Here's a step-by-step guide:
Tools You'll Need:
* Socket wrench set: You'll need a socket that fits the spark plug (likely a 5/8" inch), ideally with a swivel head for easier access.
* Spark plug socket: A spark plug socket is designed to grip the spark plug without damaging it. It usually has a rubber insert.
* Ratchet: To turn the socket wrench.
* Extension: May be necessary to reach the spark plugs, especially the rear ones.
* Wrench or pliers: For disconnecting the coil pack wire connectors.
* New spark plugs: Get the correct type and heat range for your engine. Check your owner's manual or a reputable auto parts store.
* Dielectric grease (optional but recommended): To apply to the spark plug threads to prevent seizing.
* Gloves: To keep your hands clean.
* Shop rags or paper towels: For cleaning.
* Torque wrench (highly recommended): To tighten the spark plugs to the manufacturer's specified torque. Over-tightening can damage the engine block. The torque spec is usually found in your owner's manual or online repair manuals.
Procedure:
1. Locate the Spark Plugs: The spark plugs are located on top of the engine, under the coil pack. The 2.4L engine in the Cavalier has a coil-on-plug system, meaning each spark plug has its own ignition coil directly on top.
2. Disconnect the Battery: Disconnect the negative (-) battery terminal to prevent accidental shorts.
3. Access the Spark Plugs: You might need to remove the plastic engine cover for better access. Some Cavaliers may require removing the intake tube for easier access to the rear spark plugs.
4. Disconnect the Coil Packs: Each coil pack is connected to a spark plug. Carefully disconnect the electrical connector from each coil pack using your wrench or pliers. These connectors usually just push on and off, but be gentle to avoid damaging the connector or the wire.
5. Remove the Coil Packs: Once the connectors are disconnected, carefully remove the coil packs. They might be held on by clips or bolts. Note the location of each coil pack to ensure correct reinstallation.
6. Remove the Spark Plugs: Using the spark plug socket and ratchet, carefully remove each spark plug. Turn it counter-clockwise. Be careful not to drop the spark plug into the cylinder. If it is difficult to remove, use a penetrating oil like PB Blaster and let it sit for a while.
7. Clean the Spark Plug Wells: Clean any dirt or debris from the spark plug wells before installing the new plugs.
8. Install the New Spark Plugs: Apply a small amount of dielectric grease to the threads of the new spark plugs. This will help prevent corrosion and make removal easier later. Carefully screw the new spark plugs into the cylinder head by hand, until they are snug. Then, use the spark plug socket and ratchet to tighten them to the specified torque. Do not overtighten. A torque wrench is strongly recommended here.
9. Reinstall the Coil Packs: Carefully replace the coil packs in their original positions, ensuring they are securely seated.
10. Reconnect the Coil Pack Connectors: Carefully reconnect the electrical connectors to the coil packs.
11. Reconnect the Battery: Reconnect the negative (-) battery terminal.
12. Start the Engine: Start the engine and check for any misfires or unusual sounds.
Important Considerations:
* Torque Specs: Over-tightening spark plugs can damage the threads in the engine block. Use a torque wrench and consult your owner's manual or a repair manual for the proper torque specification.
* Gap: Check the gap on the new spark plugs using a feeler gauge. This should match the specifications in your owner's manual. Adjust if necessary.
* Heat Range: Ensure you're using the correct heat range spark plugs for your engine. Using the wrong heat range can lead to engine damage.
* Safety: Always work in a well-ventilated area. Be aware of hot engine components.
If you're not comfortable performing this task yourself, it's best to take your car to a qualified mechanic. This guide provides general information, and specific procedures may vary slightly depending on your vehicle's exact condition. Consult your owner's manual for the most accurate and detailed instructions.
