How has it been starting since the fuel filter was repaired? Any better? Maybe some air getting into the fuel system. Also I know that the 7.3's don't start well if a few glow plugs are bad. Have you checked them? My old PS needed to be plugged in under 30 degrees until the glow plugs were replaced, then it would start unassisted down to about 0. White smoke is usually unburned fuel, which kinda leads me to the glowplugs. Does it hit on a couple of cylinders, and you still need to crank until it picks up the rest? Will is start fine if the truck is warm?
White smoke when the engine is cold, is unburnt fuel due to the lack of heat in the cylinder. Thats why your engine has glow plugs, to heat the cylinder up, and help ignite the fuel on startup, and until the engine can support itself. Black smoke is unburnt fuel due to lack of necessary air.
Defuel is what happens when the governor weights overcome the spring and they balance, it cuts the fuel back to keep the engine from overreving.
I'm not much of a Ford guy, what's the FPR spring? Fuel Pressure Regulating? Where does it go?
Michael
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