I have a 305 TPI with an LT1 cam. I'm using an '89 305 TPI auto trans bin and $6E mask in Tunerpro. The problem I am having is that my RPMs drop to around 500 when idling in gear. The engine almost feels like its going to die, but doesn't. It idles around 700-800 RPMs in park/neutral. I'd like to bring the RPMs up while idling in gear. What parameters need to be adjusted to do this?

 

What are your IAC counts when in drive? I suspect you need to increase that in bin a little. try 5 at first and see what happens.

 

Ronny, Where are you looking at to make those changes? What table?

Scott

 

Do you have a copy of the expanded XDF file for the $6E? Not sure if the regular file has it or not.

Idle can be tuned with idle speed vs coolant temp table but that will effect both drive and park idle speeds. To keep park/neutral speed, adjust the Idle Speed adder for Park/neutral in the Constants section. ARAP adds 50 rpm from drive to park.

You can try to adjust the IAC steps added to the throttle follower in Drive, in the constants section. ARAP is set to 5 so you may want to add more and see if that helps. I never played with that table however.

Another thing is possibly try increasing timing in the lower rpm 400-600 rpm areas. Increased timing will force engine idle to higher rpm, but first start with the various idle control constants and tables for now.

 

Thjere are two tables for IDLE vs coolant temp. One park one drive.