Ok, here is the low down. I have 2006 Chevy Silverado 4.8l with a sts turbo kit with upgraded injectors and only pushing 5psi. I have had the kit on the truck for about 2 years now with no problems. Tonight on my way to my brothers house from work I hooked up the scan tool to monitor my truck. While cruising down the free way I was keeping a eye on the scan tool, boost gauge, and wide band gauge. I give the truck some boost and everything seems normal. No bad o2 readings, no over boost, and no knock. As I get down a little further down the road I see the knock reading move up .50-1.00kr and this was not under any boost. Right then I am thinking maybe false knock. So I give it some boost, maybe half throttle and see nothing on the knock reading. So now, I am certain it is false knock. Well as I progress down the free way this time under more boost I see the kr reading hit 2.10 with a good o2 reading from the wideband. Now I know this can't be false and I have a problem. Throught out the ride to my brothers I kept it out of boost and saw no knock. Well on the way back to my house I would play around with a little boost to make sure I was not getting any false readings. So every so often I will give the truck boost but not under any wide open blasts. Some times I would see little knock on a pass maybe .20- 1.12kr and other times I would see nothing. So my question is am I seeing false knock? Is there any way for me to determain that this is a false reading? Any info to shed some light on the subject would be great.