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How long since a tune-up? Any applicable trouble codes? If temp related check the coolant temp sensor. Sometimes ford calls it a cylinder head temp sensor. I'd also use a gage and check proper fuel pressure.
It is sometimes difficult to determine exactly what is wrong with the 7.3L engines. Many times it is hit and miss for the do-it-yourselfer. It sounds like you are getting enough fuel at first and then fuel is being constricted. You might want to try changing the fuel filter. Sometimes debris becomes lodged in the fuel tank switching valve which would require cleaning the valve or replacing it.
Engine Smoking:
.
Black Engine running rich Possible Failure
-Map sensor, fuel injector or fuel pressure regulator.
Blue -Replace Faulty Transmission modulator valve
White Possible Failure. -Head gasket.
Hope this tip helps.
r/
David
check the intercooler pipes from the turbo to air intake manifold for splits or loose, normally needs someone to rev motor while some one looks and feels for excessive air blowing from this area, does mil light appear ?
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