- Spark plug socket wrench
- Spark plugs x6 (NGK RE4F-11)
- Spark plug gap tool (0.044-0.052 in)
- Ratchet
- Extension(s)
- Swivel
Instructions:
1. Park the Jeep on a level surface and turn off the engine. Ensure that the engine has completely cooled down before starting the task.
2. Open the hood of the Jeep. Locate the hood release lever inside the vehicle and pull it to release the hood. Lift the hood and secure it with the support rod provided.
3. Locate the spark plugs. The 2003 Jeep Rubicon has an inline 6-cylinder engine with three spark plugs on each side of the engine block. They are located in the back of the engine bay.
4. Remove the spark plug wires. Each spark plug has a wire that connects it to the ignition coil. To remove a wire, grasp it firmly and gently pull it straight out of the spark plug. Be careful not to pull on the wire too hard as it can damage the connector.
5. Clean the spark plug wells. Before removing the spark plugs, use a compressed air hose or a brush to clean any debris or dirt from the spark plug wells. This will prevent the debris from falling into the engine when the old spark plugs are removed.
6. Use the spark plug socket wrench and ratchet to remove the spark plugs. Insert the spark plug socket wrench into the spark plug well and turn it counterclockwise until the spark plug is completely loose. Remove the spark plug and inspect its condition. If the spark plug is worn or damaged, replace it with a new spark plug.
7. Check the new spark plugs. Before installing the spark plugs, check them for the proper gap. The recommended spark plug gap for the 2003 Jeep Rubicon is 0.044-0.052 inches. Use a spark plug gap tool to adjust the gap if necessary.
8. Install the new spark plugs. Place the new spark plugs into the wells and thread them in by hand until they are finger tight. Then use the spark plug wrench to tighten the plugs to 18-25 lb-ft. Do not over tighten the spark plugs as it could damage the threads.
9. Reconnect the spark plug wires. Make sure that the wires are properly seated in the spark plugs.
10. Start the engine and check for any issues. Once the installation is complete, start the Jeep and listen for any unusual noises or changes in engine performance. If you notice any problems, stop the engine immediately and troubleshoot the issue.
Remember to always follow the recommended maintenance schedule and consult the owner's manual for more detailed instructions specific to your Jeep Rubicon model.
