what should my 4.0 idle at??

[nine-teen91stxranger]

i have a 91' 4.0l in my ranger, 5spd 144k miles and i was wondering what should my idle speed be at? now is sits at about 950-1000 at idle. that just seems way too high. and how would i go about turing it down?

 

[nine-teen91stxranger]

over 50 people read this thread and not one answer? come on...

 

[Teddyzee]

idle set screw.

 

[nine-teen91stxranger]

where would that be at???

 

[aspevacek]

Look at the emisssions calibration label under the hood of your truck. It should give you the information but will tell you it is not adjustable. I would remove the air intake boot from the throttle body and see if it is all carboned up and infact keeping the butterfly from returning to a full closed position. mos tof the time that or an iar idle control causes a fuel injected vehicle to idle higher then it should.