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Fuel Injector

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According to Elite Diesel, early 6.0L injectors often experienced stuck or sticking spool valves, although it can occur on any model year engine. Depending on which position the spool valve gets stuck in, too much oil can be allowed to flow in from the high-pressure oil rail (stuck open), or not enough oil can flow in to activate the injector (stuck closed). Midway through the 6.0L’s five-year production run, Ford phased in an FICM re-flash called “Inductive Heating Flash” that fixed sticking spool valves in the injectors.