I am not questioning that the IACV was sticking, and lubricating it cured the problem. I just want to share what I observed when I replaced my IACV: The original (defective) IACV did not show any signs of sticking in the aluminum throttle body assembly. There were no signs of galling, or abrasion, and there were no signs of any dirt or anything else that could have caused the IACV to stick. I performed side-by-side tests activating and deactivating the old and new IACVs side-by-side, and they both functioned identically. My conclusion is that the defective IACV that I replaced had an internal, intermittent short that came and went randomly. I applied a very light coat of grease to the new IACV and have never experienced the problem again. I would NEVER go through all the work to remove an IACV just to lubricate it and reinstall it if there was no hard evidence that it was sticking - once you have the old one out just replace it with a new one, unless you have nothing better to do with an entire day.
CB1100 Idle speed instability problem
- Thread starter ericlo69_imp
- Start date
max
Road warrior
Just had an idea Dave, do you think it is possible that the brass center part of the piston is sintered?
Sintered bronze is porous, is used as bearings for starter motors and the pores can/should be filled with lubricant, what if some were not filled and made it off the assembly line and got used on some of the 2014 models?
Sintered bronze is porous, is used as bearings for starter motors and the pores can/should be filled with lubricant, what if some were not filled and made it off the assembly line and got used on some of the 2014 models?
Hi Max. I saved my old IACV and just looked at it; the moving piston does not appear to be sintered. It has a very smooth surface, possibly polished. It doesn't look like it is brass, and I don't think it is chrome plated; it is non-magnetic. I would guess aluminum, but I think an aluminum surface would oxidize and not maintain this shine. It sure looks like steel, maybe stainless? What's your guess? I posted a picture of it somewhere in this post a couple of years ago and the color in that picture does give the impression that it is brass, but the picture is misleading.max_imp said:
max
Road warrior
Thanks for that info Dave, i was just brainstorming to see what the germans have done to repair their bikes.
Agree with the previous member who suggested to replace rather than clean the iacv after all the work to get it out, but just curious, cheers.
Agree with the previous member who suggested to replace rather than clean the iacv after all the work to get it out, but just curious, cheers.
Enzofour_imp
Running like a top
Is it necessary to remap the ECU when replacing the IACV?
Lord Popgun
Road warrior
No. Replace it and it’s done.
Enzofour_imp
Running like a top
Eureka! IACV removed by removing only the airbox,
now I await the new IACV
now I await the new IACV
peterbaron
Road warrior
Good job, Enzo 
Seems like such harmless little thing. Good luck with install on the new one when you get it.Enzofour_imp said:Eureka! IACV removed by removing only the airbox,
now I await the new IACV
GoldOxide_imp
Road warrior
:dodgy: Harmless? Looks like it should go into some orfice somewhere.pdedse_imp said:Seems like such harmless little thing. Good luck with install on the new one when you get it.Enzofour_imp said:Eureka! IACV removed by removing only the airbox,
now I await the new IACV
Nevertheless, I hope it just works for you.
peterbaron
Road warrior
Just don't know why Honda used this prehistoric stepper motor solution....when there is much modern, flawlessly working air idle control valve design...perhaps cost or historic stock pile forced them to use it 
GoldOxide_imp
Road warrior
It could be as simple as they understand their implementation and its range of ability that is "good enough" to meet product requirements. This practice is very common among industrial product companies.
If it failed to meet their product requirements, they would seek out an alternative, and possibly more modern or simpler approach.
And yes, maybe Honda has a huge inventory of these parts. That also plays into decision making for sure PB.
If it failed to meet their product requirements, they would seek out an alternative, and possibly more modern or simpler approach.
And yes, maybe Honda has a huge inventory of these parts. That also plays into decision making for sure PB.
Enzofour_imp
Running like a top
with a lot of patience and a pinch of cunning.Dave_imp said:
Seriously, the biggest challenge was getting the airbox off the frame.
Your always ok with the new IACV?
How many km have you traveled since the replacement?
PowerDubs_imp
Road warrior
Dave_imp said:
Same way we all swap the velocity stacks? Not difficult...
Enzofour_imp
Running like a top
Dave_imp said:
I have logged almost 10,000 miles since replacing the IACV. Bike continues to run perfectly.
[/QUOTE]
I have logged almost 10,000 miles since replacing the IACV. Bike continues to run perfectly.
[/QUOTE]
wonderful news
max
Road warrior
Enzo since you have a bad iacv can you think of a reason that made it fail slowly?
And which screw was the most difficult to remove in the airbox?
And which screw was the most difficult to remove in the airbox?
Enzofour_imp
Running like a top
As I wrote in another post, I bought the bike used in November 2020.max_imp said:
Due to lockdown covid I did very few 400 km approx. Twice it turned off due to a too low minimum, the last vote was turned off by the Honda dealer who found the problem, in fact the new IACV valve is given to me under warranty.
No screws were particularly difficult, the difficulty was getting the filter box out of the frame, due to the very little space.
Enzofour_imp
Running like a top
Today the Honda dealer informed me that in 2016 Honda sent dealers an ECU update.
This update was not an official reminder, but a tip to use on 2014/2015 models with low idle and shutdown issues.
On 14/04/2021 they will install this update for me, we will see the effects.
I will try to get the name / code of the firmware for this update.
Meanwhile, with the replacement of the IACV the bike didn't give me any more problems.
This update was not an official reminder, but a tip to use on 2014/2015 models with low idle and shutdown issues.
On 14/04/2021 they will install this update for me, we will see the effects.
I will try to get the name / code of the firmware for this update.
Meanwhile, with the replacement of the IACV the bike didn't give me any more problems.
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