Hi guys, I'm working on fine tuning the IAC routine with my choppy hydraulic cam (110 lobe separation, 310 adv duration). The car idles a little too low when very cold, excellent when it is not 100% warmed up, and it creeps up and exceeds target when hot.

I'm curious what the "IAC minimum/maximum keep alive" constants are in Tunerpro. They are set at min 159 deg max 219 for my 89 vette-based manual bin. What is this keep alive routine? Why would it be needed only in the "warm engine" range? How is "keep alive" different from the 3 step stall saver routine that I also have?

I lowered mine to be more in synch with what my car sees when being driven..

If u do a search, I posted on this subject and there was some informative info there.

It appears that the tables are just what they are called. You can lower the min. so it learns the iac sooner. I also believe that the settings vary a fairly decent amount from the y to the f platform bins

later
Jeremy

Couple other things to try(sorry its early and a sat.)

Set your minimum IAC when hot at 0 or single digits for your IAC count at your desired hot idle rpm.

Also there are multiple step counts vs. temp etc. for the IAC functions and a max park count. U can slowly play with these and try and bring your rpm closer to the desired range.

Minimizing the effect of the IAC seems to help the most when striving for the best idle.

You can also try decreasing the idle advance/retard timing that the factory uses to help stablilze the idle. The more u lessen the IAC effects and the larger cams(from what i have seen), the less advance/retard u need to stem idle fluctuation..

There is alot of info on IAC functions , and a lot to know

later
Jeremy