2008 Silverado, 63,000 miles, 5.3, 4L60E, 3.73, NON Flex Fuel, with AFM, seems to run very well, but shows a LOT of KR at random times all over the datalogs
My old 2002 5.3 Silverado (same drivetrain numbers) allowed a good amount of timing before any hint of KR, was tuned for towing and 87 octane.
I thought a log I took yesterday (first one for this vehicle), was showing false knock, and of course it's a tad too large to attach here, so this morning, took another log, halfway to work, with 87 octane, then filled (1/2 tank to fill), with 93 octane, to see if KR disappeared, or minimized.
If anything, it showed more often KR.
I bought the truck from the original, older owner, so highly doubt there's ever been any "tuning" done to it.
I just don't get why there is so much KR?
Can anyone shed any light, or point me in the right direction?
Not asking for a free tune. I just have never seen so much KR on a stock vehicle, and am hoping someone with more experience than I, can take a look and offer an opinion.
LOG 111111 is 87 octane
LOG 222222 is 93 octane (mixed w/half tank 87)
p.s.
Pay no attention to WIDEBAND reading. Just got the truck and wideband is showing it's DEFAULT, since it is not connected yet.