Minimum air set procedure?
Thread Starter
Racer
Joined: Apr 2004
Posts: 306
Likes: 0
From: Cotati CA
Minimum air set procedure?
How do I do a minimum air set? I have an '89 Automatic with lots of mods (still have stock throttle body setup) and don't know where to look in the shop manual for the procedure.
Thanks!
Thanks!
Le Mans Master
Joined: Aug 2000
Posts: 8,838
Likes: 31
From: Australia
Team Owner
Joined: Jul 2004
Posts: 28,422
Likes: 3,275
From: Hartford WI
I have a method I prefer. I set it by IAC counts. Get everything into closed loop and stabilized. Shut everything but the engine off. Attach scantool. See what the IAC counts are. Target is 15-20. After the idle speed is already commanded by the ECM.
If the counts are more than my target, it means the throttle blades are not open wide enough. That means I should open them more. Turn the idle speed adjustment screw in.
If the counts are less than my target, it means the throttle blades are open too wide. That means i should close them some. Turn the idle adjustment speed screw out.
Each time I make and adjustment, I rev the motor up and let it settle.
This assumes that the timing is spot on. Another big assumption is that the command idle speed is correct. Obviously, if it is not, it could be hard to set.
If the counts are more than my target, it means the throttle blades are not open wide enough. That means I should open them more. Turn the idle speed adjustment screw in.
If the counts are less than my target, it means the throttle blades are open too wide. That means i should close them some. Turn the idle adjustment speed screw out.
Each time I make and adjustment, I rev the motor up and let it settle.
This assumes that the timing is spot on. Another big assumption is that the command idle speed is correct. Obviously, if it is not, it could be hard to set.
