would not having enough fuel pressure at wot cause KR? actually, would it cause knock? i ordered an inline fuel pump, but, just so i know. thanks

 

What are your 02 sensor reading's at WOT?

 

ok, wot, kr=8, o2 946 and 942, inj b1 and b2 21.1. during the run, my o2 dropped to 880ish, kr dropped to 5ish, then back up. ltft were 0 during the whole wot run

 

probably too much advance timing or the wrong octane fuel would be my guesses. your o2's aren't that high. low 900's is good. the long terms at zero is great. i am sure some tuning experts will chime in to help out as well.

 

Did it just start doing this all of the sudden? I would give Allen a call and tell him what's going on. He just recently did a retune for me because I was seeing all kinds of KR. Allen adjusted a few things with the timing and what not and now I have no KR and my truck is alot stronger. Do you know what your IAT's are?

 

i was only commanding like 12deg. it dropped below 5. i'm thinking it's got to be my harmonic balancer/crank pully rattling, or a fuelling issue. christ, it's not like i'm asking for 22deg. I'm lost. the other thing is, could my alcohol injection be causing the problem???? i know it messes with a/f.

 

I am not a tuning expert by any means but I was having the same problem about a month ago. My timing was dropping down to like 6-8 degrees at WOT and my truck felt like a dog. I am not sure all what Allen adjusted on mine but I know he desensitized my knock sensors some and I'm not having any problems now. My timing now is about 15-16 degrees at WOT but I am also not running an intercooler either. How are your intake air temps?

 

actually, what am i thinking? i should just email it to allen.. duh!! i paid for the damn tune. LOL. i'll do that. good call. i always forget about that since i have hptuners.

 

Yes, not enough fuel pressure could cause knock. So you don't have an inline fuel pump right now?

How high are you revving it? At 21 ms you are out of injector at 5700rpm.

 

i was only at 3600rpm when i saw 8deg. but, i'm revving to 6000rpm. Should have the inline pump in a few days. I'm trying to email my tune/log to allen but my mail server is down.