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I reported that my high/low idle problem was cured by a WFO run about 2 months and 2,500 miles ago. Well, it's back. It ran good as new for about 2,500 miles, and then began hinting of the fast idle last week when it took longer than normal to return to the "normal" 1050 RPM idle during a ride around town. Took the wife for a ride downtown to view all the "interesting" folks visiting our town for the Comic con event Saturday evening and as expected, we got stuck in the traffic. I knew this would be a good excuse to "stress test" my bike anyway. Despite the warmer-than-normal temperature, the slow speeds (when we were moving), and the extended waits at the red lights, my idle was perfect, for the first 20 minutes (probably 15 minutes of not moving at all). After not moving for almost 5 minutes at one stop I turned the engine off. When I turned it back on it was idling at 1,500 RPM. I continued to turn the engine off at the red lights for the next 10 minutes or so, but it was idling at 1,500, and even went as high as 1,700 at one point (it has never done this before). We then drove at an easy 65 mph on the freeway for about 6 - 8 miles, hoping that cooling the engine off would do something, but it didn't. We then stopped for an ice cream, so the bike sat for about 30 minutes. When I restarted it the idle returned to 1,050 RPM, and remained this way for the ride home, with about 3 or 4 stop lights. Riding the bike the next day the idle speed was 1,050 RPM. I will ride it tonight and see what happens.
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Dave, that behavior sounds very similar to how my high idle condition came about. Turning off the engine after being idled in traffic at a light, I fired it back up and had 1500 RPM idle. Occasionally it would return to 1050 RPM idle, but it would default to 1500 after a few rides.
Let us know how it all goes. You may have to for another WFO. What a shame. 
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So I took the bike when I went to dinner last night. About 5 miles of freeway, and three red lights (each way). The engine had plenty of time to reach operating temperature, but the idle was a perfect 1,050 RPM. This problem sure has me challenged! I'm thinking that maybe something in the way the IACV works is causing it to stick, and not function properly. Does anyone out there understand what controls the input to the IACV, and maybe how it functions? I am convinced that the engine operating temperature has something to do with it because when I unplug the Engine Oil Temperature (EOT) sensor when the idle goes to 1,500 RPM the engine returns to 1,050 RPM. Maybe the EOT sensor is sending a wrong signal to the ECU telling it that the engine is cold and therefore adjust the IACV to increase the idle speed? But I replaced the EOT sensor and this did not fix the problem. I'd replace the IACV, but another member reported that he did this and it did not correct the problem. I'm going to take it out to the desert and make another WFO run to see if this works again, as soon as I get a chance.
(07-17-2017, 04:22 AM)johnf514_imp Wrote: I wonder if there is some sort of planned obsolescence issue going on. As if something in the IACV is not designed to go beyond X miles.
My bike started this behavior around 7K mileage. Anyone else?
I think my problem started around 8k miles also.
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On our recent Colorado trip, there was an accident that had the freeway shut down, so we exited looking for an alternate route as did thousands of others. The result was a log jam. Round abouts in the city we exited in were just locked up, and even though we could maneuver faster than cars, and could switch lanes faster to try and keep moving,we were in stop and go traffic that was mostly stopped for about and hour and two miles. All 3 2014 CB's (2 dlx 1 std) were getting seriously hot so we turned them off, and restarted them often, before we finally broke thru traffic. No idle issues on any of them. I think both LR and Offroad have about 6 or 7,000 miles on theirs and I have over 34,000 on mine. So I am not sure it's stop and go traffic and a few lights causing this, but it does seem to be a common denominator in most of the issues we are reading about. Baffling and maddening.
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(07-25-2017, 10:03 PM)The ferret_imp Wrote: On our recent Colorado trip, there was an accident that had the freeway shut down, so we exited looking for an alternate route as did thousands of others. The result was a log jam. Round abouts in the city we exited in were just locked up, and even though we could maneuver faster than cars, and could switch lanes faster to try and keep moving,we were in stop and go traffic that was mostly stopped for about and hour and two miles. All 3 2014 CB's (2 dlx 1 std) were getting seriously hot so we turned them off, and restarted them often, before we finally broke thru traffic. No idle issues on any of them. I think both LR and Offroad have about 6 or 7,000 miles on theirs and I have over 34,000 on mine. So I am not sure it's stop and go traffic and a few lights causing this, but it does seem to be a common denominator in most of the issues we are reading about. Baffling and maddening.
The often restarts may be the reason for your CB and the ones of your buddies, that they don't fell into this strange idle thing. Only a presumption, because we are still in the land of theories and confusion, when it comes to the curation of it. But maybe your Hondas will never fall into it, no matter where they drive and how they been ridden.
My CB is/ was a candidate for it, I can't say it for sure which time form is the case now. Since a few weeks it idles well again after longer periods on the higher side.
But I have in mind that the trouble can start again, in a way comes and goes like the Honda finds it appropriate.
Me and my bike live with it as long as no other malefunction adds to this one, which hinders it from keep on running.
Wisedrum
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Dave, For some time I've been wondering for some time if maybe the IACV needle is maybe hanging up. Maybe in its seat. Maybe that's why Rico's bike was fixed when they changed the whole throttle body.
But, I'm not taking my bike apart to investigate this unless I have the problem.
The IACV is driven by the ECU. I can imagine any of the inputs to the ECU could/would affect the idle. I wish we had more info or at least a common cause.
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I've never seen the problem on my '13 CB (19K miles) but I never go into the city and rarely get in stop and go traffic. Since I'm retired, I have the luxury in choosing where and when to ride.
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(07-25-2017, 10:03 PM)The ferret_imp Wrote: On our recent Colorado trip, there was an accident that had the freeway shut down, so we exited looking for an alternate route as did thousands of others. The result was a log jam. Round abouts in the city we exited in were just locked up, and even though we could maneuver faster than cars, and could switch lanes faster to try and keep moving,we were in stop and go traffic that was mostly stopped for about and hour and two miles. All 3 2014 CB's (2 dlx 1 std) were getting seriously hot so we turned them off, and restarted them often, before we finally broke thru traffic. No idle issues on any of them. I think both LR and Offroad have about 6 or 7,000 miles on theirs and I have over 34,000 on mine. So I am not sure it's stop and go traffic and a few lights causing this, but it does seem to be a common denominator in most of the issues we are reading about. Baffling and maddening.
'tis baffling...mine was just the opposite...no traffic, no stops, just 1 hour of 40-60mph country riding. Then turned off for gas, started it and 1500rpm and wouldn't budge from there till bike cooled.
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pdedse, are you saying the high idle condition went away after the bike cooled down and was restarted?
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(07-27-2017, 12:10 AM)johnf514_imp Wrote: pdedse, are you saying the high idle condition went away after the bike cooled down and was restarted?
Yes, about an hour later I started the bike and it held steady at 1000 or maybe it was 1050rpm, but I didn't ride it more. That was about 10,11 days ago but then I left for vacation and I still have another week before I return home.
I'll get it out again a week from this Saturday to see what it does.
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