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[bdas2]

We have a 09 road glide that sometimes (not always) starts at normal idle and immediately races to 3000 rpm and stays. I have turn the ignition on and off several times to clear this.  I have taken it to the dealer and they say they cannot fix the problem. I have been told by friends it could be three different things.
1. need new throttle body

2. maybe Idle Air Control problem(IAC)

3. throttle potentiometer problem

I am asking help from here because I am getting nowhere with Harley

[Twolanerider]

Might not be your problem; but then again it might.  And the solution is cheap (ok, free) and easy to try.

Your description sounds much like what happened to many early on in the fly by wire experiment by Harley.  It'll behave this way if you're not very careful about shutting off the bike with throttle all the way at 0% of activation.  In other words at a complete idle.

If you've got any throttle percentage engaged when you turn the bike off the bike will take that as the new zero point the next time it runs.  So the idle is higher.  Sometimes a lot higher. 

A sequence of four on and offs with the switch (I think that's the right number) will clear this; until it happens again the next time.  So clear it for now then be very careful that your hand is off the throttle when you shut the bike off. 

[bdas2]

Thanks for your reply  I will try watching that and see if that's the solution  I'll post back with results

[FlaHeatWave]

My '09 SERG ( 'bought 6/12 w/2,420 mi.) does this once in a while, probably <2% of the time.

It acts like it's stuck on a fast idle cam of a Holly or Rochester automotive carb.

It doesn't seem to matter what the ambient temp is.

I never use the run switch on the handlebar, just turn the key switch off with my right hand, so that precludes holding the throttle open during shutdown. That's the way I've always done it on all my bikes (TBW or not) just because I'm right handed.

Come to think of it, the last time the '09 did it, was when the guy at the service dept. brought the bike around for me to pick it up, they always use the run switch on the handlebar...

[Steve Cole]

The run switch issue was a 2008 - 2009 DBW issue and was resolved with later calibrations. The trick is to shut the bike off with the key and your right hand like FlaHeatWave is doing. The way it works is HD believed that the position of the Twist Grip when the bike was shutdown would be stored and averaged with the last four shutdowns. This way, as the Twist Grip aged the system would cover it. The problem was/is that too many people keep there hand on the handlebar and the grip has a slight twist in it so it runs the average up and there goes the idle speed with it. So by cycling the key four times with your hands off the bar you move the average back down again. You need to make sure when cycling the key you wait 15 second OFF before turning it back on. This was solve in the 2010 and later years by a calibration change that did not take the reading of the sensor until 9 - 10 seconds after you switched it off and by then most people have there hands off the TwistGripSensor.