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  1. #1

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    Question polaris 140 msx wont rev over 3k

    Hi guy's

    I'm trying to help a friend diag his 140 msx polaris. the ski was running fine all day then all of a sudden it would not rev over 3k.
    We did compression check 125 across all cylinders, all plugs are black (rich) we have fire on all cylinders.
    I thought it might be fuel related so we connected a fuel pressure guage, and recieved no pressure indicated.
    We disconnected the fuel pump and the ski will not run, we reconnected the fuel pump and the ski will run but the ski acts as if it's trying to run away, (air leak).
    Is their a diag procedure to review the fault codes? Will a pump and/or low pressure kick a code?

    Thanks


  2. #2
    ph2ocraft's Avatar
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    What's the fuel pressure at the fuel fitting?
    Do you have a spare TPS you can plug in and try?

  3. #3

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    re fuel pressure

    I have 0 pressure.

  4. #4
    ph2ocraft's Avatar
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    That's what throws me, you state 0 pounds yet it runs. I didn't think it would push through injectors with 0 pounds.

    Anyway, what voltage do you have at the pump and have you checked for any restrictions in the fuel system?

    If you go to the tech section, you'll find the MSX140 service manual in the downloads, that should get you going.

    http://www.mattmans.com/polaris/upload

  5. #5
    ph2ocraft's Avatar
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    I forgot to ask, was the CHECK ENGINE lamp flashing?
    Maybe it threw you into SLOW mode.
    I know if you're running hot or your altrenator is putting out over 45 volts the SLOW will limit you to 3500RPM.

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