Really high idle

[Nachodaddy]

Just to eliminate confusion, you are talking about Throttle Position Sensor (TPS) here and not Tire Pressure Sensor (TPS), right? Not trying to be funny or difficult. Thanks.

[Lord Popgun]

Yes Nacho. Throttle Position Sensor.

It is being discussed as it is not available as a separate part for our bikes.

[max]

Gordo before you change anything to your tps write down the voltage on the middle pin with throttle close and fully open.
Just checked mine and it reads 0,489 volts closed and 3.971 volts fully open, just like Sportsterdoc mentions.
When disconnected the red/black center wire measures 0.024 volts and the orange light blinks, don't worry about this, when the key is switched off and back on again ( with the connector back in place ) it will stay off.

The way to check this is disconnecting the connector ( much easier than having the connector connected ), inserting a test pin in the middle contact ( you can use a folded open paper clip for this ) push it in right beside the red/black wire until it stops at the contact, plug the connector back in and note down the values for later, you only get the chance once before any adjustments are made.
The tps is the electronic equivalent to a needle on the slide of a carburetor and informs the ecu what the fuel air ratio should be for each position.

More interesting is that the engine idles at 1050 rpm, if this happens with the new replaced iacv that could mean ( but not necessarily is ) that the iacv is operating which you proved by connecting it externally and it rotated as expected.

One thing to note is that one member had a high idle and he discovered that one of the contacts in the tps connector was rotated by 90 degrees, once inserted correctly the problem was solved, just something to check, he did post a very clear picture of this somewhere early in the thread.

If that is the case study how the connector itself is taken apart before damaging it trying.

And Dave, the best way to test the iacv is as shown in the video which Gordo has done, saves confusion.

[Gordo_imp]

Yes.. the the throttle position sensor. Sorry for the confusion.

Titus 2:13
2013 HONDA CB1100
Thanks guys I'll test it in the morning when I get home.

Titus 2:13
2013 HONDA CB1100

[SportsterDoc]

I doubt a replacement will be necessary, but if the Rune forum is correct, 16060-MBZ-A11 is available.

https://www.bikebandit.com/oem-parts/det...11/b584912

I mentioned the throttle position sensor only to reference voltages, which can easily be checked.

[Gordo_imp]

I doubt a replacement will be necessary, but if the Rune forum is correct, 16060-MBZ-A11 is available.

https://www.bikebandit.com/oem-parts/det...11/b584912

I mentioned the throttle position sensor only to reference voltages, which can easily be checked.

Thanks. Looks like I've got some work ahead of me

Titus 2:13
2013 HONDA CB1100

[Enzofour_imp]

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?

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?
I replaced it with 16430-MFJ-D01 for 2014 models, I have traveled 7,000 km and no problems have been encountered.
But they also applied the modification released by Honda at the time to the ECU.

[Lord Popgun]

I’m putting that part number in my service manual this time. Didn’t last time couldn’t find it recently and wasn’t going to read all those idle problem posts

[peterbaron]

I’m putting that part number in my service manual this time. Didn’t last time couldn’t find it recently and wasn’t going to read all those idle problem posts

U R high skilled tech and troubleshooter, no need to memorize or make any notes.... just straight diags

[dave]

Dave in San Diego?
[/quote]

I replaced my defective IACV with part number 16430-MFJ-D01. I have traveled 12,000 miles and no problems have been encountered.