So I'm slowly starting to tune my '11 Sierra with the AFM 5.3. I'm only making one change at a time, logging, then adjusting before I move on to the next change.
The first thing I did was adjust the PE table. I made it 1.18 across the board above 2500 rpm. After loading the tune and logging, I got 3-6* of KR starting at ~4400 rpm in 2nd gear and it never let up until I let off the gas. Logged again, same result. So I changed all the 1.18 to 1.2. Same result. Changed 1.2 to 1.25. Same result.
Then I said hell, I wonder if the stock tune shows the same thing. So I loaded the stock tune and sure enough, KR shows up in the same spot.
The truck is bone stock except a Magnaflow muffler (obviously not making a difference). I don't think its false knock, but I guess I have no proof. This is all on 89 octane, which might be the issue, but you'd figure a stock truck on a factory tune wouldn't show knock with any octane.
Suggestions?