IAC problems?
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Intermediate
Joined: Jul 2010
Posts: 33
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From: Ohio
IAC problems?
I originally posted this as a possible speed sensor problem, but now I am not so sure. I originally stated that the turn signals would not cancel in addition to stalling but have not seen that more than a couple times and I have not seen any problems with the speedo. I have been reading about symptoms of a bad IAC and sounds more like my problem now. I have a 03 electra glide injected bike. After riding for 30 or more minutes when I come to a stop the bike will stall sometimes or really low idle then return to normal. I can keep it running if I give a little throttle when stopped. I know when it is going to act up cause the bike will get bad decel popping when I let off the throttle and coast. I am thinking the IAC is loosing its step count while riding for a bit and that's why it only acts up after riding for a while. When it dies at a stop I can always fire it back up and it will idle fine. I want so opinions on this please before I bit the bullet and buy a new IAC. Oh and also No codes have been thrown or stored. Thanks
Seasoned HDF Member
Joined: Mar 2007
Posts: 66,948
Likes: 4,573
From: TOAK western branch
I originally posted this as a possible speed sensor problem, but now I am not so sure. I originally stated that the turn signals would not cancel in addition to stalling but have not seen that more than a couple times and I have not seen any problems with the speedo. I have been reading about symptoms of a bad IAC and sounds more like my problem now. I have a 03 electra glide injected bike. After riding for 30 or more minutes when I come to a stop the bike will stall sometimes or really low idle then return to normal. I can keep it running if I give a little throttle when stopped. I know when it is going to act up cause the bike will get bad decel popping when I let off the throttle and coast. I am thinking the IAC is loosing its step count while riding for a bit and that's why it only acts up after riding for a while. When it dies at a stop I can always fire it back up and it will idle fine. I want so opinions on this please before I bit the bullet and buy a new IAC. Oh and also No codes have been thrown or stored. Thanks
Last edited by soft 02; Apr 27, 2012 at 09:15 PM.
Thread Starter
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Intermediate
Joined: Jul 2010
Posts: 33
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From: Ohio
Been down this road a few times. Have you tried to clean the IAC. For me its been the TPS. Symptoms were cold high idle and would die at stops after high throttle like getting off of the freeway. Lots of good info in this thread:https://www.hdforums.com/forum/touri...le-issues.html
Seasoned HDF Member
Joined: Mar 2007
Posts: 66,948
Likes: 4,573
From: TOAK western branch
The TPS is like 28 bucks and two screws. If it were me id change it. Not hard and pretty cheep. Mine never threw a code. Had water in the sensor from riding in the rain with exposed air cleaner.
Listed under electrical-ignition modual-fuel injected item # 12http://partsfinder.onlinemicrofiche....RS-W/-SWITCHES
Listed under electrical-ignition modual-fuel injected item # 12http://partsfinder.onlinemicrofiche....RS-W/-SWITCHES
Last edited by soft 02; Apr 27, 2012 at 09:34 PM.
Thread Starter
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Intermediate
Joined: Jul 2010
Posts: 33
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From: Ohio
A Harley part that's 30 bucks! I want to get it just to say I bought a genuine MoCo part for under $100. Seriously though I might pick one up tomorrow. Thanks for the advice. I will update if I replace AND find time to ride it this weekend (I also have an 8 month old baby to spend time with)
Seasoned HDF Member
Joined: Mar 2007
Posts: 66,948
Likes: 4,573
From: TOAK western branch
A Harley part that's 30 bucks! I want to get it just to say I bought a genuine MoCo part for under $100. Seriously though I might pick one up tomorrow. Thanks for the advice. I will update if I replace AND find time to ride it this weekend (I also have an 8 month old baby to spend time with)
Thread Starter
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Intermediate
Joined: Jul 2010
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From: Ohio
Trending Topics
Stage I
Joined: Jun 2013
Posts: 1
Likes: 0
From: Perth, Western Australia
For what it's worth, even though I'm an Aussie, I own a 2012 XL1200C, and within 4 months of buying it and literally riding it off the showroom floor, my bike started 'surging' and misfiring, at any speed and/or rpm below 110km/h (~70m/h)...Took it to several dealers who didn't know wtf was goin on, after havin several months with the bike, total (each dealer and service dept I gave 2 wks).
