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2004 DF140 IAC Adjustment Help Needed

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  • 2004 DF140 IAC Adjustment Help Needed

    Motor cranks instantly, smooth idle and runs out good to 5800rpm,
    Will run perfectly for any distance, then as you slow down to idle/neutral it knocks off .....will instantly crank right up and run good all over again
    Everything I read points to IAC valve, throttle plate is clean, new plugs, new filters, VST is spotless, etc.
    Noticed it idles at 800 rpm and that's high according to specs
    Bought new IAC valve and followed instructions to calibrate/adjust it to the 650 rpm idle
    turn the adjustment screw until tach goes over 1000 and I get the beeps and the duty cycle thing is in effect,
    I set the idle to 650 rpms while still beeping, bump throttle up to take it off duty cycle and all goes just as the directions describe perfectly.
    Then motor goes right back to 800 rpms, the adjustment is not staying in place.
    Have you seen this before? I don't believe i bought a new bad IAC valve, I read a post where someone described the exact same issue and said they changed the ECU and it fixed it.
    Thanks

  • #2
    Anyone have or heard of a Suzuki IAC idle reset procedure that won't take?
    Have tried two IAC valves. Motor runs perfect other than knocking of when coming back to idle/neutral
    Thanks

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