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Power Strokes
6.4 Tech
RP Surge (Highway Speed)
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[QUOTE="WoodBoy, post: 245306, member: 890"] I returned my truck to stock Friday (17th) and programmed my trucks PCM back to an older strategy via Livewire that Eric sent me, I then reprogrammed my truck with my livewire to the Ex street tune. It was fairly warm Friday night since a front was coming in, then Saturday it rained all day, didnt drive much. Tonight I was headed to the gf's when I started having rail pressure surge at 53-57ish mph (1300-1400ish? Rpm, 7.5-9 PPS). The rail pressure would fluctuate anywhere from 45-62Mpa (6500-9300psi). This is the first night it has been cooler (48*F) outside. Humid conditions (85%). I just got done installing my Newton traction bars so it ruled out touchy throttle. As long as my PPS was >10, it didnt do it, or if i let out, it also quit. It DOES do it with cruise control at the same speed. Im wondering if this is cold/tune related? No DTCs. I hope I have everything covered [/QUOTE]
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