This has been bugging me for awhile but I'll try to be brief. For the past several months I have been suffering these three (possibly) related idle problems with my, otherwise perfectly running, 93 SC.
1) Car does not want to idle upon a cold start. Will idle for 10-20 seconds and then try to stall and I need to play with the throttle for a minute or two for it to run on its own.
2) When warm and under normal driving nearly EVERY time I come to a stop and put in the clutch the idle goes up to about 1700-1800 as I approach the stop. It stays up there until I'm stopped for 5 - 10 seconds then slowly drops back to normal.
3) When warm and under normal driving after it sits at a long light, between 1 and 2 minutes, the idle will suddenly fall to about 500 from 850 and get rough. Again, I have to play with the throttle to get it smoothed out again.
These three things are driving me nuts. I can't find anything wrong. I've done all the usual diagnostics with no codes at all, can't find any vaccuum leaks, and recently replaced the IAC with a new Ford unit. There are NO driving problems whatsoever off idle.
Any more suggestions? Thanks.
Jon
1) Car does not want to idle upon a cold start. Will idle for 10-20 seconds and then try to stall and I need to play with the throttle for a minute or two for it to run on its own.
2) When warm and under normal driving nearly EVERY time I come to a stop and put in the clutch the idle goes up to about 1700-1800 as I approach the stop. It stays up there until I'm stopped for 5 - 10 seconds then slowly drops back to normal.
3) When warm and under normal driving after it sits at a long light, between 1 and 2 minutes, the idle will suddenly fall to about 500 from 850 and get rough. Again, I have to play with the throttle to get it smoothed out again.
These three things are driving me nuts. I can't find anything wrong. I've done all the usual diagnostics with no codes at all, can't find any vaccuum leaks, and recently replaced the IAC with a new Ford unit. There are NO driving problems whatsoever off idle.
Any more suggestions? Thanks.
Jon