Hunting rpm

[johnf514_imp]

Hi Tory, Dave. I caution you both on the ECU reset/reflash. I had this done three (3) times and the high idle condition returned. It was only after the dealership replaced the idle air control valve motor that the issue was (hopefully) resolved.

I realize that your issue may be different from mine, just wanted to add my experience.

[tory_imp]

hi Dave,popgun
my bike CB1100ex 2014 since i found engine Hunting rpm or idling too slow to idling too fast then did
1.Installing an 02 sensor eliminator http://cb1100forum.com/forum/showthread.php?tid=6988
2.PAIR Valve Mod http://cb1100forum.com/forum/showthread.php?tid=1824

it better but can't fix it i contact with honda Thailand told them about my bike so they call me to bring my bike for upgrad ECU software only. all problem solved.(i found Power and Torque better than before too.)

service bulletin number or anything else? no don't have ,but i think honda japan know about this problem
in my country just 2 bike got Hunting rpm and solve

all problem because euro emissions if honda unlock software all the world maybe illegal for some country.
sorry about my poor english

[dave]

Hi Tory, Dave. I caution you both on the ECU reset/reflash. I had this done three (3) times and the high idle condition returned. It was only after the dealership replaced the idle air control valve motor that the issue was (hopefully) resolved.

I realize that your issue may be different from mine, just wanted to add my experience.

Thank you John. Were you able to hear your IACV cycle when you turned on the ignition before it was replaced? You have to listen carefully because the electric fuel pump cycles at the same time. I can definitely hear my IACV cycling, so I know the motor is functioning. If it's actually doing something, I don't know. What can you tell me about the ECU reset/reflash? Was this performed by Honda? Did they just reset it back to the original settings, or was a new map installed? My dealer doesn't have any information about a new map being available. Any information you can provide me that I can share with my dealer is greatly appreciated.

hi Dave,popgun
my bike CB1100ex 2014 since i found engine Hunting rpm or idling too slow to idling too fast then did
1.Installing an 02 sensor eliminator http://cb1100forum.com/forum/showthread.php?tid=6988
2.PAIR Valve Mod http://cb1100forum.com/forum/showthread.php?tid=1824

it better but can't fix it i contact with honda Thailand told them about my bike so they call me to bring my bike for upgrad ECU software only. all problem solved.(i found Power and Torque better than before too.)

service bulletin number or anything else? no don't have ,but i think honda japan know about this problem
in my country just 2 bike got Hunting rpm and solve

all problem because euro emissions if honda unlock software all the world maybe illegal for some country.
sorry about my poor english

Hi Tory, thank you for your reply, and your English is fine Only two bikes in Thailand have had this problem? I haven't had much success with my Honda dealer addressing a fuel injection problem I had with this bike on the day I bought it (I eventually fixed it myself by performing the Throttle Position Sensor re-set that another member of this forum recommended). Unless I can go into my dealer with solid evidence that a repair exists, I don't have any faith that they will do anything except present me with an expensive bill for the diagnostic test. Funny thing with my bike (and I believe another member of this forum reported the same thing) is that when I unplug the Engine Oil Temperature (EOT)sensor the bike runs perfectly. I replaced the EOT sensor with a new one and the high idling was not fixed, but when I performed a resistance test on the new sensor it was faulty (just like my original one). I am presently waiting for my dealer to get me another new EOT sensor (they performed their own test on the EOT sensor when I returned it and agreed it was not within specification).

[johnf514_imp]

Hi Dave. Not sure about the IACV motor cycling before it was replaced. The dealership replaced it a couple weeks ago after determining that it was faulty, and without any other changes, the high idle symptom disappeared.

Previously, the dealership had simply reset the ECU (no remap), and the high idle went away for a couple months. I noticed that several stop-and-starts in a row (like running multiple errands) would make the high idle symptom return. The dealership stated this was due to the IACV motor sending faulty signals to the ECU, thus putting the bike in a high idle "limp" mode.

YMMV, but I recommend asking to test the IACV motor without any sort of ECU work, and seeing if the high idle disappears. I have yet to do a stop-and-start trip, but will do so soon to see if I can trip the high idle and prove to the dealer that there is something else still wrong with the bike. I have six months of Honda Protection Plan warranty left, so I'd rather have the issue taken care of now.

[dave]

Hi Dave. Not sure about the IACV motor cycling before it was replaced. The dealership replaced it a couple weeks ago after determining that it was faulty, and without any other changes, the high idle symptom disappeared.

