To find cylinder #1 for *your* 5.4L Ford Expedition engine, you need to:
1. Locate your engine's casting number: This is usually found on a flat surface of the engine block itself. It's a series of numbers and letters.
2. Use a repair manual or online resource: Once you have the casting number, you can use a repair manual specific to your vehicle's year and engine code (found in the owner's manual) or an online database like Ford's own parts site or a reputable automotive repair website. Search using the engine casting number and "cylinder 1 location" or "firing order."
3. Look for casting marks: Some engine blocks have the cylinder numbers cast directly onto the block, though these are not always easy to find.
Without the year and engine code (or casting number), I cannot tell you the exact location of cylinder #1.
