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  1. #1
    dubl-z's Avatar
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    MSX 140 won't idle all of a sudden..

    I am a huge Polaris MSX fan! I've had my ski since 2004 and rode it until a couple years ago until it was down on power and It had 100 hrs on it. I parked it and bought a Yamaha FZR and modded it out.. Nice ski But still liked my Polaris' handling and feel so I rebuilt the top end and it was awesome.. At least until I took it out one day and it ran perfect.. I turned it off to put it on the trailer and now it wouldnt idle? Thought it was my tps .. Replaced it.. No go, Then I did Keith's tester and received Air temp sensor code.. Replaced it No go! Pulled the CPS did an Ohms test 149 no good replaced it.. Still won't idle. I've got 26 psi fuel pressure, 135, 137, 136 compression test.. Disconnected the new TPS and it idled high.All I can think of is EMM went bad.. Looking for ideas or. Something I'm Missing.For kicks I checked the air temp sensors OHMs .. It's a brand new part .. Tested 1083 Ohms - service manual says 990-1010? Is that possible and can something be blowing my AT sensor?


  2. #2
    Click avatar for tech links/info, donation request K447's Avatar
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    You sure you have the correct air temperature temp sensor part number? What ohms did the old sensor read?

    What do you mean by 'idles high' when TPS is disconnected? What RPM?

    Correct park plugs installed?

    If everything else is good then now might be the time to have the EMM tested.

  3. #3
    dubl-z's Avatar
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    No idle

    Quote Originally Posted by K447 View Post
    You sure you have the correct air temperature temp sensor part number? What ohms did the old sensor read?

    What do you mean by 'idles high' when TPS is disconnected? What RPM?

    Correct park plugs installed?

    If everything else is good then now might be the time to have the EMM tested.
    Keith:
    Old air temp sensor reads 1039 ohms,
    Yes high idle without Tps connected.. Didn't think to get RPMs.
    Correct ngk PZFR6h plugs (new)
    Sent EMM to DFI last week..

    Let you know what DFI says

  4. #4
    dubl-z's Avatar
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    Keith:

    Just got off the phone with DFI.. EMM is Good.
    New Air Temp Sensor p/n# 2410299

    At this point Im at a loss.. Not knowing which way to go?

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