f250 idles at 2500-3000 rpm - Ford Forums - Mustang Forum, Ford Trucks, Ford Focus and Ford Cars

dannyford · 01-28-2010, 17:27

hey fordies
my 91 f250, electronic fuel injected. just started idleing at 2500-3000 rpms
i thought maybe it was a vacuum leak somewhere so i took carb cleaner and sprayed around hose connections but no change in rpms. I was wondering what to check next. any suggestions appreciated.

**Bert** · 01-28-2010, 19:41

The IAC can hang and cause a high RPM. Is the throttle closing all the way? Does it idle that fast when cold? What engine is it.

dannyford · 01-31-2010, 14:14

hey bert
its a 350 windsor. idles high right off the bat. and yes the throttle is closing. do you think i should replace the iac?
thanks for the response
danny

**Bert** · 01-31-2010, 15:00

It could be the IAC but if you want to give it a quick check, tak it off and leave it connected. Plug the holes and see how fast it idles. If it trys to stall, the IAC is the problem or the leads.