2005 VX110 Random cylinder misfire and no power
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  1. #1
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    2005 VX110 Random cylinder misfire and no power

    I bought this ski with 300 hours and no history. It has very rough idle and no power. The filter box is dry with no air filter installed. I checked compression with lowest at 145, high 162. When running the center 2 cylinders were not firing, as verified by cold clean plugs while other 2 were warm and semi-sooty. I swapped all 4 coils and plugs from my other properly running VX and ran again. I cleaned the plugs before I put them in so I could get an idea of firing or not. After about 10 mins of running on trailer, still no power but maybe slightly smoother. I pulled plugs this time to find the front plug clean and cold, with the rest warm and semi-sooty. I then put all 4 cloils/plugs back in good ski, and starts and runs fine.

    I did put the 4 coils/plugs from poorly running ski in to good one, and it ran bad so I know I need new coils and plugs, but this is not entire problem?

    I plan to pull fuel injectors next and check fuel pressure/ spray pattern.

    Any other ideas?

    Thanks

  2. #2
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    Re: 2005 VX110 Random cylinder misfire and no power

    I checked the injectors and all 4 have a nice spray pattern and no dripping. 51 psi at the rail.

    Any ideas?

  3. #3

    Re: 2005 VX110 Random cylinder misfire and no power

    so the connection that plugs into the MAS was a little corroded on mine and some days it ran great some days misfires... if you unplug it it should idle perfect... but cant rev,

  4. #4
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    Re: 2005 VX110 Random cylinder misfire and no power

    I'll give it a try, thanks

  5. #5
    PWCToday.com Is My Home Away From Home David3aces's Avatar
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    Re: 2005 VX110 Random cylinder misfire and no power

    New Spark Plugs? Seen it hundreds of times.

  6. #6
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    Re: 2005 VX110 Random cylinder misfire and no power

    Yeah I tried new plugs, and known good coils from another VX I have. Same issue.

    I'm wondering if it jumped time?

  7. #7
    PWCToday.com Is My Home Away From Home WFO Speedracer's Avatar
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    Re: 2005 VX110 Random cylinder misfire and no power

    Swap the fuel rail from the other ski and report back what it does.
    Y'all know me, still the same O.G. but I been low-key
    hated on by most these &^$$@s with no cheese, no deals and no G's, no wheels and no keys, no boats, no snowmobiles, and no skis, mad at me cause I can finally afford to provide my family with groceries

    WWSRD , What would Speed Racer do ?

  8. #8
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    Re: 2005 VX110 Random cylinder misfire and no power

    I can do that but may have to wait till spring!

  9. #9
    PWCToday.com Is My Home Away From Home Myself's Avatar
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    Re: 2005 VX110 Random cylinder misfire and no power

    Lay plugs WITH coils attached up on the head and check spark. The VX wiring harnesses are crap, I've replaced a few. I've also found bad/broken wiring going to various sensors AND to coils.
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  10. #10
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    Re: 2005 VX110 Random cylinder misfire and no power

    Got it, thanks!

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