I have been running into some very odd iac problems with my car. i have tried 3 different iac's and had the fast box checked, with no problems found. Set the fast to 900 rpm warm idle. Drive the car and the idle is 1200,after 10 min driving. Shut off the car and restart its 900 rpm where its supposed to be. I have played with the idle screw on the tb , and watched the iac counts to make sure its not too far out of range from being open and closed. Maybe my iac housing is worn and the plunger is getting hung up. The ford iac system uses a injector type pwm output, which i heard gives real good stable idle control. Anyway to use the ford iac on a fast system?
Also when cold the idle sometimes sits at 800 rpm and stalls, even though i have it set for 1350 rpm, other times it will come up to the set rpm. A very intermittent problem, which is frustratiing
Also when cold the idle sometimes sits at 800 rpm and stalls, even though i have it set for 1350 rpm, other times it will come up to the set rpm. A very intermittent problem, which is frustratiing