The 2002 Ford F-150 4.2L V6 uses a coil-on-plug system, meaning each spark plug has its own ignition coil. Therefore, there isn't a traditional "firing order" in the sense of a distributor distributing the spark. Instead, the PCM (Powertrain Control Module) controls the firing of each coil individually.
While you won't find a numerical firing order like you would with a distributor, the firing sequence is determined by the engine's crankshaft position sensor and the PCM's programming. Trying to determine a specific firing sequence from the coils themselves would be unreliable and potentially damaging.
