CB1100 Idle speed instability problem

[Retsel_imp]

Just though I'd insert my simple solution. But a standard! Works for me.

Sent from my SM-T710 using Tapatalk

[dave]

A question for those who are experiencing the High / Low RPM Idling problem: Are you guys watching your fuel mileage closely? I have kept a strict record of my mileage since day 1 (13,000 miles now), and my mileage varies erratically. I chalked it up to not carefully refilling the tank exactly the same each time because my riding style rarely varies. But, when I replaced my battery my bike ran perfectly for the next 1 1/2 tanks of fuel, and I recorded one of the higher (47.4 mpg) fuel consumption readings (and this was with higher than average around town riding). I never thought about correlating my fuel mileage to the high/low RPM problem, but just "maybe" there is a connection? I've read where some members average 50+ mpg (MR. Ferret). I have averaged 45.7 mpg since I purchased this bike, and I ride it very conservatively, with about 97% freeway riding. I've exceeded 50 mpg on a few occasions, and I've dipped as low as 37 mpg, with no discernible difference in riding style. I don't know if the idle issue has any affect on my mileage, but seeing how the idle problem comes and goes, and my mileage varies, maybe there is some connection?

[johnf514_imp]

Dave, I noticed a remarkable decrease in fuel mileage when I experienced high idle issues. I usually get ~45MPG when cruising on the open road, and maybe 40MPG around town. With the high idle condition, I was probably in the ~30MPG range.

[Riko_imp]

simple suggestion

IF you guys are still under warranty, can't you simply demand your dealer to replace the throttle body under warranty?

You'd help us all by making the issue official to Honda.
If Honda can collect a larger number of faulty parts, maybe they can find a common root cause in those faulty parts?

Because, lets face it, everything that has been tried out here or suggested here, simply does not work.

[the Ferret]

Dave these sip a bit more fuel at freeway speeds (70 mph?) and if you are running freeway 97% of the time I would expect mid 40's would be about right.

Probably 99 % of my riding is two lane country back roads at 45-60 mph

[curlyjoe_imp]

simple suggestion

IF you guys are still under warranty, can't you simply demand your dealer to replace the throttle body under warranty?

You'd help us all by making the issue official to Honda.
If Honda can collect a larger number of faulty parts, maybe they can find a common root cause in those faulty parts?

Because, lets face it, everything that has been tried out here or suggested here, simply does not work.

Riko, a tech from Honda diagnosed johnf514 high idle as a problem in the IACV. They replaced the IACV and after 3+ months he hasn't had a problem. Am I correct johnf? Riko see his post #142 in this thread.

Here is johnf514's post:

"Chiming in again for new members with my experience.

Bought a 2014 CB1100 EX with 6100 miles on it in Feb 2016, with over one year of warranty left.

Issue occurred three times over the last 10 months (high idle condition). The first two times, the dealership reset the ECU, which treated the symptom, but did not resolve the issue, and the high idle condition returned.

The third time I took the bike to the dealer, I demanded that they keep the bike until the issue was resolved before resetting the ECU. Honda sent a tech to the dealership and they determined the IACV motor was sending faulty information to the ECU, thus causing it to enter "limp mode." The dealership replaced the IACV motor (this was 3 months ago) and the issue has not returned.

I have 3 more months of warranty left, and I hope the condition does not return. Let me know if you have any questions."

[the Ferret]

FWIW I think replacement parts have their own warranty and that may be 12 months. So johnf may have 9 more months warranty on the IACV unit itself. He might want to ask his service manager or parts dept about that (That's how it used to be when I was in the business)

[johnf514_imp]

Ferret, much appreciated on that note. I'll hopefully not have to find out but will keep it in mind if any further issue come up.

simple suggestion

IF you guys are still under warranty, can't you simply demand your dealer to replace the throttle body under warranty?

You'd help us all by making the issue official to Honda.
If Honda can collect a larger number of faulty parts, maybe they can find a common root cause in those faulty parts?

Because, lets face it, everything that has been tried out here or suggested here, simply does not work.

Riko, a tech from Honda diagnosed johnf514 high idle as a problem in the IACV. They replaced the IACV and after 3+ months he hasn't had a problem. Am I correct johnf? Riko see his post #142 in this thread.

Here is johnf514's post:

"Chiming in again for new members with my experience.

Bought a 2014 CB1100 EX with 6100 miles on it in Feb 2016, with over one year of warranty left.

Issue occurred three times over the last 10 months (high idle condition). The first two times, the dealership reset the ECU, which treated the symptom, but did not resolve the issue, and the high idle condition returned.

