Join Date: Apr 2007
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First, thank you for your service.
Now on to the truck stuff. Worn injectors can not fire properly when cold, but begin to work correctly when warm. Eventually this can lead to a no start as the weather cools. Plugging the truck in will minimize the missing, or can allow it to start, but still miss.
Unfortunately worn or sticking injector internals will not throw an engine code that points to the problem. A scanner capable of reading live data might catch the problem, but you might have to fool the PCM into thinking the engine is warmed up to get the info you need.
Any way to find out where the 2 "new" injectors came from? If he got them at some cheap rebuilder like Pensacola diesel, it could be the "new" injectors that are the problem. If your dad is willing and able to pull the valve covers, have him watch the oil discharge from each injector when cold. If you've got one or more injectors not spitting oil, that means they are not firing. If they start spitting oil when the engine warms up, that would indicate worn injectors.
A buzz test will also offer clues to worn injector internals, but you'll need a scanner like AE or others that can perform those tests or monitor live data.
2002 F350 6-speed 444 CID. XLT, Heated Seat, 500,000 & counting.
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