* 4.6L V8: This was the standard engine option, producing around 235 horsepower.
* 5.4L V8: This was an optional engine, producing around 250 horsepower.
To determine which engine is in your specific 1999 Expedition XL, you can:
* Check the vehicle identification number (VIN): The VIN can be found on the driver's side dashboard, on the driver's side door jamb, and on the title. You can use the VIN to look up the vehicle's specifications online.
* Look for engine markings: You can find the engine size and model stamped on the engine block itself, usually near the front of the engine.
* Consult the owner's manual: The owner's manual should list the engine size for your particular vehicle.
Let me know if you need further assistance!