Tools and Materials Needed
* Spark plugs (8)
* Spark plug socket
* Ratchet
* Extension bar
* Torque wrench
* Gap gauge
* Dielectric grease
Instructions
1. Remove the engine cover.
2. Locate the spark plugs. They are located on the top of the engine. The Ford Expedition has an eight-cylinder engine, so there are eight spark plugs.
3. Disconnect the spark plug wires. Use the spark plug socket and ratchet to loosen the spark plug wires. Be careful not to pull on the wires, as this can damage them.
4. Remove the old spark plugs. Use the spark plug socket and ratchet to remove the old spark plugs.
5. Gap the new spark plugs. Use the gap gauge to measure the gap between the center electrode and the ground electrode. The gap should be between 0.045 and 0.055 inches.
6. Apply dielectric grease to the new spark plugs. This will help prevent the plugs from seizing in the engine.
7. Install the new spark plugs. Hand-tighten the new spark plugs until they are snug. Then, use the spark plug socket and ratchet to tighten the spark plugs to 18 foot-pounds.
8. Reconnect the spark plug wires.
9. Replace the engine cover.
Tips
* When removing the old spark plugs, be careful not to drop them into the engine.
* If you are having trouble removing the spark plugs, you can use a spark plug remover tool.
* Be careful not to over-tighten the spark plugs. This can damage the threads in the engine.
Changing spark plugs is a relatively simple task that can be completed in about an hour. By following these instructions, you can save money and keep your Expedition running smoothly.
