You guys are way above my pay grade..
I would love to understand the hack process, and read a lot of these threads in awe. And get lost quick!

I would love to be able to set a closed loop target afr in these pcm's. Like in my K1500 16168625, setting this from 14.7 to 14.1 made a world of difference. Now that we have more ethanol added to our fuel which we didn't have as much of back in the early 90's. This does change our true closed loop afr.

I have tuned a few LT1 obd1 PCM's over the years and always wanted a richer closed loop target afr.

Just wondering if you have located this part of the diss-assembly?

Thank you,

Keith