Quote Originally Posted by Roadknee View Post
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 had a 4L60E that was causing false knock retard only in 2nd gear. It would show up to 8° of retard in 2nd gear that would instantly vanish under heavier load in 3rd gear.