peterbaron
Road warrior
CB1100 Idle speed instability problem
- Thread starter ericlo69_imp
- Start date
GoldOxide_imp
Road warrior
Glad you have found comfort and be on the road again.iamheero_imp said:
Congratulations IaH!
Houtman_imp
Road warrior
Thank you for letting us know this , not cheap but doable .
the Ferret
Road warrior
good deal IAH!
Good to see you back iamheero. I hope that’s fixed it. On the basis of what others have said about what’s involved, that price seems reasonable. And worth it to have your bike back in good running order.
max
Road warrior
Nice job iamheero, good to hear the positive outcome, not many are affected and we have not had any second instances of this problem so it is definitely the fix.
So you should be fine for the next 200.000 km. well done and of course we appreciate the update very much and we were all too pleased to be of assistance to you, cheers.
So you should be fine for the next 200.000 km. well done and of course we appreciate the update very much and we were all too pleased to be of assistance to you, cheers.
iamheero_imp
Running like a top
I think you're right Max, I suspect this is the last time I'll be dealing with this issue! And with all the work I did on the bike PRIOR to replacing the IACV it's like a brand new bike. New spark plugs, new battery, clean air filter, new brake and clutch fluid, brake pads, new oil, new tires... It'll be with me for a long time, that's for sure.
Very happy for you! When my '14 standard was having this issue, the IACV was a suspected cause, but not the only one. When I went to my dealership to talk about the problem (which was very intermittent at the time) the service manager warned me that it wouldn't surprise him if they needed multiple hour$ to diagnose the problem if the bike failed to "act up" right away, and that the charge would not be limited to an hour of their time or a set fee to diagnose. So I didn't have them look at it. If I knew I could get it repaired for less than $500, I would have gone that route.iamheero_imp said:
Lord Popgun
Road warrior
Thought I posted here yesterday. Must have forgotten to post the reply.
Anway, glad it's good now IAH. And thanks for the follow up.
Anway, glad it's good now IAH. And thanks for the follow up.
Enzofour_imp
Running like a top
Yesterday after 1 hour on the road it turned off, it no longer held the minimum.
She turned off and on again, by turning the key, and left again normally.
After another hour of travel it is off, I repeat the procedure of turning it off and on with the key and it takes me home without any problem, 20 minutes of road practically in first and second gear due to traffic.
When I get home, I leave it on for a while and accelerate, nothing happens, at least very regular.
Who can tell me if the new IACV cod. Can 16431-MGZ-D01 fitted on 2017 and later models be used on pre 2017 models? Honda cod. 16430-MFJ-D01
She turned off and on again, by turning the key, and left again normally.
After another hour of travel it is off, I repeat the procedure of turning it off and on with the key and it takes me home without any problem, 20 minutes of road practically in first and second gear due to traffic.
When I get home, I leave it on for a while and accelerate, nothing happens, at least very regular.
Who can tell me if the new IACV cod. Can 16431-MGZ-D01 fitted on 2017 and later models be used on pre 2017 models? Honda cod. 16430-MFJ-D01
Enzofour_imp
Running like a top
Note: the temperature was only 22°Enzofour_imp said:
max
Road warrior
Whilst i was reading the german forum's post on the 256000 km cb1100 i came across this description, i will post the german and translated version and put it out here for your perusal, the owner had an issue with the iacv and repaired it by cleaning the worm shaft on the iacv, he claims it has not re-occurred since;
ich war damals bei meinem Hondahändler. Anfang haben die mir nicht geglaubt, da der Fahler nicht stabil reproduzierbar war und in sehr unterschiedlichen Situationen auftrat. Ich habe meine CB dann dem Meister für zwei Tage überlassen und er ist damit dann seinen Arbeitsweg gefahren – und hat dieselben Probleme wie ich. Der anfängliche Verdacht auf defekte Benzinpumpe konnte durch einen provisorischen Austausch auf Garantie ausgeschlossen werden.
Die Ursache war die verschmutze Schnecke beim Leerlaufsteller und deshalb wurde die Leerlaufsteuerung nicht friktionsfrei umsetzt. Nach der Reinigung waren die Probleme bei meiner CB weg und sind auch nie wieder aufgetreten.
Ich weiß aber auch von einem anderen CB-Fahrer, dass ein Software-Update 2017 sein Leerlaufproblem gelöst hat.
Viele Grüße
Thorsten
I was at my Honda dealer at the time. At the beginning they didn't believe me, because the error was not stable and reproducible and occurred in very different situations. I then left my CB to the foreman for two days and he went to work with it - and has the same problems as me. The initial suspicion of a defective fuel pump could be ruled out by a provisional exchange on guarantee.
The cause was the dirty worm on the idle actuator and therefore the idle control was not implemented without friction. After cleaning, the problems with my CB were gone and never came back.
The writer also claims that a 2017 cb was repaired with a software update, just like wisedrum's one.
And a link to the page in question, it is quite a way down and of course in german;
100.000 km mit der Honda CB 1100 EX - Motorräder und Touren
( Link opens in a new tab )
Just wondering if the same can be done by removing one of the rubber hoses on the top of the iacv housing and squirting some brake cleaner into the alu pipe whilst operating the red engine stop switch to motivate the iacv back and forth.
