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  1. #1
    thompsdw's Avatar
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    Idle Speed After Installing New Supercharge Wheel

    This is gonna be a dumb question, but here goes. I changed from a stock wheel to a green wheel (Riva Stage 2) in my 04 RXP. I didn't change any of the throttle body settings after the rebuild, because the manual says that the idle speed it not settable and is maintained by the ECM.

    IDLE SPEED (this is from the service manual for '05)
    The idle speed is not adjustable. The ECM controls the idle speed of the engine.

    I think I should adjust the idle speed because I was way high on the trailer and almost uncontrollable (at idle) in the water. Am I missing somthing here. Looks to me like lossen the cable and then retract the idle speed stop on the throttle body.


  2. #2
    rangermtb5's Avatar
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    What RPM was it idleing at?

  3. #3
    thompsdw's Avatar
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    6,000 or so. Way too high.

  4. #4
    rangermtb5's Avatar
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    Quote Originally Posted by thompsdw View Post
    6,000 or so. Way too high.
    vacuum leak. make sure the SCer to TB hose is tight. clamps tight

  5. #5
    HardmanGT's Avatar
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    Quote Originally Posted by rangermtb5 View Post
    vacuum leak. make sure the SCer to TB hose is tight. clamps tight
    +1

  6. #6
    thompsdw's Avatar
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    Quote Originally Posted by rangermtb5 View Post
    vacuum leak. make sure the SCer to TB hose is tight. clamps tight
    Ok, that is really the only hose that matters on a supercharged ski right?

    Back to my original question - one should never mess with the idle settings (mechanical adjustment) on these skis???

  7. #7
    HardmanGT's Avatar
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    Quote Originally Posted by thompsdw View Post
    Ok, that is really the only hose that matters on a supercharged ski right?

    Back to my original question - one should never mess with the idle settings (mechanical adjustment) on these skis???
    No need to play with the settings

    Did you rebuild the engine or just the supercharger and upgrade the wheel? Just want to get a better understanding of what you may have taken apart that could be leaking

  8. #8
    thompsdw's Avatar
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    I did a complete engine rebuild with a supercharger rebuild (by Jerry) and the new greenwheel. I just purchased a new set of hoses. The ends on the ones I have are pretty expanded.

  9. #9
    The hose going into the TB doesn't affect idle speed. The ECU controls the idle speed by opening and closing the idle speed control valve in the throttle body to only allow enough air to keep it at 1800 rpm idle. If you have a bad ISC valve, a leak at the TB to manifold gasket, a leak from the manifold gasket to head, a leak at the intercooler opening, or a cracked manifold, then you will admit too much air and the idle speed will be too high.

    You have something really wrong for it to idle that high.

  10. #10
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    Quote Originally Posted by thompsdw View Post
    6,000 or so. Way too high.
    6000 is way too high for a vacuum leak,especially in the water with a load. Your cable is too tight...pull the tube off the throttle body and see if the butterfly is closed all the way. Its probably open half way.

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