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Power Strokes
6.4 Aftermarket
Ford 6.4 drive-ability
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[QUOTE="pdaddyvr6, post: 1495572, member: 10351"] I just went thru something that sounds very similar. Changed the hpfp in my truck because it would not hold pressure on a big tune. Other than that it ran fine. First drive after changining it rail pressure would get to 10-11k on easy accel and then totally stumble and fall to less than 1k. Give it more throttle and it would recover and make desired pressure no problem. F$$cked with it for a day or two , tried many things, reset adaptives, checked wiring, no air, etc. Tried resetting electrics by draining capacitors, nothing changed. Finally after some in depth data logging with ids, realized the ecm was not controlling the pump properly. Before I ordered a ecm, I figured what the hell and I pumped a totally stock tune in and took it for a drive. Ran perfectly, other than slow and lights on in the dash...........Retuned it and it ran perfectly and hasn't missed a beat. I can't explain it but whatever. Any who, worth s shot if you have not tried it. [/QUOTE]
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