G oog le BadWeB | Login/out | Topics | Search | Custodians | Register | Edit Profile

Buell Forum » Big, Bad & Dirty (Buell XB12X Ulysses Adventure Board) » IAC check « Previous Next »

Author Message
Top of pagePrevious messageNext messageBottom of page Link to this message

Mark_weiss
Posted on Wednesday, December 19, 2018 - 03:56 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

The last few mornings have been in the 30s and my Uly has been difficult to start and initially runs poorly. Today I realized that once started, the engine is not running at an elevated idle (I know, how did I miss that?) but at normal idle right away. This sounds like the IAC is not functioning.

Is there an easy way to test the IAC or do I have to remove the airbox and take a look? No CEL so far and once warmed up the bike runs fine.
Top of pagePrevious messageNext messageBottom of page Link to this message

Griffmeister
Posted on Wednesday, December 19, 2018 - 11:45 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Unless someone else has an idea it looks like you already know your options. Thinking logically, if thereís no code then the ECM thinks everything is working fine electrically. This would indicate a mechanical fault such as the sticking you suggest. If this is the case, I would think youíd also see a difference between clutch in and out even when warm. Normally when you come to a stop and hold the clutch in, the idle will be higher than if you put it in neutral and let the clutch out. If thereís no change then it may very well be sticking. Hopefully somebody knows a test where you donít have to take anything apart.
Top of pagePrevious messageNext messageBottom of page Link to this message

Ourdee
Posted on Thursday, December 20, 2018 - 12:22 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

If you come to a stop with the clutch lever in and the bike in first gear, as you let the lever out the engine RPMs should go up with out twisting the throttle.
Top of pagePrevious messageNext messageBottom of page Link to this message

Hughlysses
Posted on Thursday, December 20, 2018 - 09:31 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

If itís the IAC, you may be able to remove it and clean it by spraying carburetor cleaner through it. IIRC, the mist from the rocker cover breather hoses is known to foul them up.

If you want to replace it, I think someoneís identified an auto unit that will work, so that would be worth investigating.
Top of pagePrevious messageNext messageBottom of page Link to this message

Swanthog
Posted on Thursday, December 20, 2018 - 09:33 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Hi, Mark.
I had this same issue and am presently working around it by disabling closed loop mode (https://www.buelltooth.com/open-loop.html).
There is no IAC valve on my 2006 Uly only a TPS sensor and idle control cable (maybe added later years?)
Here are some useful snapshots from the manual freely available here (https://www.manualslib.com/download/804797/Buell-Ulysses-2006.html):











Top of pagePrevious messageNext messageBottom of page Link to this message

Falloutnl
Posted on Thursday, December 20, 2018 - 10:40 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

I had a 2009 Scg that wouldn't idle properly. I replaced the IAC at the cost of almost 200 euro. Didn't fix the issue. That annoyance, plus the fact I never loved the way it handled, added up to me selling the bike.

Sorry, not a helpful comment other than maybe the suggestion that you try everything else before replacing that expensive IAC part.
Top of pagePrevious messageNext messageBottom of page Link to this message

Mark_weiss
Posted on Friday, December 21, 2018 - 05:52 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

My bike has no idle quality issues. The problem occurs only during cold start conditions. I have only just noticed that the startup idle is not at 1500 rpm or so, but at 1000 (indicated). In the past, startup idle would be around 1500 and within a minute or two would drop to about 1200. Sometime after that, idle would settle at a bit over 1k.

This morning the bike started slow, jumped to about 1400 within a very few seconds, then tapered to about 1k. I think that after 78k miles, the IAC is hanging up when it is cold. I will look into cleaning the valve.
Top of pagePrevious messageNext messageBottom of page Link to this message

Falloutnl
Posted on Friday, December 21, 2018 - 05:59 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Yeah, if anything, it's really easy to get to and try to clean. Who knows, it might fix your issue.
Top of pagePrevious messageNext messageBottom of page Link to this message

Swanthog
Posted on Friday, December 21, 2018 - 06:01 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

I'm at a loss. Can someone show me where the IAC is on this bike? (have a page from the manual?)

