mmtetz

I was wondering if anyone knows why my truck always revs high on start up no matter what the temp its over 2000rpm for about 2 seconds then drops down to normal. Im sick of hereing that thats the way they are, Ive owned alot of vehicles never had this problem???? not getting any codes

Good old Bill

Everybody is right. Over 2,000 RPM is excessive, wouldn't want it on my engine. But yes, a higher fast idle is required 1400-1600 is closer to normal. The computor sets the IAC, which is malfunctioning is the question I can't answer. Good luck, perhaps the proper tech advice will be along.

oneFITTYman

I agree with bill, I had the same problem with my '01. The "IAC" Idle Air Control" Was sticking. I thing I would start there also. Another thing to try is, spray all your vacume lines and intake plenums for a leak, could be sucking in to much air, In return causing the high Rpm.

mmtetz

Thanks for your input, Ill have to did a little deeper into it

twrh111

pictures, we need pictures man. : ) seriously if someone could post a pic of what the iac is and location and any other pertinate info would be appreciated.

Good old Bill

Location of IAC is on the throttle body. Find the accelerator cable, it attaches to the throttle body. Bolted to it is the IAC, just a little bigger then 2 D cells batteries.

torkum

mmtetz

Right Hand Side Of The Throttle Body, Its The Only Round Bolt On Part There Is, You Can See It In The Pic Above

rampage12

my 02 5.4 looks nothing like this so where is my IAC located tring to clean it because my idle jumps up and down a few hundred when idleing ...any help where to find it? the right side of throttle body has throttle position sensor

rampage12

think i found it..its on the back of manifold behind plenum how do i go about checking vac lined for leaks what do i spray on them?