Finally, in an act of desperation, I took it to the last HD-related service place. Took them literally 30 mins to find and fix the problem...Apparently, the way certain EVO engines are built, the softails "tend to" have faulty Idle Air Controllers, and if you go over any kind of flaw in the road that is of a 'decent' severity, the IAC can become 'jammed' open, and the bike ends up taking in what amounts to 100% air, AS WELL AS the tuned fuel amount, resulting in what is essentially misfiring, until the bike is 'asked' to start consuming s**tloads of fuel i.e. a 2/3->3/3 open throttle.
Bottom line, SPECIFICALLY ASK to get the IAC checked, REGARDLESS of the model...My old man owns a 2010 Rocker 'C' that has no problem, but he also bought a Breakout (NON-CVO) that also had the same problem, after installing stage-1.
It seems that, as long as the bike is stock, the IAC is ok, but ANY exhaust/airflow modification, causes the IAC to lose it completely.
MAKE SURE TO GET YOUR IAC CHECKED, AFTER YOU INSTALL A COMPLETE STAGE-1 MOD!!!!!!!!!!
Finally, in an act of desperation, I took it to the last HD-related service place. Took them literally 30 mins to find and fix the problem...Apparently, the way certain EVO engines are built, the softails "tend to" have faulty Idle Air Controllers, and if you go over any kind of flaw in the road that is of a 'decent' severity, the IAC can become 'jammed' open, and the bike ends up taking in what amounts to 100% air, AS WELL AS the tuned fuel amount, resulting in what is essentially misfiring, until the bike is 'asked' to start consuming s**tloads of fuel i.e. a 2/3->3/3 open throttle.
Bottom line, SPECIFICALLY ASK to get the IAC checked, REGARDLESS of the model...My old man owns a 2010 Rocker 'C' that has no problem, but he also bought a Breakout (NON-CVO) that also had the same problem, after installing stage-1.
It seems that, as long as the bike is stock, the IAC is ok, but ANY exhaust/airflow modification, causes the IAC to lose it completely.
MAKE SURE TO GET YOUR IAC CHECKED, AFTER YOU INSTALL A COMPLETE STAGE-1 MOD!!!!!!!!!!
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Road Captain
Joined: Oct 2017
Posts: 546
Likes: 54
From: Toronto
For what it's worth, even though I'm an Aussie, I own a 2012 XL1200C, and within 4 months of buying it and literally riding it off the showroom floor, my bike started 'surging' and misfiring, at any speed and/or rpm below 110km/h (~70m/h)...Took it to several dealers who didn't know wtf was goin on, after havin several months with the bike, total (each dealer and service dept I gave 2 wks).
Finally, in an act of desperation, I took it to the last HD-related service place. Took them literally 30 mins to find and fix the problem...Apparently, the way certain EVO engines are built, the softails "tend to" have faulty Idle Air Controllers, and if you go over any kind of flaw in the road that is of a 'decent' severity, the IAC can become 'jammed' open, and the bike ends up taking in what amounts to 100% air, AS WELL AS the tuned fuel amount, resulting in what is essentially misfiring, until the bike is 'asked' to start consuming s**tloads of fuel i.e. a 2/3->3/3 open throttle.
Bottom line, SPECIFICALLY ASK to get the IAC checked, REGARDLESS of the model...My old man owns a 2010 Rocker 'C' that has no problem, but he also bought a Breakout (NON-CVO) that also had the same problem, after installing stage-1.
It seems that, as long as the bike is stock, the IAC is ok, but ANY exhaust/airflow modification, causes the IAC to lose it completely.
MAKE SURE TO GET YOUR IAC CHECKED, AFTER YOU INSTALL A COMPLETE STAGE-1 MOD!!!!!!!!!!
Finally, in an act of desperation, I took it to the last HD-related service place. Took them literally 30 mins to find and fix the problem...Apparently, the way certain EVO engines are built, the softails "tend to" have faulty Idle Air Controllers, and if you go over any kind of flaw in the road that is of a 'decent' severity, the IAC can become 'jammed' open, and the bike ends up taking in what amounts to 100% air, AS WELL AS the tuned fuel amount, resulting in what is essentially misfiring, until the bike is 'asked' to start consuming s**tloads of fuel i.e. a 2/3->3/3 open throttle.
Bottom line, SPECIFICALLY ASK to get the IAC checked, REGARDLESS of the model...My old man owns a 2010 Rocker 'C' that has no problem, but he also bought a Breakout (NON-CVO) that also had the same problem, after installing stage-1.
It seems that, as long as the bike is stock, the IAC is ok, but ANY exhaust/airflow modification, causes the IAC to lose it completely.
MAKE SURE TO GET YOUR IAC CHECKED, AFTER YOU INSTALL A COMPLETE STAGE-1 MOD!!!!!!!!!!