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Jul 8th, 2005, 11:33 AM
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#1 | | Newbie
Join Date: Jul 2005
Posts: 1
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I have a 2002 Ultra Classic that will not idle consistently without opening throttle. At speed it runs fine. Is there some sensor that controls idle?
Thanks for any help!! | 
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Jul 8th, 2005, 02:52 PM
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#2 | | Administrator Has posted 500+
Join Date: Mar 2004 Location: Tucson AZ
Posts: 1,527 Interests: Fishing, wood working, flipping off Fred Fox Occupation: Founder of Bike Talk....retired and lovin' it
| TPS (Throttle Position Sensor) might be off
Intake leak is very likely>>> I would start with that. Easy to check for a leak. At idle warmed up, lightly spray WD40 on the intake flanges from the left side. An increase in idle speed will tell you that there is a leak. I no one has changed seals since new, I would fully expect a leaky intake.
The Manifold Absolute Pressure sensor (MAP) might be bad
Delphi uses the ECU to control idle but, if someone messes with the throttle stop screw.... | |
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Jul 12th, 2005, 07:01 AM
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#3 | | Rookie 10+ posts
Join Date: Jun 2005 Location: Texas
Posts: 15 Interests: vertical dancing, horizontal dancing, riding, photography Occupation: Attorney
| A recent service bulletin recommended a re-flash, for no charge, to address rough idle on some models. I seem to recall that the 2002 model was included. Check with your dealer for that service bulletin. Many dealers have not heard of it, but I have seen it.
TexasTripod | |
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Jul 12th, 2005, 02:31 PM
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#4 | | Rookie 10+ posts
Join Date: Jun 2005 Location: Texas
Posts: 15 Interests: vertical dancing, horizontal dancing, riding, photography Occupation: Attorney
| M-1162 Service Bulletin issued October 2004. That might be the ticket. Try this link. http://mysite.wanadoo-members.co.uk/...2ICMUPDATE.pdf
Texas Tripod | |
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Jul 12th, 2005, 07:25 PM
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#5 | | Has posted 500+
Join Date: Jan 2005
Posts: 827 Interests: Bikes, Boobs and Beer Occupation: Biker
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Yes sir, I know of a few folks that have gone down to the local-stealer for the re-flash, seems to be the thing to do, even if your bike is'nt running bad. Of course check for the intake leak too.  | |
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Jul 13th, 2005, 08:37 PM
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#6 | | 200+ posts and climbing
Join Date: Mar 2004 Location: Mankato, MN
Posts: 381 Interests: Motorcycles, Mountain bikes, guns, Hunting, fishing
| Another problem I've heard of that can affect this is not waiting for your bike to go through its system checks before starting it.
This was a reply from an EFI tuning professional concerning a similar problem...
"Most times with what you are describing is caused by the IAC (Idle Air Control) being out of whack. It is not uncommon for this to happen just from starting the bike too quickly. EFI needs to have fuel prime and IAC set itself BEFORE you hit the start button. The IAC needs to get into position completely, and sometimes if you start the engine prematurely, the starting point will be read incorrectly and all other positions for the IAC for all throttle and RPM ranges will be off. This will also happen if you do a rolling start after a stall. It also screws up the interaction with the TPS (Throttle Position Sensor). The next time you start it, just wait a few seconds and then hit the button, you will probably be OK. If not, unplug the ECU for a few seconds, plug it back in and cycle the on off switch, being sure to leave it on for at least 5 seconds before shutting it off. If this doesn't work, it is probably the ECU that may be failing, or a bad IAC or TPS starting to fail." | |
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