Thanks!
Top of pagePrevious messageNext messageBottom of page Link to this message

Falloutnl
Posted on Friday, December 21, 2018 - 06:14 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Like you said, your '06 Uly doesn't have it. On post '08 bikes it's located next to the throttle body.

(It kinda looks like a tiny inverted oil pump, in black).

(Message edited by falloutnl on December 21, 2018)
Top of pagePrevious messageNext messageBottom of page Link to this message

Swanthog
Posted on Friday, December 21, 2018 - 08:10 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Thanks, Falloutnl.
My experience with IAC valves on on cars is the car will die when coming to a stop. This has been the failure mode every time.
Top of pagePrevious messageNext messageBottom of page Link to this message

Froggy
Posted on Friday, December 21, 2018 - 10:58 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Same thing happens on the Uly should it really fail. If it is just acting up it won't idle right, but the the throttle plate is too closed to keep the bike running with the IAC completely cutting off air.

I've seen it taken apart, cleaned and rebuilt with success
Top of pagePrevious messageNext messageBottom of page Link to this message

Sharkguy
Posted on Saturday, December 22, 2018 - 05:53 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Here is the IAC clean out procedure I documented back in 2011. Maybe it will help.
http://www.badweatherbikers.com/buell/messages/142 838/634269.html
Top of pagePrevious messageNext messageBottom of page Link to this message

Mark_weiss
Posted on Sunday, December 23, 2018 - 02:46 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

I had the IAC out this morning. Before removal I swtiched the bike on and I could hear and feel that the stepper motor was running. With the valve out, everything looked quite clean. I still wiped things down before reinstalling the valve and checking its operation. The IAC works by fully extending the plunger and then presumably retracting it a programmed amount. Everything seemed to work today, but it was over 50f while I was doing this. I'll see what happens tomorrow when it's about 38F.
Top of pagePrevious messageNext messageBottom of page Link to this message

Mark_weiss
Posted on Friday, December 28, 2018 - 01:59 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Seems to be working again.
Top of pagePrevious messageNext messageBottom of page Link to this message

Falloutnl
Posted on Friday, December 28, 2018 - 03:59 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Well, that's good news. Great work!
Top of pagePrevious messageNext messageBottom of page Link to this message

Mark_weiss
Posted on Monday, December 31, 2018 - 05:36 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

I decided to check the IAC performance when the clutch switch button was pressed in. Nothing happened. I checked that the clutch switch enabled starting-in-gear, so it seems that the switch is OK.

More to investigate.
Top of pagePrevious messageNext messageBottom of page Link to this message

Griffmeister
Posted on Monday, December 31, 2018 - 11:21 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Did you put it in gear, too? Iím not sure now but maybe the difference is between clutch in/in gear and clutch out/in neutral. Donít quote me on that.
Top of pagePrevious messageNext messageBottom of page Link to this message

Ourdee
Posted on Monday, December 31, 2018 - 11:44 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

I think dif. is running in gear with clutch in -vs.- running in gear with clutch partial release. That is if you want it the IAC to move.
Top of pagePrevious messageNext messageBottom of page Link to this message

Mark_weiss
Posted on Tuesday, January 01, 2019 - 05:00 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Yes, the bike was in gear to check the IAC response to the clutch switch. When in Neural the idle speed should not change if the clutch lever is let out. In gear, the idle speed should increase when the switch's button is pressed in.
« Previous Next »

Add Your Message Here
Post:
Bold text Italics Underline Create a hyperlink Insert a clipart image

Username: Posting Information:
This is a private posting area. Only registered users and custodians may post messages here.
Password:
Options: Post as "Anonymous" (Valid reason required. Abusers will be exposed. If unsure, ask.)
Enable HTML code in message
Automatically activate URLs in message
Action:

Topics | Last Day | Tree View | Search | User List | Help/Instructions | Rules | Program Credits Administration