Idle adjustment is through the ECM and factory set. If you are having idle issues there are potentionally a number of reasons why*. If you are just wanting to change your idle speed then you would need to purchase an interface such as the Screamin Eagle Race Tuner.
*IAC - Idle Air Control motor
Throttle Position Sensor
Injector malfunction
Intake Air Temperature Sensor
Just to name a few.
Testimonial: "Thanks for the input. They say it has some thing to do the vss or veichle speed sensor. Can I just put in a 5k ohm resistor in to the engine coolant"
SOURCE: Idel adjustment on fuel injected road king.\not on
Thats not totally correct. remove your air filter cover. look to the lower right side. You will see a small hole thats where the screw driver goes in to adjust your idle. Ya the dealer has a scanlizer that can also do it if u want to spend the bucks.
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