Tools You'll Need:
* New spark plug wires: Make sure you get the correct set for your specific year and engine size.
* Socket wrench and extension: Likely a 5/8" or 7/16" socket to remove the spark plugs (double check your vehicle's specifications).
* Pliers: Needle-nose pliers can be helpful for removing old wire boots.
* Wire routing diagram (optional but highly recommended): Your vehicle's repair manual or a reliable online source will have a diagram showing the correct firing order and wire routing. This is crucial for proper engine operation. Getting the wires wrong can cause misfires or damage.
* Gloves (optional): To keep your hands clean.
Steps:
1. Disconnect the Battery: This is crucial to prevent electrical shorts and potential injury. Disconnect the negative (-) terminal first.
2. Locate the Spark Plugs and Wires: The spark plugs are located on the top of the engine, usually under a plastic cover or air intake system. You may need to remove some components to access them easily. Consult your repair manual if you're unsure.
3. Remove the Old Spark Plug Wires:
* Carefully pull off the wire boot from each spark plug. Use gentle but firm pressure. If they're stuck, gently wiggle them while pulling. Needle-nose pliers might help with stubborn boots, but be extremely cautious not to damage the spark plug itself.
* Remove the old wires from their routing clips and holders. Note their positions and routing. This information is essential for installing the new wires correctly.
4. Install the New Spark Plug Wires:
* Refer to your wiring diagram: This is absolutely essential to ensure you connect the wires to the correct spark plugs in the correct firing order. Installing them incorrectly can cause serious engine problems.
* Push the wire boot firmly onto each spark plug. Make sure the boot is seated securely. A slight snap or click should be felt indicating a good connection.
* Secure the new wires in their routing clips and holders. Follow the same routing as the old wires.
5. Reconnect the Battery: Reconnect the battery's negative (-) terminal.
6. Start the Engine: After reconnecting the battery, start the engine and listen for any misfires (rough running, sputtering, backfires). If you hear misfires, immediately turn off the engine and double-check your wiring against the diagram.
Important Considerations:
* Firing Order: The firing order is specific to your engine. Incorrect wiring will severely impact engine performance and could cause damage. This is the most critical part of the job.
* Wire Condition: While you're at it, inspect the spark plugs themselves. If they look worn or fouled, consider replacing them as well.
* Repair Manual: It's highly recommended to have a repair manual for your specific year and engine model of the S10. This will provide diagrams and detailed instructions tailored to your truck.
If you are uncomfortable performing this task, it's best to consult a qualified mechanic. Improperly installed spark plug wires can cause engine damage.
