So I just adjusted my TPS sensor, and as I was doing so, figured I'd try to turn the idle up a bit also. This is on an 88 GT, by the way. When I turned the idle screw, the idle would change for a moment, and then it seemed like the computer (IAC maybe) would take over, and put it right back where it was to begin with. At any rate, by adjusting the TPS and idle control, I was able to set the TPS voltage at .98, and the car is running well. My question is: What should the idle screw be adjusted to, if it doesn't actually control the idle? Does it matter where it is set, so long as it's not falling out, or causing a high idle?

 

its just for controlling where exactly you want it to idle i guess. like holds the throttle to a point that it will be open a certain amount. i guess its just where you want it to idle. mine changes my idle when i turn it. yours should too i believe.

 

I set my idle with the EEC.

Tweecer FTW.

 

the computer should not take over in that instance. if you turned the screw a quarter turn, it shoudnt do much of anything. you have to make several revolutions (or at least i have when i've done it 3 times) before something happens.

 

Thanks for the info, folks. I'm confused because my Chilton's manual explains how the EEC controls the idle speed, and that "no periodic adjustments are necessary or possible" with these cars. At any rate, you raise a good point, 95Stealth--maybe the threads on the adjustment screw are extremely fine, and it takes a bunch of turns to change anything. I wonder why my manual says otherwise though.

 

By the way, Horatio, how do you do that? With a tuner of some sort?

 

mine takes the settings from the screw. seems like it does anyways. my idle is always up and down from the mods and no tune for the eec.