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Idle out of control

Discussion in 'Motorcycle Tech Talk' started by David Alves, Aug 16, 2007.

  1. David Alves

    David Alves New Member

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    Need help on this one. 2001RK with True duals, SE slip on's, AC and PC with custom map. Bike was running fine till I noticed 2,000 rpms even on a hot engine start up. Idle would not return to normal till after going down the road for about a mile. When shutting the bike down for a minute or longer high idle returned again on start up. By the end of the day the RPM'S went to 3,000 and stayed there all the way home. I disconnected the PC and still revs at 3,000. Any idea won't went wrong?
    Last edited: Aug 16, 2007
    David Alves, Aug 16, 2007
    #1
  3. fxdxsteve

    fxdxsteve Active Member

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    need more info year model any mods mileage
    fxdxsteve, Aug 16, 2007
    #2
  4. kenfuzed

    kenfuzed Administrator Staff Member

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    Sounds like either a bad temperature sensor or stuck/faulty IAC (Air Intake Control) valve. The IAC is a stepped solenoid that allows more or less air into the intake to increase the idle during warm up or when otherwise needed. If it becomes intermittently stuck then your idle would race uncontrollably. Before replacing sensors or the IAC try moving or wiggling any of the wires leading to the sensors. Also its a good idea to see if any trouble codes were recorded.

    There could be other things at work here, but those are the items I'd check first.
    kenfuzed, Aug 16, 2007
    #3
  5. VYBR8ER

    VYBR8ER New Member

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    Before you get too complicated with this, check for a vacuum leak! Sounds like there is a good possibility that your intake seals are leaking. Spray a little carb cleaner or WD40 directly on the intake seals where they meet the heads. If the idle speed drops or motor stumbles you've got a leak and need to replace the seals.
    VYBR8ER, Aug 19, 2007
    #4

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