Thanks guys. David - I'll check the linkage tonight. I did a minor adjustment on the stop screw and the microswitch screw yesterday, but I didn't think to re-adjust the link arm. I can see how operating temp might affect this linkage and the throttle plates, but the idle does immediately drop to normal when I unplug the idle speed motor, so I'm not so sure... Chris - I'm sure I already know what will happen when I unplug the ECU, Idle will drop to normal. I've already tried this by unplugging the idle speed motor(s). I know the ECU is telling my idle to run fast, but I'm not sure that indicates a defective ECU, it may be that the ECU is getting bad data from a switch or sensor. Since the problem only happens if the engine is at full temp, doesn't that point toward the temp sensor? When the car is first started and until it reaches full temp it idles perfectly, all the time. Once it's hot the idle will stay high about 20% of the time, and the other 80% of the time its normal. What are the failure modes for the temp sensor, and their effects? Besides the throttle microswitch and the temp sensor, are there any other inputs that affect the logic of the Idle ECU? Tom From: dmcnews@xxxxxxxxxxxxxxx [mailto:dmcnews@xxxxxxxxxxxxxxx] On Behalf Of David Teitelbaum Sent: Thursday, October 09, 2008 11:02 AM To: dmcnews@xxxxxxxxxxxxxxx Subject: [DML] Re: High Idle only when warm David Teitelbaum >Check out the Quadrant Link. Chris > When the idle is high just unplug the ECU. If it drops to normal you've found the problem. --- On Thu, 10/9/08, Tom Tait <TTait@xxxxxxxxxx <mailto:TTait%40BRCWEB.com> > wrote: From: Tom Tait <TTait@xxxxxxxxxx <mailto:TTait%40BRCWEB.com> > Subject: [DML] High Idle only when warm To: dmcnews@xxxxxxxxxxxxxxx <mailto:dmcnews%40yahoogroups.com> Date: Thursday, October 9, 2008, 9:39 AM Hi all. I've got an idle problem that has cropped up. When the engine is at full temp, and I push in the clutch the idle will occasionally stay high, sometimes 3000 rpm, sometimes around 1800. This is repeatable but intermittent. The car operate perfectly when the car is still warming up. The throttle cable/spool have returned to fully closed even while the RPMs are high. Nothing appears to be binding. The microswitch for throttle-closed is operating properly and properly adjusted. The idle speed motor is less than a year old. I swapped on a Volvo idle speed motor and there was no change. The temp sensor for the idle speed ECU is about 3 years old. The wire to this temp sensor had been previously damaged, and it has been spliced. I could swap the ECU with the other car, but I wanted to get input from here first - I prefer actual troubleshooting to just blindly swapping parts whenever possible. I suspect that this is related to my temp sensor or the splice in its wire. Suggestions as to where to look next would be appreciated. Tom [Non-text portions of this message have been removed] ------------------------------------ To address comments privately to the moderating team, please address: moderators@xxxxxxxxxxx For more info on the list, tech articles, cars for sale see www.dmcnews.com To search the archives or view files, log in at http://groups.yahoo.com/group/dmcnewsYahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/dmcnews/ <*> Your email settings: Individual Email | Traditional <*> To change settings online go to: http://groups.yahoo.com/group/dmcnews/join (Yahoo! ID required) <*> To change settings via email: mailto:dmcnews-digest@xxxxxxxxxxxxxxx mailto:dmcnews-fullfeatured@xxxxxxxxxxxxxxx <*> To unsubscribe from this group, send an email to: dmcnews-unsubscribe@xxxxxxxxxxxxxxx <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/