1. Gather Tools and Materials:
- New spark plugs (check the owner’s manual for the recommended type)
- Spark plug wrench
- Socket wrench set
- Gapping tool (if necessary)
- Dielectric grease
- Shop towels or rags
2. Safety First:
- Ensure the engine is completely cool to the touch.
- Disconnect the negative battery terminal to prevent any electrical accidents.
3. Remove the Engine Cover:
- Locate the engine cover on top of the engine.
- Refer to your owner's manual for specific instructions on removing the engine cover for your Expedition model.
4. Locate the Spark Plugs:
- The spark plugs are located on the top of the engine.
- Refer to the owner's manual for the specific locations of the spark plugs on your Expedition model.
5. Remove the Spark Plug Wires:
- Carefully remove the spark plug wires from the spark plugs one by one.
- Be cautious not to damage or pull on the wires excessively.
- Label or make a note of the order in which the wires were connected to the spark plugs for easy reinstallation later.
6. Remove the Old Spark Plugs:
- Use the spark plug wrench to loosen and remove the old spark plugs.
- Be careful not to drop the removed spark plugs into any openings in the engine.
7. Check and Adjust the New Spark Plugs:
- Compare the new spark plugs to the old ones to ensure they are the correct type and size.
- If necessary, use the gapping tool to adjust the spark gap to the recommended specification (refer to the owner’s manual).
8. Apply Dielectric Grease:
- Apply a small amount of dielectric grease to the threads of the new spark plugs to prevent corrosion and ensure a proper connection.
9. Install the New Spark Plugs:
- Carefully screw in the new spark plugs by hand until they are snug.
- Use the spark plug wrench to tighten the spark plugs until they are snug, but do not over-tighten.
10. Reattach the Spark Plug Wires:
- Reattach the spark plug wires to the corresponding spark plugs, ensuring they are properly seated and secure.
- Double-check that the wires are connected in the correct order as noted earlier.
11. Replace the Engine Cover:
- Reinstall the engine cover following the steps outlined in the owner’s manual.
12. Reconnect the Battery Terminal:
- Reconnect the negative battery terminal to restore electrical power to the vehicle.
13. Start the Engine:
- Start the vehicle and let it run for a few minutes to ensure proper operation.
- Listen for any unusual engine sounds or vibrations.
Remember, if you are not comfortable performing this task, it's best to have it done by a professional mechanic to ensure proper installation and avoid any potential issues.
