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Truck surges when warming up?
Along the lines of lubricity, this has been an issue with the HEUI system on the lube oil side As well. The spool valves that control the flow of high pressure engine oil into the injector need to open and close precisely. This has been a known issue with power stroke owners(Ford licensed HEUI... -
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Truck surges when warming up?
The ECU doesn't monitor lift/baseline fuel pressure. You can do it with a cheap mechanical oil pressure gauge kit and one 1/4M-1/8F npt adapter. I have one hooked up in one of my fuel system videos on utube. I squeeze the poly line to take the pulsations out for a stable reading. I am not... -
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Truck surges when warming up?
Put a gauge on the primary fuel pressure test point. Should be 25 at idle up to 60 at RPM. If the primary pressure is stable while it’s surging, then it is probably not fuel related. Got anyone in your area with a compatible scanner. It could be the High pressure oil regulation scheme is...