Tools You'll Need:
* Spark plug socket: A 5/8" (or 16mm) spark plug socket with a flexible extension is highly recommended. A swivel socket is even better.
* Wrench: To remove the spark plug wires. A small needle-nose pliers can help if the wire boots are stiff.
* Ratchet: A small ratchet will give you more leverage and control than a breaker bar.
* Spark plugs: Get the correct replacement spark plugs (check your owner's manual or a parts store for the right type).
* Gloves: Protect your hands from grease and potential dirt.
* Penetrating oil (optional): If the spark plugs are difficult to remove, applying penetrating oil a few hours before starting can help.
* Shop rag or paper towels: To clean up any spills.
* Flashlight: To illuminate the area.
Procedure:
1. Safety First: Disconnect the negative terminal from your battery. This prevents accidental short circuits.
2. Access: The rear two spark plugs on the driver's side are notoriously difficult to reach. You'll likely need to work from above and possibly slightly from the side. Consider using a mirror to see what you're doing.
3. Remove the Spark Plug Wires: Carefully pull the spark plug wires off the spark plugs. It's helpful to mark them (with tape or a marker) to ensure you put them back in the correct order, preventing misfires. Gently wiggle and pull the boots; avoid pulling on the wires themselves.
4. Access the Spark Plugs: This is the most challenging part. You'll likely need to use the flexible extension and swivel socket (if you have one). Angle the socket to get it onto the spark plug. A universal joint might also be beneficial.
5. Remove the Spark Plugs: Use your ratchet to carefully unscrew the spark plugs. Be careful not to cross-thread or drop the plugs into the engine. Work slowly and steadily. If they're stubborn, apply some penetrating oil and let it sit for a while. If possible, remove the plugs by hand after loosening with a socket.
6. Clean the Spark Plug Wells: Use compressed air or a shop rag to clean out any debris from the spark plug wells before installing new plugs.
7. Install New Spark Plugs: Carefully screw the new spark plugs in by hand until they're snug. Then use the socket and ratchet to tighten them to the manufacturer's recommended torque specification (look this up in your owner's manual or a repair manual). Do not over-tighten.
8. Reconnect the Spark Plug Wires: Carefully attach the spark plug wires back to the new spark plugs, ensuring a secure connection.
9. Reconnect the Battery: Attach the negative battery terminal back to the battery.
10. Test: Start your engine and listen for any misfires or unusual noises.
Important Considerations:
* Flexibility is Key: The key to success here is having a flexible extension and possibly a swivel socket. This will allow you to reach the plugs from different angles.
* Patience: This job is time-consuming and can be frustrating. Take your time and work carefully.
* Repair Manual: Consult a repair manual for your specific vehicle. It will likely have detailed diagrams and instructions.
* Professional Help: If you're not comfortable working on your engine, take your vehicle to a mechanic. This is a relatively small job, but the access challenges can make it difficult for the inexperienced.
This guide is for informational purposes only. Always prioritize safety and consult a repair manual or a qualified mechanic if you are unsure about any step.
