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Idle Air Control Valve (IACV)
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Dave Offline
High Mileage

San Diego, ca
Posts: 934
Joined: Jan 2014
Post: #1
Idle Air Control Valve (IACV)
Hi all. I am asking for some feedback from as many members as possible, please. My 2014 Dlx suffers from an intermittent fast (1,500 RPM) to slow (500 RPM/stalling) idle condition. This condition has been discussed by multiple members of this forum and I am seeking some feedback to help in my diagnosis. I suspect the Idle Air Control Valve (IACV) is the root cause of my problem, but I am not convinced. The Honda service manual describes a quick and easy test that I am asking members to perform, and to then post their results. My bike has never passed this test (described below), but whether it passes or not it may or may not run perfectly (right now it is running perfectly). Here's the test: With the engine stop switch (on RH handlebar) in the on position, turn the ignition key on while listening for the IACV step motor to cycle. The IACV is located on the RH side of the bike, between the outer-most throttle body and the cylinder. Can you please perform this test and let me know if you can hear a step motor cycling momentarily? I have never heard a sound (the service manual says I should), but most of the time my bike runs perfectly regardless. Your feedback is appreciated. Thank you.
(This post was last modified: 07-23-2016 08:57 AM by Dave.)
07-22-2016 05:55 PM
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Ulvetanna Away
Road Warrior

USA
Posts: 1,696
Joined: Apr 2016
Post: #2
RE: Idle Air Control Valve (IACV)
my bike has always made this sound

all my bikes make this sound as they are all EFI

no sound means there is a problem

fuel pump may or may not come on but that is a different sound
07-22-2016 07:06 PM
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Lord Popgun Offline
I find your lack of RLETs disturbing

Virginia Beach
Posts: 10,442
Joined: Apr 2013
Post: #3
RE: Idle Air Control Valve (IACV)
I just did the test. You have to put your ear pretty close to the Throttle body on the right side of the engine. Turn on the switch and you will hear the fuel pump (or usually hear it as Ulvetana said) and hear the IACV. It makes a kinda fast clicking sound, but only for maybe a second. Maybe less that a second.

I did the test in my garage with no background noise. The clicking or racheting sound wasn't very loud.

If you come to a fork in the road, take it!
2013 CB1100
2012 ST1300
Holder of the CB1100Forum Secret Decoder Ring
07-23-2016 06:06 AM
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EmptySea Offline
Lives On Two Wheels

Chicagoland, USA
Posts: 7,004
Joined: Jun 2013
Post: #4
RE: Idle Air Control Valve (IACV)
Turned the ignition key with the engine cutoff switch OFF...no sound whatsoever. Flipped cutoff switch to ON and heard the clicking sound which popgun describes along with the fuel pump.

Went back to my service manual and the test requires the cutoff switch to be ON not OFF as you describe in your original post.

MTC

"If you can’t go home again, at least you can enjoy the ride” — Peter Egan


2013 CB1100 non-abs
2013 CB1100 abs
(This post was last modified: 07-23-2016 07:03 AM by EmptySea.)
07-23-2016 06:56 AM
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Lord Popgun Offline
I find your lack of RLETs disturbing

Virginia Beach
Posts: 10,442
Joined: Apr 2013
Post: #5
RE: Idle Air Control Valve (IACV)
ES, Actually that is how I did it. Was easier to reach the cutoff switch than the key while my head was by the throttle body Smile

If you come to a fork in the road, take it!
2013 CB1100
2012 ST1300
Holder of the CB1100Forum Secret Decoder Ring
(This post was last modified: 07-23-2016 07:05 AM by Lord Popgun.)
07-23-2016 07:04 AM
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Dave Offline
High Mileage

San Diego, ca
Posts: 934
Joined: Jan 2014
Post: #6
RE: Idle Air Control Valve (IACV)
Thank you all for your replies. I was wrong, the on/off switch should be in the "ON" position - I'll go back and check mine. I'll get back and let you know if I hear a clicking sound. Please keep the replies coming.
07-23-2016 07:31 AM
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dsinned Offline
Running Like a Top

San Jose, CA
Posts: 340
Joined: May 2016
Post: #7
RE: Idle Air Control Valve (IACV)
With cutoff switch "off", mine make no sound whatsoever as I turn "on" the ignition key switch. But when I toggle the cutoff SW to "on", I DO hear the sound of the fuel pump priming the system. I'm not sure if there is suppose to be another sound coming from the IACV at the same time, but I don't think so.
(This post was last modified: 07-23-2016 07:38 AM by dsinned.)
07-23-2016 07:37 AM
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Lord Popgun Offline
I find your lack of RLETs disturbing

Virginia Beach
Posts: 10,442
Joined: Apr 2013
Post: #8
RE: Idle Air Control Valve (IACV)
There is. It cycles as part of the ignition on secquence. It in the service manual.

If you come to a fork in the road, take it!
2013 CB1100
2012 ST1300
Holder of the CB1100Forum Secret Decoder Ring
07-23-2016 07:40 AM
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dsinned Offline
Running Like a Top

San Jose, CA
Posts: 340
Joined: May 2016
Post: #9
RE: Idle Air Control Valve (IACV)
. . . details, details, DETAILS.

Okay, I repeated the test, this time with the ignition key SW already On, then turning On the cutoff SW with my ear close to the RHS. Now, I can hear a faint ticking sound for about a second coming from the IACV, AND at the same time, the other sound of the fuel pump priming the system for a few seconds longer.
(This post was last modified: 07-23-2016 07:46 AM by dsinned.)
07-23-2016 07:44 AM
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Lord Popgun Offline
I find your lack of RLETs disturbing

Virginia Beach
Posts: 10,442
Joined: Apr 2013
Post: #10
RE: Idle Air Control Valve (IACV)
There ya go! Thumbs Up

If you come to a fork in the road, take it!
2013 CB1100
2012 ST1300
Holder of the CB1100Forum Secret Decoder Ring
07-23-2016 07:59 AM
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