misses, knocks, and high fuel trims i need some help.

[Fattie92]

Ok well iv got a miss at idle, and every now and then at crusing speeds. I put in new taylor wires,Mitsu knock sensor, and NGK bpr7es's gapped at .028, and did a boost leak test.. That didnt seem to help, so i put in a new fuel filter as well, and it didnt help. My Low fuel trim on the logger reads 139.9%, and i got it down to 107%, but i have a +14% correction across the board. Then if i free rev it to red line, i get knock counts to 39. I changed the oil(15-50 mobil one), didnt help. I do have some lifter tick, but i dont think its causing the knock... but then you never know. Bad injectors maybe? But they all ohmed out good.

Now for the WOT stuff... I had my High fuel trim corrections set to +17% across the board, and as soon as it started to boost (15psi), the knock would jump to 39-43, and timing drops to 0. Now i have a rewired, upgraded fuel pump (255), and im also running the stock FPR. Now could the stock FPR be bad? or do i need an AFPR?.. or something else that im missing?

Im just getting tired of now being able to drive my car at its full potential. Iv tried mostly everything i can think of, but now it seems to be over my head. So Please, any info would help!

 

[Fattie92]

bump

 

[talon1979]

You can always try running some race fuel and if the knock stays that high you have phantom knock which could be caused by old/dirty lifters.

 

[talon1979]

I would also try checking your timing.

 

[Fattie92]

the timing is good..5deg at base, and 8deg with the advance at idle...


i like the race fuel idea... ill try that this weekend.

 

[Fattie92]

well i scored some BG 44k injector/fuel system cleaner (very good sh!t). We use it at work for all the warrenty services.... i might try to do a top engine clean on it as well, just to make sure i have no carbon build up on my valves that would be suckin up all of my fuel...