This is topic Hanging idle in forum Tech Talk at Northern California Ford Owners  .


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Posted by Bullitt3905 (Member # 905) on :
 
Recently cleaned my IAC then replaced it because the idle was running choppy upon letting off accelerator and coasting.
After replacing it I used some throttle body cleaner and got the build up from around the edges of the throttle opening and butterflies. When i started it up the idle hangs at 1500 rpm. It will also sit at 1500 rpm when I'm coasting until I come to a stop then settles to 900. I also replaced the TPS WITH no luck. I checked the vacuum lines and they seem to look ok. I also readjusted my CAI and my maf looks clean. Any ideas? No engine codes are coming up on the dash diagnostic.
 
Posted by Fostang (Member # 3752) on :
 
You probably just need to close the throttle blade a bit and adjust the tps.
 
Posted by rollininmy50 (Member # 9067) on :
 
When you replaced the Tps did you Recalibrate it?
 
Posted by Bullitt3905 (Member # 905) on :
 
Nope. That's looking like my problem. In going to adjust voltage when I have a chance
 
Posted by The TASM (Member # 292) on :
 
This worked on my 95 5.0. Cheers mate!

http://www.cjponyparts.com/ford-idle-air-control-adjuster-5-0l-1986-1993/p/HW2451/
 
Posted by Bullitt3905 (Member # 905) on :
 
Looks like the TPS is way high reading at 1.73v. How do adjust it? There's no way to drill wider holes on this one.
 
Posted by Bullitt3905 (Member # 905) on :
 
Bump? Any other way I can fix the idle?
 
Posted by Fostang (Member # 3752) on :
 
Have you tried closing your throttle blade [Embarrassed]
 
Posted by danterakin (Member # 14040) on :
 
Happened with my Bullitt. If you did not change your IAC with a Motorcraft one, do that first because the solenoids end up failing after time. If replaced, check for vacuum leaks (spray carb cleaner near hoses and see if there is a change in idle because if it changes, you have a leak), and also check O2 sensors. I went and changed all my emissions to new Motorcraft and I still had my RPM hand. Put new intake gasket, EGR, IAC, Plugs, thermostat, temperatur sensor, a lot of changed. None of them worked, ended up being my O2 sensors went bad and it fixed my issue. I'd bet anything your issue is a old and bad IAC.
 
Posted by Bullitt3905 (Member # 905) on :
 
I'll try putting in anther new IAC.
 




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