Join Date: Jun 2008
Location: Brampton, Ontario, Canada
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You've just answered your own question. If cylinder #5 injector is weak under any circumstance (ie cold engine start-ups, misfiring under load etc.), it needs to be replaced PERIOD. To diagnose properly, you would need to leave the truck overnight and have someone with a Ford IDS scan tool connected to it and the power balance graph up and running, ready to view it when the engine is started cold. Once the engine is started, the FICM compensation mode would need to be disabled to view the weak cylinder(s)/injector(s) and replaced as necessary. Once this is done, a fuel pressure check would top off the repair. By the way, replacing the fuel pressure regulator with the updated "blue spring" style would hurt either, while you're at it (part number 3C3Z-9T517-AG).
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Ford Diesel/Senior/Master Tech who placed 2nd overall in Ontario on the Fix-It-Right-First-Visit score for 2010
....who works at a dealership that now employs SOME half decent looking female employees since they overhauled most of the administrative staff
....but STILL loves hot women with big boobies
....and STILL hates working on E-Series with 6.0L