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  1. #1
    Chris0060's Avatar
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    Rough Idle @ times, not able to hold 8100

    On my stage II RXP, I have experienced sputtering, hesitation, and when it does hit 8100, it suddenly drops to 6500-7500. AFR is set at 65.. Constant sputtering, RPMS's fluctuating under full throttle.

    In the past, It has run like this initially, then cleared up after 10 minutes of rough idling, low RPM's. Today and in the last 2 rides, it does this whenever.... Getting the ski to 8100 sometimes wont happen... Very annoying.
    Im stuck here guys...

    Im thinking water intrusion somewhere or fuel issue....

    Relevant Mods:

    X charger, 42's, RRFPR, JFizzle Intercooler..4 inch kanaflex, no air cleaner..


  2. #2
    mrbtd's Avatar
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    Sounds like the S/C is slipping.

  3. #3
    are you riding in flat or choppy water????

  4. #4
    Chris0060's Avatar
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    Quote Originally Posted by 2005cdoorxp View Post
    are you riding in flat or choppy water????
    Both...Flat water I cant get the ski to hold 8100... Sputtering, etc. @ times it is a very "jerky" ride, with the rpms fluctuating..

    Charger + slip was just checked...less than 3 hours ago..

  5. #5
    Richieb's Avatar
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    Battery may be dying. It can cause this symptom.

    IF you're sure the SC is ok of course.

  6. #6
    Moderator Snoman's Avatar
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    Bad plugs??Boost leak??

  7. #7
    zerowake's Avatar
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    injector?

    after instsalling an X charger and 42s my friend fired his up on the hose. it would spool right up to 8100 on the trailer but was sputtering bad in the water and not reving up at all. we pulled the fuel rail with the injectors attached and found one completely pugged up. Only 2 cylibers were getting fuel.

    you may have a partial clog in one or more of the injectors. in my humble experience working on these, fuel and spark seem to be the first reasons to cause "sputter"

    But you can't count out SC problems on these motors.

  8. #8
    Got Boost? psycho rxp's Avatar
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    AFR is set at 65
    DO U MEAN A rrfpr BASE PRESSURE IS SET @65? MAYBE TOO MUCH fuel, CAUSING FOULING OF THE PLUGS. I would get a new set of plugs, and try a base of 60psi.

  9. #9
    Having Fun jp1300r's Avatar
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    Do you have a fuel pressure gauge you can see while riding?

  10. #10
    Moderator Snoman's Avatar
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    Quote Originally Posted by psycho rxp View Post
    DO U MEAN A rrfpr BASE PRESSURE IS SET @65? MAYBE TOO MUCH fuel, CAUSING FOULING OF THE PLUGS. I would get a new set of plugs, and try a base of 60psi.

    Base pressure does look a little high,BUT unless he has checked it with an A/F guage that will be hard to tell...Fouled/bad plugs is what im thinkin..

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