hold the engine just above idle RPM?
    How little throttle is needed to keep the engine running?
    Does it run smoothly or roughly at near idle RPM?

    Make sure the connector for the TPS is internally clean. There should be zero dielectric grease on the TPS connector pins or mating sockets, just a thin layer smeared on the flexible perimeter seal. Use zero residue electrical contact cleaner spray to clean the contacts, if necessary.

    Find a place to connect your voltmeter into the White/Red wires. Do not unplug an injector. Black meter probe to engine ground.

    Injector voltage should be stable at around 45 volts with engine running and only minor voltage variation with RPM changes.

    If you can, hook up inline spark testers to all three spark plugs. See if spark becomes intermittent or goes away when you let the engine attempt to idle.
    Fuel pressure still looks good. Yes correct plugs.

    It cranks and idles fine at start but after throttling several times, it will shut off but will crank and idle once again until throttling again.

    Checked and cleaned TPS sensor, my voltage on injectors were steady 45vdc changes with rpm were in the tenth.

    I hooked up inline spark tester and at idle light flickered in the millisecond range and steady with rpm rise.
    The first thing I would change is the TPS. The original TPS are known to go bad over time. The current replacement new parts seem to be more reliable.

    A bad TPS can cause all sorts of weird symptoms, including what you describe.

    Until you have a new or known good TPS in there we would just be guessing in terms of further diagnostics.

    It is possible the trouble is elsewhere, of course. Just hard to tell since the current TPS is not known to be good.

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