Tools You'll Need:
* Socket Set: You'll need a socket that fits your spark plugs (likely 5/8" or 13/16", check your manual). A deep socket is highly recommended.
* Spark Plug Socket with Rubber Boot: This prevents damaging the spark plug porcelain.
* Wrench: For the coil pack bolts (usually 7/16" or 1/2").
* Ratchet: To turn the socket.
* Extension(s): To reach the rear plugs.
* Gloves: To protect your hands.
* New Spark Plugs: Use the correct type and heat range specified in your owner's manual. Don't guess!
* Dielectric Grease (optional but recommended): Apply a small amount to the threads of the new spark plugs to aid installation and prevent corrosion.
* Shop Rags or Paper Towels: To clean up any spills.
* Repair Manual: Absolutely crucial for torque specs and specific steps.
General Steps (Consult your repair manual for precise details):
1. Safety First: Disconnect the negative battery cable.
2. Access: You'll likely need to remove some components for better access to the spark plugs, this may include:
* Air intake system: To access the front plugs.
* Coil packs: The coil packs sit on top of the spark plugs and need to be removed. They are usually held down by bolts. Be careful not to drop the coil packs. Note the position of each coil pack before removal, to avoid re-installing them incorrectly.
3. Remove the spark plugs: Carefully remove each spark plug using the spark plug socket and ratchet. Avoid dropping them.
4. Inspect the old spark plugs: Examine the old plugs for wear, fouling, or damage. This can help diagnose potential engine problems.
5. Clean the spark plug wells: Use compressed air to remove any debris from the spark plug wells.
6. Install new spark plugs: Apply a small amount of dielectric grease to the threads of the new spark plugs (only on the threads). Carefully screw them in by hand until they are snug. Then use the spark plug socket and ratchet to tighten them to the manufacturer's specified torque. Do not over-tighten.
7. Reinstall the coil packs: Reinstall the coil packs in their original positions, securing them with the bolts.
8. Reinstall removed components: Reassemble the air intake system and any other components you removed.
9. Reconnect the battery cable.
10. Start the engine: Check for any issues and listen for any unusual sounds.
Important Considerations:
* Torque Specifications: This is extremely important. Over-tightening can damage the spark plugs and the engine. Under-tightening can cause misfires. Your repair manual will provide the correct torque specs.
* Gap: Spark plugs often need to have a specific gap. If you have to gap them yourself, use a spark plug gapping tool.
* Coil Pack Order: Make sure you put the coil packs back in the correct order.
This is a general overview. It is strongly recommended to consult a repair manual specific to your 1999 Camaro Z28 before attempting this repair. If you're not comfortable performing this repair yourself, take your car to a qualified mechanic. Improperly installed spark plugs can lead to significant engine damage.
