Tools You'll Need:
* Socket set: Specifically, you'll need a deep well socket that fits your spark plugs (usually 5/8" for most Ford vehicles, but double-check your owner's manual). A ratchet and extension will also be helpful.
* Spark plug socket: A spark plug socket has a rubber insert to grip the spark plug without damaging it. This is crucial.
* Wrench: Possibly a 3/8" or 1/2" drive ratchet for tightening the coil packs.
* Torque wrench: Extremely important to avoid over-tightening the spark plugs (this can damage the threads in the engine block). Consult your owner's manual for the proper torque specification.
* Gloves: To protect your hands from grease and dirt.
* Safety glasses: To protect your eyes from flying debris.
* New spark plugs: Make sure you get the correct type and heat range for your engine. Again, check your owner's manual or consult a parts store professional.
* Penetrating oil (optional but recommended): This can help loosen stubborn spark plugs.
* Wire brush (optional): To clean the spark plug wells.
* Shop rags: To clean up any spills or messes.
Steps:
1. Safety First: Disconnect the negative terminal from your battery. This prevents accidental shorts and damage to your vehicle's electronics.
2. Locate the Spark Plugs: The spark plugs are located on top of the engine, usually under plastic coil packs. Consult your owner's manual for the exact location of each spark plug.
3. Remove the Coil Packs: For the 2002 Expedition, you will need to remove the coil packs before accessing the spark plugs. Carefully unplug the electrical connector from each coil pack and then use a wrench to carefully remove the coil pack bolts. Set the coil packs aside in a safe place. Be cautious not to drop anything into the engine bay.
4. Clean the Spark Plug Wells: Use a wire brush or compressed air to clean any debris out of the spark plug wells.
5. Remove the Old Spark Plugs: Spray penetrating oil on the spark plugs if they're difficult to remove. Using your spark plug socket and ratchet, carefully remove the old spark plugs. Turn them counter-clockwise. Be careful not to drop them into the engine.
6. Install the New Spark Plugs: Carefully screw the new spark plugs into the cylinder head by hand until they are snug. Then, use your torque wrench to tighten them to the manufacturer's specified torque (consult your owner's manual). Do not over-tighten!
7. Reinstall the Coil Packs: Carefully reinstall the coil packs, ensuring the electrical connectors are securely plugged in. Tighten the coil pack bolts to the manufacturer's specified torque.
8. Reconnect the Battery: Reconnect the negative battery terminal.
9. Start the Engine: Start the engine and listen for any unusual sounds. If everything sounds good, you've successfully replaced your spark plugs.
Important Considerations:
* If you are not comfortable performing this task, take your vehicle to a qualified mechanic. Incorrectly installed spark plugs can damage your engine.
* Gap the spark plugs if necessary. Some spark plugs require gapping, which is adjusting the distance between the electrodes. Your owner's manual will specify the correct gap.
* Always use the correct type and heat range of spark plugs. Using the wrong plugs can lead to engine damage.
This process can be challenging if you're not familiar with car maintenance. If you have any doubts, seeking professional help is always the best option. Remember to consult your owner's manual for the specifics of your vehicle.
