Tools You'll Need:
* Socket wrench and extension: A 5/8" spark plug socket is usually the correct size, but double-check your owner's manual. A swivel socket extension will be invaluable.
* Spark plug gap tool: To check the gap of the new plugs (if needed).
* New spark plugs: Make sure you get the correct type and heat range for your engine. Consult your owner's manual or a parts store for the correct specification.
* Penetrating oil (like PB Blaster): This can help loosen the spark plugs if they're stuck.
* Rags or shop towels: To clean up any oil or debris.
* Gloves: To protect your hands.
* Possibly a small pry bar or flathead screwdriver: Might be needed to help carefully pry back the metal covers.
Procedure:
1. Disconnect the negative battery cable: This is crucial for safety to prevent accidental shorts.
2. Locate the spark plug wires: These are connected to the spark plug boots, which are under the metal covers.
3. Remove the metal covers: This is the trickiest part. The covers are usually held in place by clips or tabs. You may need to carefully pry them back *slightly* using a small pry bar or flathead screwdriver. Be extremely gentle to avoid breaking the clips or damaging the metal covers themselves. The goal is to create enough space to work with the boots, not remove the covers entirely. Some wiggle room is all you need.
4. Disconnect the spark plug wires: Carefully pull off the spark plug wires one at a time. It's helpful to mark each wire's location before removal to ensure correct reinstallation. A small piece of tape or a marker on the wire and intake manifold will help.
5. Remove the spark plugs: Use your socket wrench and extension to carefully remove each spark plug. Apply penetrating oil to the plug if it's difficult to remove; allow it to sit for a while before trying again. Avoid cross-threading.
6. Check the gap (if necessary): Use a spark plug gap tool to ensure the gap on your new spark plugs matches the manufacturer's specifications.
7. Install the new spark plugs: Screw the new spark plugs in by hand until they are snug. Then use your socket wrench to tighten them to the manufacturer's recommended torque. Don't overtighten; you can easily strip the threads.
8. Reconnect the spark plug wires: Carefully connect each wire to its corresponding spark plug boot, ensuring a secure connection.
9. Reinstall the metal covers: Gently push the metal covers back into place. Make sure they are securely fastened.
10. Reconnect the negative battery cable:
11. Start the engine: Check for any misfires or unusual noises.
Important Considerations:
* Torque Specification: Find the correct torque specification for your spark plugs in your owner's manual. Over-tightening can damage the spark plug threads or the cylinder head.
* Anti-seize: Applying a small amount of anti-seize compound to the threads of the new spark plugs can make removal easier in the future.
* Professional Help: If you're uncomfortable performing this task, it's always best to take your Durango to a qualified mechanic. Damaged spark plugs or incorrect installation can lead to engine damage.
Remember to always prioritize safety when working on your vehicle. If you're unsure about any step, consult a repair manual or seek professional assistance.
