1993 ford f150 351

I change the IAC on now my idle is high. It is some were around 2gs. The part was brand new. If I unplug the IAC the idle drops. Thank you in advance.


Thank you

 

is that how high it idles all the time or just on cold starts? vacuum leak? have you ever messed with the idle adjustment screw.

 

no the rpms stay high constantly they dont drop, then i disconnect the IACV and the rpms drop to between 800 and 1100 but then the truck runs bad because it sounds like it wants to turn of also sometimes when i shift when its somewhat cold it will die, im not sure if it has a vac leak, how is the easiest way to check for one.

thanks

 

You're saying your base idle is at 2000 rpm's? That's pretty high considering it should be 650. You should be able to hear a hissing if the vacuum leak is that bad. But i'm gonna second the idea that the throttle stop screw was messed with.

 

Take back that peice of crap IAC you bought from the parts store and go pay $150 for one from Ford.

Better yet, have you pulled codes? Why did you change it in the first place?