Originally Posted by 02sierraz71_5.3

glad it worked out for you jerry, im not familiar with tuning fi engines but i bet if you run some race gas you can turn up the boost with no kr

Originally Posted by jnybbad

I have been fighting this KR for a long time and Im stumped. I have been through about 10 PCMs total throughout my build and I have NEVER been free of the KR. I have never heard the knock and the pugs look good. I spent about 5 hrs today looking for rattles and loose things that may be causing false knock. I currently have two tunes and I get KR in the same areas on both even though onr tune has about 5 deg less timing as the other.

The odd thing is is when I am cruising under very light engine load I will sometimes see KR up to 7 deg. Then under very heavy WOT runs I see none. Then about 5 min later its different. I will see lots of KR under WOT and none while cruising. Its all over the place. Could I have another problem??? Or do I just have overly sensitive KR sensors?

Originally Posted by 02sierraz71_5.3

I think the spuradic kr is from inconsistent fueling I would tune your maf it made an enormous difference with my tuning out kr but im na

Originally Posted by JERRY2500

I've read your thread. I may do alot of logging this weekend and work up a freash tune.