Just for your information.
ich war damals bei meinem Hondahändler. Anfang haben die mir nicht geglaubt, da der Fahler nicht stabil reproduzierbar war und in sehr unterschiedlichen Situationen auftrat. Ich habe meine CB dann dem Meister für zwei Tage überlassen und er ist damit dann seinen Arbeitsweg gefahren – und hat dieselben Probleme wie ich. Der anfängliche Verdacht auf defekte Benzinpumpe konnte durch einen provisorischen Austausch auf Garantie ausgeschlossen werden.
Die Ursache war die verschmutze Schnecke beim Leerlaufsteller und deshalb wurde die Leerlaufsteuerung nicht friktionsfrei umsetzt. Nach der Reinigung waren die Probleme bei meiner CB weg und sind auch nie wieder aufgetreten.
Ich weiß aber auch von einem anderen CB-Fahrer, dass ein Software-Update 2017 sein Leerlaufproblem gelöst hat.
Viele Grüße
Thorsten
I was at my Honda dealer at the time. At the beginning they didn't believe me, because the error was not stable and reproducible and occurred in very different situations. I then left my CB to the foreman for two days and he went to work with it - and has the same problems as me. The initial suspicion of a defective fuel pump could be ruled out by a provisional exchange on guarantee.
The cause was the dirty worm on the idle actuator and therefore the idle control was not implemented without friction. After cleaning, the problems with my CB were gone and never came back.
The writer also claims that a 2017 cb was repaired with a software update, just like wisedrum's one.
And a link to the page in question, it is quite a way down and of course in german;
100.000 km mit der Honda CB 1100 EX - Motorräder und Touren
( Link opens in a new tab )
Just wondering if the same can be done by removing one of the rubber hoses on the top of the iacv housing and squirting some brake cleaner into the alu pipe whilst operating the red engine stop switch to motivate the iacv back and forth.
Just for your information.
the Ferret
Road warrior
Interesting. Is this worm gear is the stream of gas, in other words, would a dash of Seafoam now and then help to keep it clean and lubricated?
I have a 2013 and fortunately have had no idle issues with mine. I have read every post and have followed this thread with great interest. I am not a mechanic or technician. This is just a thought. Could the IACV be converted cheaply to a manual operation? Like a choke in the old days.
max
Road warrior
Hi Ferret and sorry for the expanded picture everyone,
I read your reply as; " in the stream of gas " in other words fuel/air mixture, ie selfcleaning.
Ahhm no, the iacv regulates the bypass air ( bypasses the butterfly valves in the picture ) in a measured amount depending on engine temperature.
The filtered air is let in at two openings just below the iacv in the throttle body and leaves the iacv by means of the two hoses on top ( left hand side )
and two air passages inside the throttle body ( right hand side ) after it has been regulated by the iacv piston on it's stainless worm shaft.
It gets passed ( sucked ) forward of the butterfly valves by the "vacuum" created by the engine in each cylinder in turn where
the injectors "mist" the fuel in the intake at which point it cleans all parts ( valves ) and the cylinder wall if it is not ignited by the sparkplug
.
Here is a short clip removing the iacv, not possible in our case with the engine in place,
showing the air passages;
In carburettor days this idle speed was achieved by slightly opening the carburettor slide and
dribbling some fuel through the small "idle jet" and the "idle air/fuel mixture screw" keeping the engine running at idle.
The previous post is just an idea that could be tried with the engine not running instead of replacing the iacv,
maybe it works maybe it doesn't.
And in reply to DSD; i have driven with the iacv disconnected but it is not reliable in the long run
and i think the air/fuel mixture may not be optimal for the purpose, however
i think iamhero has used this idea temporarily with some success before he replaced his iacv and cured the issue permanently.
I read your reply as; " in the stream of gas " in other words fuel/air mixture, ie selfcleaning.
Ahhm no, the iacv regulates the bypass air ( bypasses the butterfly valves in the picture ) in a measured amount depending on engine temperature.
The filtered air is let in at two openings just below the iacv in the throttle body and leaves the iacv by means of the two hoses on top ( left hand side )
and two air passages inside the throttle body ( right hand side ) after it has been regulated by the iacv piston on it's stainless worm shaft.
It gets passed ( sucked ) forward of the butterfly valves by the "vacuum" created by the engine in each cylinder in turn where
the injectors "mist" the fuel in the intake at which point it cleans all parts ( valves ) and the cylinder wall if it is not ignited by the sparkplug
.Here is a short clip removing the iacv, not possible in our case with the engine in place,
showing the air passages;
In carburettor days this idle speed was achieved by slightly opening the carburettor slide and
dribbling some fuel through the small "idle jet" and the "idle air/fuel mixture screw" keeping the engine running at idle.
The previous post is just an idea that could be tried with the engine not running instead of replacing the iacv,
maybe it works maybe it doesn't.
And in reply to DSD; i have driven with the iacv disconnected but it is not reliable in the long run
and i think the air/fuel mixture may not be optimal for the purpose, however
i think iamhero has used this idea temporarily with some success before he replaced his iacv and cured the issue permanently.
the Ferret
Road warrior
So in other words it only deals with air and not with fuel
max
Road warrior
correct.
Lord Popgun
Road warrior
Interesting info Max. The brake cleaner spray idea would sure be something to try before changing out an IACV.
SportsterDoc
Road warrior
Binding has long been a concern but the suspicion was of the piston binding rather than the screwdrive. Lubrication may have mitigated either binding.
CB1100 Idle speed instability problem
CB1100 Idle speed instability problem
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