Compression Ignition Addict
Join Date: Jun 2012
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Sounds like you need a good oil change, including draining the HPOP oil. According to a few sources, the exchange between the low pressure oil system reservoir (the crankcase oil pan) and the high pressure oil pump reservoir, the flow between the two is far lower than you might think, ending up with old oil in the HPOP system, which powers the injectors. When it's cold, it has enough viscosity for good power, and when it heats up, the power goes down.
When I did my last oil change, I first changed the crankcase oil. Then I used a vacuum pump to drain the HPOP reservoir, filled it back up (about 1 quart in the reservoir, which you can't really over-fill--it drains back into the crankcase if you overfill it), then I let the engine run for a couple minutes, letting all the new oil in the reservoir enter the high pressure oil lines and into the injectors. Then I drained the HPOP reservoir again, and filled it again with new oil. The video I watched on powerstroke help dot com seemed to suggest doing this a third time, but two times was enough to get very clean oil in the reservoir after letting the engine run and the high pressure oil to circulate. I was AMAZED at how much dirtier this oil was than the crankcase oil. I think the power and response was a bit better after changing the HPOP oil.
2007 F350 King Ranch CCLB 4x4
WVO conversion in planning
RIP 1996 F250 eclb, 4x4, 7.3L PS
Viair 444C/6g air tank on frame, Hadley air horn, Hella auxiliary reverse light, DIY WVO conversion; Efuel, dual FuelLab FPR's, 90g RDS tank, aluminum tube-in-heater hose, hotfox heated fuel pickup, copper coil-wrapped filter, 40-plate FPHE, auxiliary coolant pump, 2000lb winch-crane bolted to the frame. Ranch hand front bumper. Big winch.