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CB1100 Idle speed instability problem
Have been quiet since there was a good set of advice available from different members and too many cooks spoil the broth.
But Cormanus asked for our opinion so here it is;

Popgun and all have been trying to get to the best solution we can come up with, none of us have this issue so we had to rely on others reporting and finding a way to solve this issue, the first fix from the dealer was to replace the entire throttle body, we then thought that just replacing the iacv was a better solution and it worked for several members, international members had their ecu updated by the dealer and permanently fixed the problem but the us has not made this option available.

Recently the ecu replacement has had the desired effect, the fact that the majority of faults have been in the 2014 models points straight to the ecu.

But another point started to take shape in my opinion; one thing that also happens when replacing the iacv is that the battery is disconnected for some time which made me wonder;
Is it possible that the ecu has reset itself to an original state as if it has left the factory by disconnecting the battery which discharged the capacitors inside the ecu which also supply some part of the memory....................................
Keeping in mind that the ecu has performed fine until the issue started.
Because i have no practical experience with these cpu resets i asked Peter B ( who does have some experience professionally ) in a recent email and he responded that it is a POSSIBILITY in some ecu's.

So has the replacement of the iacv whilst disconnecting the battery ( which could be the key operation ) fixed this??

I think it is at least worth trying to disconnect the NEGATIVE terminal of the battery AND connecting it to the still connected positive terminal ( perfectly safe to do it this way ) thereby discharging the ecu capacitors for an hour or so and see if doing so changes the behavior of the bike.

The ecu memory consumes a minuscule amount of power so it takes time to " sink " all electrons inside the ecu to ground and erase the memory.

So in conclusion the ecu which is now available does fix this problem @ 500.00 us but it may be worth investigating if the battery reset also works for no dollars for some period and then can be repeated if the situation requires it and helps other future members, at this stage we simply don't know!.

Not a short reply but worth a try i think,

up to you.
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Messages In This Thread
RE: CB1100 Idle speed instability problem - by max - 07-19-2023, 03:59 AM

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