Tools You'll Need:
* Socket wrench set: You'll need a socket that fits your spark plug (usually 5/8" for many GM applications, but double-check your manual), extensions, and a ratchet. A swivel head ratchet is very helpful.
* Spark plug socket: A spark plug socket is crucial. It has a rubber insert to grip the spark plug without damaging the ceramic insulator.
* Torque wrench: This is absolutely essential to avoid damaging the threads in the cylinder head. Over-tightening is far more common than under-tightening.
* Gloves: Protect your hands from grease and grime.
* Safety glasses: Protect your eyes from debris.
* Wrench or socket for coil packs (if applicable): The 1999 Camaro likely uses coil packs. You'll need a wrench or socket to remove these before accessing the spark plugs. Some coil packs use a special retaining clip or bolt.
* New spark plugs: Buy the correct type and heat range as specified in your owner's manual.
* Penetrating oil (optional): If the spark plugs are particularly stubborn.
* Shop rags: For cleaning up.
Procedure (General Steps - Consult your owner's manual for precise details):
1. Disconnect the battery's negative terminal: This is a crucial safety precaution to prevent accidental shorts.
2. Locate the spark plugs: They're usually on top of the engine, but their exact location depends on the engine type (V6 or V8).
3. Remove the coil packs (if applicable): Carefully disconnect the electrical connectors from the coil packs and then remove the coil packs themselves using the appropriate wrench or socket. Take note of which coil pack goes where. Sometimes they are numbered or color coded.
4. Remove the spark plugs: Using the spark plug socket, carefully remove each spark plug. Spray penetrating oil on the spark plug if it's difficult to remove. Avoid dropping the spark plug into the cylinder.
5. Clean the spark plug wells: Use compressed air or a shop rag to clean any debris from the spark plug wells.
6. Install the new spark plugs: Carefully screw in the new spark plugs by hand until they are snug. Do not use tools to tighten them at this stage.
7. Tighten the spark plugs with a torque wrench: This is the most crucial step. Tighten the spark plugs to the manufacturer's specified torque. Over-tightening can strip the threads, requiring expensive repairs. Under-tightening can lead to leaks and misfires.
8. Reinstall the coil packs (if applicable): Carefully reconnect the electrical connectors and reinstall the coil packs, ensuring they are seated properly.
9. Reconnect the battery's negative terminal.
10. Start the engine: Listen for any unusual noises or misfires.
Important Considerations:
* Engine type: The procedure will vary slightly depending on whether you have a V6 or V8 engine.
* Coil packs: The method for removing and reinstalling coil packs varies by year and engine.
* Torque specifications: Incorrect torque can damage your engine. Always use a torque wrench and consult your owner's manual for the correct values.
* Gap: Spark plugs sometimes require a specific gap; check your manual or the spark plug packaging for this information. However, pre-gapped plugs are common, and you might not need to adjust.
If you are not comfortable performing this task yourself, it's best to take your Camaro to a qualified mechanic. Incorrectly installed spark plugs can cause serious engine damage.
