This is consistent across most years of production for the 5.4L V8 engine, from 1997 to 2010. It's important to note that there might be slight variations for specific model years or configurations. To be absolutely sure, you can:
* Consult your owner's manual: This is the most reliable source for your specific vehicle.
* Check the engine block: The firing order is often stamped on the engine block near the front.
* Look it up online: Search for your specific year and model E-250 on a reputable automotive website.