The third time I took the bike to the dealer, I demanded that they keep the bike until the issue was resolved before resetting the ECU. Honda sent a tech to the dealership and they determined the IACV motor was sending faulty information to the ECU, thus causing it to enter "limp mode." The dealership replaced the IACV motor (this was 3 months ago) and the issue has not returned.

I have 3 more months of warranty left, and I hope the condition does not return. Let me know if you have any questions."

Joe, correct, no issues with the IACV since replacement. Put on ~1K miles since then.

As a side note, I accidentally simulated the "conditions" I thought brought about the high idle state by stalling a few times yesterday. A touch embarrassing, but for the sake of science, the bike did not return to a high idle state as it had in the past when stopping and starting the engine several times in quick succession.

[Riko_imp]

simple suggestion

IF you guys are still under warranty, can't you simply demand your dealer to replace the throttle body under warranty?

You'd help us all by making the issue official to Honda.
If Honda can collect a larger number of faulty parts, maybe they can find a common root cause in those faulty parts?

Because, lets face it, everything that has been tried out here or suggested here, simply does not work.

Riko, a tech from Honda diagnosed johnf514 high idle as a problem in the IACV. They replaced the IACV and after 3+ months he hasn't had a problem. Am I correct johnf? Riko see his post #142 in this thread.

Here is johnf514's post:

"Chiming in again for new members with my experience.

Bought a 2014 CB1100 EX with 6100 miles on it in Feb 2016, with over one year of warranty left.

Issue occurred three times over the last 10 months (high idle condition). The first two times, the dealership reset the ECU, which treated the symptom, but did not resolve the issue, and the high idle condition returned.

The third time I took the bike to the dealer, I demanded that they keep the bike until the issue was resolved before resetting the ECU. Honda sent a tech to the dealership and they determined the IACV motor was sending faulty information to the ECU, thus causing it to enter "limp mode." The dealership replaced the IACV motor (this was 3 months ago) and the issue has not returned.

I have 3 more months of warranty left, and I hope the condition does not return. Let me know if you have any questions."

Riko, a tech from Honda diagnosed johnf514 high idle as a problem in the IACV. .... I was talking about the low idling issues that lead to stalling.

To be honest, and this is a first time talking about it here....I think, but from time to time I also experience a high idle running bike.

But it doesnt bother me nearly as much as the low idle stalling issue I had, so I won't even mention it.

+ its rare and I cannot possibly say what triggers it, let alone what the solution is to fix that 'issue'

simple suggestion

IF you guys are still under warranty, can't you simply demand your dealer to replace the throttle body under warranty?

You'd help us all by making the issue official to Honda.
If Honda can collect a larger number of faulty parts, maybe they can find a common root cause in those faulty parts?

Because, lets face it, everything that has been tried out here or suggested here, simply does not work.

Riko, a tech from Honda diagnosed johnf514 high idle as a problem in the IACV. They replaced the IACV and after 3+ months he hasn't had a problem. Am I correct johnf? Riko see his post #142 in this thread.

Here is johnf514's post:

"Chiming in again for new members with my experience.

Bought a 2014 CB1100 EX with 6100 miles on it in Feb 2016, with over one year of warranty left.

Issue occurred three times over the last 10 months (high idle condition). The first two times, the dealership reset the ECU, which treated the symptom, but did not resolve the issue, and the high idle condition returned.

The third time I took the bike to the dealer, I demanded that they keep the bike until the issue was resolved before resetting the ECU. Honda sent a tech to the dealership and they determined the IACV motor was sending faulty information to the ECU, thus causing it to enter "limp mode." The dealership replaced the IACV motor (this was 3 months ago) and the issue has not returned.

I have 3 more months of warranty left, and I hope the condition does not return. Let me know if you have any questions."

Like johnf514 you speak of an EX...and you're from the US, so I assume you do not have an EX since they are not sold in the States.
It came out by his describtion he doesnt own an EX, wich makes sense...

And I have to repeat, you are sharing info regarding the high idling issues, while I'm talking all the time about low idle + stalling.

Don't mix things up that will lead to confusion.
Be carefull with posts on boards, and faulty information

I know members from asia and europe read this board because they have their specific issues, as you can read in this thread, and I want to shime in by correcting confusing information...
Nothing more confusing than wrong info.

[dave]

simple suggestion

IF you guys are still under warranty, can't you simply demand your dealer to replace the throttle body under warranty?

You'd help us all by making the issue official to Honda.
If Honda can collect a larger number of faulty parts, maybe they can find a common root cause in those faulty parts?

Because, lets face it, everything that has been tried out here or suggested here, simply does not work.

My bike has been out of warranty for over a year now, and I have not given up trying to fix this myself yet. John's problem was corrected by replacing the IACV, so that's what I will probably do next. But, first I am going to write a letter to Honda and see how they reply. I already talked to my dealer and they were clueless.