I’m wondering if I’m over looking the obvious here with regard to my fuel trim. Now that I’ve corrected most everything I can by changing sensors, fixing vacuum leaks, connecting grounds and switching computers I’ve been pulling my hair out and on the verge of taking a loss by dumping my Tj still trying to get my fuel trim reading where I think it should read. All,of the things I have changed for the most part needed replacing and the intake manifold being loose was also necessary to correct, I expected after taking care of the intake manifold leak everything was going to fall in place but not yet, or so I have thought. Last night I switched in all 4 of my computers expecting the fuel trim to be where it should checking my 1st wrangler fix PCM live data and the fuel trim looked perfect, the o2s up stream also looked good but the down stream voltage near the high point .7-.8 still in range. The other 3 gave high negative fuel trim data combined short term long term in total -14 to -18 out of normal range, the O2s numbers were better than the first computer I had tuned.
im now unsure if for my stroker with its oversized injectors at idle anyway I actually should expect the fuel trim to be a higher negative number? Everything I’ve done has been trying to duplicate normal fuel trims but my Jeeps not stock.
a couple issues can cause high negative fuel trim bad o2 sensors or bad injectors, a faulty PCM as well but having 4 different computers to try I think I can rule that out. The sensors seem to be operating correctly and this takes me to the injectors. Should they actually be high negative numbers since they are oversized to meet higher demands of the stroker at higher rpm situations but at idle the fuel demand is same as stock 4.0.
and if the computer I had tuned is giving normal fuel trim is that actually leading to the fuel washing bu not dialing back the fuel when not needed by the o2 sensor data?
what do you think, is the higher negative fuel trim using the oversized injector with the stroker actually what it should be?
im now unsure if for my stroker with its oversized injectors at idle anyway I actually should expect the fuel trim to be a higher negative number? Everything I’ve done has been trying to duplicate normal fuel trims but my Jeeps not stock.
a couple issues can cause high negative fuel trim bad o2 sensors or bad injectors, a faulty PCM as well but having 4 different computers to try I think I can rule that out. The sensors seem to be operating correctly and this takes me to the injectors. Should they actually be high negative numbers since they are oversized to meet higher demands of the stroker at higher rpm situations but at idle the fuel demand is same as stock 4.0.
and if the computer I had tuned is giving normal fuel trim is that actually leading to the fuel washing bu not dialing back the fuel when not needed by the o2 sensor data?
what do you think, is the higher negative fuel trim using the oversized injector with the stroker actually what it should be?