Where is the number 1 spark plug located on a 4.6L Engine for Ford Expedition 2003 Model?

The firing order for a 2003 Ford Expedition's 4.6L engine is crucial to finding #1 spark plug. The firing order itself is 1-5-4-8-6-3-7-2. However, that alone doesn't tell you the location.

To find #1, you need to look at the engine from the front (the radiator side). Cylinder #1 is typically the furthest to the passenger side (right side in a US vehicle). Then, you'll find the corresponding spark plug wire connected to the #1 spark plug in that cylinder.

Important Note: Use a repair manual or online diagrams specific to the 2003 Ford Expedition 4.6L engine for a definitive visual location. There is some minor variation depending on if its a 2 valve or 3 valve engine. Images will help clarify.