10-14-2021, 09:21 PM
(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?