Where is th 8 spark plug on a 2003 Ford Expedition?

A 2003 Ford Expedition has a 4.6L V8 engine, which has 8 spark plugs. They are arranged in two banks of four, within the engine valley. There's no single "8th" spark plug location that's universally described as such, because the numbering can vary based on how the mechanic or diagram labels them.

To find the "8th" plug (or any plug), you need a diagram specific to the 4.6L V8 in your Expedition. You can find this in your owner's manual or a repair manual for that specific year and engine. A service manual will have clear diagrams showing spark plug locations and firing order. Online resources like repair manuals websites (often requiring a subscription) or forums dedicated to Ford Expeditions can also help.

Without a diagram, pinpointing the location is difficult and attempting to locate plugs by guesswork isn't recommended due to the risk of damaging surrounding components.