So i tryed adjusting the minimum air today. put paper clip in for 30 seconds, disconnected iac and spark advance. Connected a scanner to see the rpm, and it showed the iac at 0, but with the throttle/air adjusting screw turned all the way back w/o even touching the throttle the lowest idle i could get was 1200 rpm
I set the timing yesterday and it was advanced 10 degrees so i put it down to 6 degrees thinking that would be why the idle was too high, but it wasn't. It says to get the idle down to 450 rpm, is that correct?? maybe they meant 1450??

 

what about the screw thats on the back of the butterfly on the tb? ( im remebering from my v6, my l98 isnt home at the moment )

 

800-1200rpm is typical in P or neutral, 450rpm in gear is good for some builds.
I should mention that is where my car idles, not the specifications of idle speed.
The adjustment screw could be the rascal like 2.8 said! There is a sticker under
the hood of the factory LB9 settings.

 

Yep that screw on the throttle body is the one i adjusted...

Here is the link to the tech article that i used https://www.thirdgen.org/tpimod2

 

what about the one in the idle air control valve

 

Theres no adjustment screw on the IAC.

 

So no one knows how to adjust the minimum air on these cars anymore???? I really need to get it adjusted correctly because now it stalls when i put it in reverse...

 

After you install the IAC run the car to operating temperature. Once warm, shutoff the car, jumper A/B on the ALDL for field service mode. Turn the ignition on for 30 seconds to allow the IAC to reset. While the ignition is ON, disco the IAC. Pull jumpers, start motor. Adjust idle setscrew to 400 rpm for an auto, 450 for manual. Shutoff car, reconnect IAC. The ecm now has control over the idle again and will step the IAC to compensate. Personally, it never works for me and I just bump up the setscrew for 1k rpm in park, and 500-600 in drive. Depending on what all was done with your car before you probably wont reach manufacture recommended idle...

 

PLAIGARISM! lol

 

LOL! It is so clear and concise! I knew something was fishy!

Unless he stole it from you, but it does sound familiar!

 

I knew it! ..I was just in the southwest boards! Your a rascal 91Z!

 

LOL, it's not plagarism, it's simply "re-posting the correct info"... Hahahahaha!

 

cool I will get this set next week sometime. I cleaned the iac and some electrical connectors and that seemed to help.

 

kcallais I am just quoting a genius!!! hehe

 

There's no reason (given every thing is in order) why you can get it down to 450, my 383 with a mild cam has no problem idling down to 450 using the procedure however, After I warm up the engine I disconnect the "Set Timing Connector" so the ECM can't change the timing which affects idle speed. This is the only step that is different from the manual and what has been posted.

 

So you got it down to 450 rpm with it in park???

 

I hardly doubt that, I mean it could.. but, then itll fart on itself in gear Id imagine.

 

Well i got the idle set correctly and it was way to low before.
It was tricky to get it to idle around 400 but i got it.
Now when its warm and i start it it almost stalls but catches itself? I think i will try replacing the cap and rotor and wires( i put new plugs in last year) and maybe the coil. What do you guys think?