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  1. #1

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    2009 255 rxpx misfire under load

    Hi guys.

    My second ski has started misfiring and looking for advice on what it may be

    Was running fine for about half a day and then started misfiring under load

    Took it home and checked the cooler. Found it was leaking (not badly but noticeable) so ordered a new on.

    Put it in, and changed the plugs for brand new ones.

    Sitting on the trailer, it revs and idles fine, but misfires under load in the water.

    I can idle through the 5 knots zone no issues. Idles along fine.

    No errors codes.

    No water in oil.

    Looking for some suggestions on what I could try next before starting to randomly change parts

    Coil packs?
    Water left in manifold? (Unlikely I would think)

    Many thanks

    Dave


  2. #2
    Pressure test the new cooler.

  3. #3

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    New cooler has been pressure tested and is ok.

    I did take the coil sticks out today and found one of them to be a little rusted. Looks to me as though it’s mainly cosmetic though?

    Click image for larger version. 

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    Thoughts?

    Dave

  4. #4
    fx160's Avatar
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    How did you not notice that when you changed the plugs
    One thing it does tell you is
    That you have had water in there

  5. #5

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    Quote Originally Posted by fx160 View Post
    How did you not notice that when you changed the plugs
    One thing it does tell you is
    That you have had water in there
    This is a ski I bought in parts and have build over the last few months in my spare time.

    The coil sticks were second hand. Given the extremely short period of time I’ve had it (and the fact that I only bought the coil sticks a month or so ago) I would strongly suspect the rusty look was there before I got them.

    The reason I didn’t notice it is because it normally has a plastic cover over it (•look closely at the other stock in the picture). It wasn’t until I looked more closely at the stick that I saw the plastic cover was cracked. I took it off and saw the rusty part underneath.

    So, there is no water in the coil pack hole.

    My question was around wether anyone thinks this would impact performance of the stick, or if these covers are cosmetic.

    Once the rusty sheath is removed, it cleaned up looking ok.

    Dave

  6. #6
    fx160's Avatar
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    I would think it would affect performance
    The covers are for insulation
    So it would easily misfire

  7. #7
    There is the problem. I would suspect it’s misfiring at idle too but your just not noticing it.

  8. #8

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    Map sensor could be the problem???

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