Previously, the dealership had simply reset the ECU (no remap), and the high idle went away for a couple months. I noticed that several stop-and-starts in a row (like running multiple errands) would make the high idle symptom return. The dealership stated this was due to the IACV motor sending faulty signals to the ECU, thus putting the bike in a high idle "limp" mode.

YMMV, but I recommend asking to test the IACV motor without any sort of ECU work, and seeing if the high idle disappears. I have yet to do a stop-and-start trip, but will do so soon to see if I can trip the high idle and prove to the dealer that there is something else still wrong with the bike. I have six months of Honda Protection Plan warranty left, so I'd rather have the issue taken care of now.

Thanks for the feedback John. My bike is out of warranty and I want to avoid paying big $ to the dealer if I can, so I am trying my best to fix this problem myself (although I am beginning to think this is highly unlikely). The fact that unplugging my EOT sensor makes the bike run perfectly really makes me think that the problem has something to do with the computer recognizing the correct operating temperature of the engine and adjusting the idle speed appropriately. My original, and the first replacement EOT sensor, both measured out of specification according to the Honda shop manual, and I am now waiting for another EOT sensor from the dealer (they took the defective sensor back after they confirmed for themselves that it was faulty). Both my original and the first replacement sensors measured lower-than-designed resistance (1.9 K-ohm and 2.0 K-ohm, spec is 2.4K-ohm to 2.9 K-ohm). I wish I understood how the IACV, the EOT sensor, and the computer all work together because I think they're all related to this high / low idle speed issue.

[johnf514_imp]

Dave, hoping in your case it is just the EOT sensor. That would be the least expensive and time consuming fix. Keep us posted.

[dave]

Dave, hoping in your case it is just the EOT sensor. That would be the least expensive and time consuming fix. Keep us posted.

I'll summarize to keep this simple:
1. New EOT sensor does not correct high idle speed problem.
2. EOT sensor resistance is very sensitive to temperature variation so be careful when testing. Honda says to inspect at 68 deg F, and they mean it. A few degrees warmer (after holding it in your hand) will cause a good sensor to test bad.
3. I got frustrated riding my bike when the idle speed was at 1,500 RPM so I stopped and unplugged the EOT sensor and it ran perfect.
4. Unplugging my EOT sensor makes my bike run perfect when warm, but hard to start after sitting for a few days.
5. In the past my bike had fixed itself when this problem occurred, but that doesn't seem to be happening now.
6. I am nearly at my wits end with this bike and I may have to resort to taking it to the dealer, but I HATE doing this (I'm not giving up yet).
7. I can hear my IACV cycling "normally" (?), so I don't think it's this. The fact that my bike runs perfectly with the EOT sensor unplugged makes me think it's not related to the IACV.
8. I am waiting to see if I can get some more feedback from members who have had their ECM remapped before going to the dealer because the dealer doesn't have a clue about what I am talking about.

[johnf514_imp]

HI Dave, sorry to hear the EOT sensor fix did not work in your case. Going to the dealer may allow them to run tests and pull codes from the ECM, helping with the troubleshooting process. While the IACV may sound like it is cycling normally, the motor could still be sending bad data to the ECM.

Talk to the dealer and perhaps they will run the codes for you at no charge. This is a documented issue with the CB1100 and they can reference my case (Central FL Powersports in Kissimmee, FL, dated Oct 24 2016, tech name Jimmy Le) for further details.

I hope this helps.

[dave]

HI Dave, sorry to hear the EOT sensor fix did not work in your case. Going to the dealer may allow them to run tests and pull codes from the ECM, helping with the troubleshooting process. While the IACV may sound like it is cycling normally, the motor could still be sending bad data to the ECM.

Talk to the dealer and perhaps they will run the codes for you at no charge. This is a documented issue with the CB1100 and they can reference my case (Central FL Powersports in Kissimmee, FL, dated Oct 24 2016, tech name Jimmy Le) for further details.

I hope this helps.

Hi John. Thank you for your support and suggestions. I'm waiting to hear back from beardy on how his remapping went before I go to my dealer. The problem I have is I don't have much faith in the Honda dealer where I bought my bike. Maybe if it's just a matter of reading the code from the ECM they can perform this simple test. I'll keep this post updated as I work through this. Thanks again.

[dave]

Hi John. How is your bike running since the IACV was replaced? Has the high RPM idle ever returned? Thank you.