Strange throttle behaviour
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Tourer
Joined: Jul 2009
Posts: 302
Likes: 1
From: London, England
Strange throttle behaviour
Hi guys, Hope you all had a good Christmas/holidays.
I've had a problem recently, it's happened twice now over the last 3 weeks.
The throttle has been acting really weird, getting a bit scary to be honest.
The first time it happened I was riding along and had to stop at some lights, as I pulled in the clutch to roll to a stop the bike stalled, I restarted it and pulled away as I released the throttle to change up to second it was like I hadn't released the throttle and the bike kept revving so I pulled over and turned the bike off. I turned it off, started it and went to pull away again this time the revs were going up and down without me moving the throttle at all. So again turned it off restarted it and all was fine, except I was now really stressed. Went home.
The second time my bike wouldn't start after sitting all day near where I work, once I got it started it did the reving up and down thing without moving my hand as i was trying to pull away.
So what do you guys reckon? Dodgy throttle position sensor?
Thanks in advance.
Oh btw '08 Street bob, Stage 1 A/C, big radius 2-1 and V&H fuelpak. I checked the screw thing under the throttle and that hadnt accidently been tightened.
Happy New Year guys, Ride safe.
I've had a problem recently, it's happened twice now over the last 3 weeks.
The throttle has been acting really weird, getting a bit scary to be honest.
The first time it happened I was riding along and had to stop at some lights, as I pulled in the clutch to roll to a stop the bike stalled, I restarted it and pulled away as I released the throttle to change up to second it was like I hadn't released the throttle and the bike kept revving so I pulled over and turned the bike off. I turned it off, started it and went to pull away again this time the revs were going up and down without me moving the throttle at all. So again turned it off restarted it and all was fine, except I was now really stressed. Went home.
The second time my bike wouldn't start after sitting all day near where I work, once I got it started it did the reving up and down thing without moving my hand as i was trying to pull away.
So what do you guys reckon? Dodgy throttle position sensor?
Thanks in advance.
Oh btw '08 Street bob, Stage 1 A/C, big radius 2-1 and V&H fuelpak. I checked the screw thing under the throttle and that hadnt accidently been tightened.
Happy New Year guys, Ride safe.
Road Master
Joined: Jan 2010
Posts: 859
Likes: 14
From: Millsboro Delaware
Not sure what it might be but I would check to see if there are any codes. It might be a bad sensor or ecm. If there are any codes then you would have a good starting point to diagnose the problem.
Seasoned HDF Member
Joined: Jul 2008
Posts: 9,281
Likes: 1,139
From: southeast PA
The red security light does not indicate you have a code. Look at this post:
https://www.hdforums.com/forum/elect...tic-codes.html
The IAC is a stepped motor in the throttle body. If you have the air filter off you can see it at about 11 o'clock. Put a clean rag behind it so you won't get crud in the intake and spray it with carb or throttle body cleaner. By switching the ignition off and on you can see the motor moving in and out. Spray it at different positions to get as much dirt as possible.
https://www.hdforums.com/forum/elect...tic-codes.html
The IAC is a stepped motor in the throttle body. If you have the air filter off you can see it at about 11 o'clock. Put a clean rag behind it so you won't get crud in the intake and spray it with carb or throttle body cleaner. By switching the ignition off and on you can see the motor moving in and out. Spray it at different positions to get as much dirt as possible.
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Seasoned HDF Member
Joined: Feb 2009
Posts: 5,542
Likes: 6,196
From: In your head rent free
Try running the bike without the Fuel Pack and see if the problem repeats.
If it doesn't, unplug and clean all the connections at the Fuel Pack/ECM.
Put some dielectric grease on the pins and connectors and reattach.
If it doesn't, unplug and clean all the connections at the Fuel Pack/ECM.
Put some dielectric grease on the pins and connectors and reattach.
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Ultimate HDF Member
Joined: May 2008
Posts: 6,642
Likes: 48
From: Ogden, UT
+1 on removing the fuelpak, this is one reason I dumped my fuelpak, for some reason cold day rides acted like a carbed bike, then it started doing intermittent crap soon as I removed it bike ran fine.
Do not put dielectric grease on the pins, it is a non-conductive material.