Tools You'll Need:
* Socket Set: Specifically, a deep well socket that fits your spark plugs (usually 5/8" or 13/16"). A flexible ratchet will be very helpful.
* Spark Plug Wrench: A spark plug socket is a deep well socket with a rubber insert to grip the spark plug and prevent damage. This is crucial.
* Extension: A socket extension will give you better leverage and reach.
* Torque Wrench: This is absolutely essential to prevent over-tightening or under-tightening the new plugs. The torque spec is usually printed on the new spark plug packaging; it's critical to follow this.
* Gloves: To keep your hands clean.
* Penetrating Oil (like PB Blaster): To help loosen stubborn spark plugs. Apply this several hours or even overnight before attempting removal.
* Rags or Shop Towels: To clean up any spills or debris.
* New Spark Plugs: Make sure you purchase the correct type and heat range for your engine. Your owner's manual or a parts store can help with this.
Steps to Change Spark Plugs:
1. Safety First: Disconnect the negative battery cable to prevent accidental electrical shorts.
2. Access the Engine: You'll likely need to remove the engine cover (if equipped) and possibly other components to gain clear access to the spark plugs. Consult a repair manual specific to your year and engine size for detailed instructions on this. This often involves removing air intake components.
3. Locate the Spark Plugs: Once you have good visibility, identify the spark plug wires. Each wire connects to a spark plug. Note carefully which wire goes to which plug. Use a camera or draw a diagram if necessary; mis-wiring can cause engine damage.
4. Remove Spark Plug Wires: Gently pull each wire straight off its spark plug. Sometimes a slight twist helps.
5. Apply Penetrating Oil (if needed): Spray penetrating oil onto the spark plugs to help loosen them, especially if they're difficult to remove. Let it sit for at least 15-30 minutes.
6. Remove the Spark Plugs: Using your spark plug socket and extension, carefully remove each spark plug. Avoid dropping the socket inside the cylinder. Go slow and steady; if you meet resistance, stop and reapply penetrating oil.
7. Clean the Spark Plug Wells: Use compressed air or a shop vac to carefully remove any debris from the spark plug wells.
8. Install New Spark Plugs: Carefully screw in the new spark plugs by hand until they're snug. Then, using your torque wrench, tighten them to the manufacturer's specified torque setting. Do not over-tighten.
9. Reconnect Spark Plug Wires: Reattach the spark plug wires, ensuring each wire is securely connected to its correct spark plug.
10. Reassemble Everything: Reinstall any components you removed to access the spark plugs.
11. Reconnect the Battery Cable: Reconnect the negative battery cable.
12. Start the Engine: Start the engine and listen for any unusual noises or misfires. Let it run for a few minutes to warm up.
Important Considerations:
* Repair Manual: A repair manual specific to your 2000 Ford Expedition is highly recommended. It will provide detailed diagrams and instructions.
* Professional Help: If you're not comfortable performing this task yourself, take your vehicle to a qualified mechanic. Improperly installed spark plugs can cause significant engine damage.
* Engine Type: The specific location and access to the plugs will vary slightly depending on whether you have the 4.6L or 5.4L V8.
This is a general guide. Always consult a repair manual for detailed instructions specific to your vehicle's engine and model. Improperly changing spark plugs can damage your engine.
