IAC problems
IAC problems I have a Texas Speed PTM 92mm throttle body and have been having some trouble getting my car to idle right. In the course of figuring it out I've noticed my IAC plunger doesn't actually extend to the point where it seats in throttle body and completely closes off the IAC passage. Anyone ever had this problem? I don't know if my IAC is bad or what. When I command it to 0 steps it looks to be 2-3 mm short if seating.
So if anyone ever comes along and reads this....
A few things actually ended up solving my problems. I had to drill out the IAC passage in my throttle body as the back side was fairly small. This made my idle much more stable. I added air to the throttle cracker in the 1000rpm column from 12 - 0 mph and this stopped the dipping idle coming to a stop. I also changed the decay rate so it took air out slower.
I was also fighting low rpm bucking in 3 and 4th gear. I finally thought to look at my TCC lockup settings and realized that it was still set to lockup at those speeds. I changed the lockup to 4th only above 43 mph and problem gone.
Car now drives like stock with just a little higher idle.
A few things actually ended up solving my problems. I had to drill out the IAC passage in my throttle body as the back side was fairly small. This made my idle much more stable. I added air to the throttle cracker in the 1000rpm column from 12 - 0 mph and this stopped the dipping idle coming to a stop. I also changed the decay rate so it took air out slower.
I was also fighting low rpm bucking in 3 and 4th gear. I finally thought to look at my TCC lockup settings and realized that it was still set to lockup at those speeds. I changed the lockup to 4th only above 43 mph and problem gone.
Car now drives like stock with just a little higher idle.
