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+--- Thread: Really high idle (/showthread.php?tid=4483)
RE: Really high idle - pdedse - 10-14-2021
(10-14-2021, 04:30 PM)jwst11_imp Wrote: Hi,
I am from Singapore and my 2014 CB1100 EX used to have low idling problem. I have replaced the IACV using 16430-MFJ-D01 but my low idling problem came back a few weeks later. I replaced my IACV again, this time using 2017 part number 16431-MGZ-D01 and I have not encountered any low idling problem for more than a year now. Anyone know why Honda changed IACV part number from 2017 onwards when the throttle body part number remained the same for all CB1100 models?
Perhaps somone more knowledgeable than I can say for sure, but I can only assume Honda changed the IACV part number because they realized the pre-'17 IACV part was susceptible to high/low idle issues, and they "tweaked" the IACV, resulting in a new part number.
Your story is good anecdotal evidence of this; you tried the fix with the 430-MFJ--it didn't work, then you installed the '17 431-MGZ and that fixed the issue. Several others (2 or 3?) on this forum have had success by replacing the IACV. It would be helpful if they could confirm that the new IACV part was used to make the high/low idle issues go away.
Dave in San Diego?
RE: Really high idle - Cormanus - 10-14-2021
Interesting as the part number for the 2014 is still showing as 16430-MFJ-D01 which suggests Honda has not updated it.
RE: Really high idle - dave - 10-15-2021
Hi jwst11. Did you replace the IACVs yourself? If you did, how did you get the center section of the airbox out of the frame? Did you remove the rear fender? Would you happen to have any pictures you took during the process that you can share? Thank you.
RE: Really high idle - Gordo_imp - 10-15-2021
(10-14-2021, 04:30 PM)jwst11_imp Wrote: Hi,Did you do the work yourself or your local Honda dealership. Mine is at a standstill. I still cant figure out how to remove the forward airbox attached to the throttle body. Once the 7 screws are removed there is just no room to slide the rear half out between the frame, and the other half attached to the throttle body. It's also interesting to note that they changed the part number. Something a local shop had asked me when I was in picking their brains on any ideas how they would go about doing removing that forward section, if Honda changed or updated that part # They haven't worked on a CB1100, nor would they take mine on as of right now,because it's in pieces. I'll be back at it tomorrow or Sunday.
I am from Singapore and my 2014 CB1100 EX used to have low idling problem. I have replaced the IACV using 16430-MFJ-D01 but my low idling problem came back a few weeks later. I replaced my IACV again, this time using 2017 part number 16431-MGZ-D01 and I have not encountered any low idling problem for more than a year now. Anyone know why Honda changed IACV part number from 2017 onwards when the throttle body part number remained the same for all CB1100 models?
![[Image: 65bd620280bb6b92ed1241dde4c77ff5.jpg]](https://cb1100forum.net/forum/uploads/imp/202110/65bd620280bb6b92ed1241dde4c77ff5.jpg)
![[Image: 0c3f5f62c3aa14a508255eac54aae5c3.jpg]](https://cb1100forum.net/forum/uploads/imp/202110/0c3f5f62c3aa14a508255eac54aae5c3.jpg)
Titus 2:13
2013 HONDA CB1100
(10-14-2021, 09:36 PM)Cormanus_imp Wrote: Interesting as the part number for the 2014 is still showing as 16430-MFJ-D01 which suggests Honda has not updated it.I wish I would have known about an updated part#. I'm hoping I have the same luck as other users and this cures it.
Titus 2:13
2013 HONDA CB1100
RE: Really high idle - Lord Popgun - 10-15-2021
Gordo,
Looking at Enzo’s pics here: http://cb1100forum.com/forum/showthread.php?tid=8120&pid=291066#pid291066 look pretty much like your pics to me. If you look at Enzo’s pics do you see anything he did that you didn’t? I mean, he got it out. So how?
Really high idle - PowerDubs_imp - 10-15-2021
There is a ridge / tab across the top of the box for the hose that plugs into the very top front of the box.
It’s a tight fit / pry / wedge to get the back out- but just go for it- it will come out.
Sent from my iPhone using Tapatalk
RE: Really high idle - Gordo_imp - 10-15-2021
(10-15-2021, 10:28 AM)Lord Popgun_imp Wrote: Gordo,I honestly dont see anything different. There is a loom of wires and I believe a brake line that runs down the left side of the frame. Maybe disconnecting and removing the loom will help
Looking at Enzo’s pics here: http://cb1100forum.com/forum/showthread.php?tid=8120&pid=291066#pid291066 look pretty much like your pics to me. If you look at Enzo’s pics do you see anything he did that you didn’t? I mean, he got it out. So how?
Titus 2:13
2013 HONDA CB1100
(10-15-2021, 12:02 PM)PowerDubs_imp Wrote: There is a ridge / tab across the top of the box for the hose that plugs into the very top front of the box.Forgive my ignorance but are you referring to the box that holds the air filter? I removed the hose on that one and move that rearward with the battery and battery box removed.
It’s a tight fit / pry / wedge to get the back out- but just go for it- it will come out.
Sent from my iPhone using Tapatalk
There is a ridge and tab on the forward box possibly helping connect and seal. I'm afraid if I get too aggressive they might break
Titus 2:13
2013 HONDA CB1100
RE: Really high idle - dave - 10-16-2021
Your story is good anecdotal evidence of this; you tried the fix with the 430-MFJ--it didn't work, then you installed the '17 431-MGZ and that fixed the issue. Several others (2 or 3?) on this forum have had success by replacing the IACV. It would be helpful if they could confirm that the new IACV part was used to make the high/low idle issues go away.
Dave in San Diego?
[/quote]
The part number of the new / replacement IACV that I used is: 16430-MFJ-D01. It's been 11,000 miles since it was replaced and I have experienced zero idle problems.
RE: Really high idle - jwst11_imp - 10-16-2021
(10-15-2021, 02:15 AM)Dave_imp Wrote: Hi jwst11. Did you replace the IACVs yourself? If you did, how did you get the center section of the airbox out of the frame? Did you remove the rear fender? Would you happen to have any pictures you took during the process that you can share? Thank you.
Hi Dave, I replaced the IACV myself more than a year ago. I removed the rear fender and also the rear shock absorber upper mounting bolts to lower the rear wheel to remove the rear air box. After removing the 7 screws, I managed to pull out the air box center section from the side. I didn't manage to take any photos. It's not easy to remove and also to fit back air box center section because of the very tight space.
RE: Really high idle - dave - 10-18-2021
Hi Dave, I replaced the IACV myself more than a year ago. I removed the rear fender and also the rear shock absorber upper mounting bolts to lower the rear wheel to remove the rear air box. After removing the 7 screws, I managed to pull out the air box center section from the side. I didn't manage to take any photos. It's not easy to remove and also to fit back air box center section because of the very tight space.
[/quote]
Hi jwst11. It sounds like you removed your airbox like I did, except I removed the entire rear wheel and the RH side shock absorber to improve access - access to remove the screws and access to remove the airbox from the frame. It sounds like you followed the steps outlined in the factory service manual to the letter. Some members have removed the airbox without removing the rear fender, or all of the other parts occupying the space aft of the airbox assembly; I don't know how they did this. I assume it required some force to squeeze the center portion of the airbox out. When I try to work like this I always end up breaking something, and costing me more time and money in the long run.