2.3L ('83-'97) Idle question .....

[johnmw]

My 1997 Ranger with the 2.3L , 5spd has taken to doing a strange thing lately. Everything works great and it is it's usual dependable self. Coming to a stop in an intersection the idle stays up around 2200 -2500 until the rust bucket comes to a complete stop, then the idle slowly drops to 1000 to 1200. There are no error codes or anything to indicate a problem, just the idle speed is high till it is completely stopped. I took it up to 50mph, popped it into neutral and stopped and it stayed at 2200 - 2500 rpm till the truck completely stopped, then the idle slowly slowed down to 1000rpm.

Any thoughts on this ?.

Thanks

John

 

[tw205]

I had the same issue with my 98. It wasn’t a consistent thing, just on occasion. I recall unplugging the IAT sensor and the idle would come back down. Plugged it back in and she was fine for a week or month. It’s been a while but I think it was in colder weather. It quit doing it so I never investigated if further.

 

[Jazzer]

Mine did a similar thing, increasing rpm idle for seconds after a stop, sometimes depressing the clutch would settle it down. It was the Idle Air Control.

-Jazzer

 

[scotts90ranger]

I remember hearing something about that relating to one of the speed sensors, I don't remember if it's the one on the rear axle or on the side of the transmission...

 

[johnmw]

Well, finally got time to work on things ...... Replaced the IAC valve, no change. I guess the speed sensor in the differential will be next. Had a local shop tell me they could fix it, $ 100 per hour plus parts. Like F#*$.