Quote Originally Posted by Kyne View Post
This thread is full of win. You can't just adjust CL afr, while it may adjust the computer for a little while the PCM doesn't care about AFR it cares about stoich on the narrowbands so it will slowly correct itself back to stoich or lambda that's what closed loop is. Open loop will work and on some cars so will tuning the o2 switch points. The 04 GTOs did sneak over here with lean cruise in the calibration just not activated, they are pretty slick.

As far as running it when cruising and how it is for pistons and valves, you could run your engine on air at low load and it wouldn't damage anything. Knock happens during high load driving. When you are in a lean burn mode you need to add a few degrees of timing to compensate for the burn rate.
You can adjust afr in CL. I've done it on a Grand Prix.