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  1. #1
    spray&Splash2011's Avatar
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    2004 Polaris MSX 150 no spark no start ****Help****

    I have a 2004 polaris MSX 150 that will not start, I believe due to no spark. The ski ran just fine before storage last winter, but when I went to start it up this spring the engine just turns and does not fire. I did the whole engine turns will not start trouble shoot checklist but everything checks out. Finally, I took the spark plugs out and grounded them to the engine and there is no visible spark. I believe the problem may stem from ecu 300, starter relay or the system IFB. I decided to start with the more affordable parts, so I have ordered a new SIFB, starter relay and now awaiting delivery. Any suggestions or input as to how to remedy the issue would be greatly appreciated.

    Regards,
    Rod


  2. #2
    Click avatar for tech links/info, donation request K447's Avatar
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    Welcome

    Did you measure the battery voltage while cranking the engine? Should be well over 10.6 volts while cranking. If not, replace or charge the battery.

  3. #3
    spray&Splash2011's Avatar
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    Hey K447, yeah when fully charged the lowest the battery voltage drops down to while cranking is 11.20 Volts. In addition, I have checked all the fuses and everything checks out.

  4. #4
    spray&Splash2011's Avatar
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    HELP!!!!! I bought a new SIFB, spark plugs, starter relay and still no luck. The engine still just turns over and primes with no spark or fuel coming out of the injectors. I have tried disconnecting The PPU ASM but it doesn't seem to make a difference. In addition, I tested the voltage at the ignition coil connectors and there is 12 volts present but still no visible spark when I ground the spark plug while cranking. Could it be the crank phase sensor or voltage regulate that are bad? What sensor tells the engine when to spark and send fuel? Any help would be greatly appreciated

    Regards.
    Splash

  5. #5
    Kosh's Avatar
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    Hi Rod,

    The ECU switches ignition and fuel to ground neither will work if battery voltage is to low.

    unclip the ecu and speed sensor plugs and check for corrosion. Both speed sensor and cam phase sensor feed input to the ECU. You will still get ignition with the cam phase unpluged, I doubt if you would without the speed sensor.

    Horror photos (glad it was not mine)
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  6. #6
    spray&Splash2011's Avatar
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    Kosh your the man! The speed sensor connector pins were completely corroded, it fired right up after cleaning and applying de-electric grease.

  7. #7
    This looks interesting. Will be checking mine today

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