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Where is the fourth cylinder spark plug of a 2004 ford expedition?

The location of the spark plug for cylinder #4 on a 2004 Ford Expedition's 4.6L V8 engine is on the passenger side (right side) of the engine, towards the rear. It's usually the furthest back plug on that side.

However, it's crucial to consult a repair manual specific to your 2004 Ford Expedition. The exact location can vary slightly depending on the engine's configuration and accessories. A repair manual will have detailed diagrams and instructions to ensure you correctly identify cylinder #4 and avoid damaging anything during the spark plug replacement.