After chasing many things I think we finally found my issue. I'll start from the beginning and see what you guys think.
Initially I was plagued with a FPR issue P0089. It would spike rail pressure at idle and cause loping / surging. That issue seems to have disappeared after I messed with the wiring hoping it was a bare wire / grounding issue. Truck ran fine for a few weeks. Drove to Tennessee and it felt like the converter was slipping. It would smoke badly and rev, but would not downshift and go. Fast forward, I bought and installed Ben's lockup switch hoping it was the tcm or converter somehow. Thought the switch worked and it does, however I am still plagued by the same issue. Today I put the truck in tow/haul & auto on the switch...it got to 3rd and I punched it. Truck revved, smoked, and wouldn't shift. Spoke with Evan @ Limitless and he suggested it could be the FPR. Got home and did a short data-log and desired rail pressure was around 22000, but actual rail pressure was about 12000.
Could I have gotten a bad FPR initially and it been masked by tuning? Or indeed be a wire / ground issue?
It IS a new pump ~6 months old / 3000-4000 miles on it. Modified lbz from Fleece. Any thoughts / opinions / ideas?
Initially I was plagued with a FPR issue P0089. It would spike rail pressure at idle and cause loping / surging. That issue seems to have disappeared after I messed with the wiring hoping it was a bare wire / grounding issue. Truck ran fine for a few weeks. Drove to Tennessee and it felt like the converter was slipping. It would smoke badly and rev, but would not downshift and go. Fast forward, I bought and installed Ben's lockup switch hoping it was the tcm or converter somehow. Thought the switch worked and it does, however I am still plagued by the same issue. Today I put the truck in tow/haul & auto on the switch...it got to 3rd and I punched it. Truck revved, smoked, and wouldn't shift. Spoke with Evan @ Limitless and he suggested it could be the FPR. Got home and did a short data-log and desired rail pressure was around 22000, but actual rail pressure was about 12000.
Could I have gotten a bad FPR initially and it been masked by tuning? Or indeed be a wire / ground issue?
It IS a new pump ~6 months old / 3000-4000 miles on it. Modified lbz from Fleece. Any thoughts / opinions / ideas?