1995 K1500 LO5 tuning- Autoprom

[dave w]

I ran the tank of 87 octane very low and topped it off with Chevron 92. I don't have any WOT knock retard in first or third gears now, but still have up to 5 degrees in second gear. I've read where a worn tranny can cause this. I'm running the original 4L60E with 160K. Here's a datalog if anyone cares to look.

I looked at the data log for knock retard, nothing alarming. A few cells above 80 Kpa had an average knock retard of about 2 degrees. I can often eliminate knock by retarding spark advance by 0.50 degree increments in the cells that have knock.

dave w