1. Preparation is Key:
* Consult a Repair Manual: A Haynes or Chilton manual (or a digital equivalent) specific to your 2000 Avalon is invaluable. It will show you the exact plug locations, torque specifications, and potentially offer tips for easier access.
* Gather Tools: You'll need:
* Spark plug socket: The correct size and ideally a deep well socket to reach the plugs. A swivel socket extension will be extremely helpful.
* Spark plug wrench: A ratchet with extensions, preferably flexible ones.
* Penetrating oil (like PB Blaster): Spray this generously on the plugs several hours (or even overnight) before you start to loosen them. This will help break free any corrosion or seizing.
* Gloves: Protect your hands.
* Shop rag or paper towels: To clean up any spilled oil or debris.
* Jack and jack stands (optional but highly recommended): This will provide better access and make the job safer. Remember to secure the car properly.
2. Accessing the Plugs:
The challenge is accessing that one particularly stubborn plug. Here's the likely solution, incorporating the limitations you've mentioned:
* From the Top (Most Likely): You'll primarily work from the top, through the engine bay. Even with the plastic removed, the firewall likely restricts a straight pull.
* Use Extensions and Angles: This is where the swivel socket extension becomes crucial. Experiment with different combinations of extensions and angles to find the optimal approach. You might need to carefully maneuver the socket around other components in the engine bay.
* Work from Different Angles: Try reaching the plug from slightly different angles – perhaps by working your hand and tools further toward the front of the engine compartment.
* Mirror and Flashlight: A small mirror and a flashlight will assist in visualizing the spark plug and its surrounding area, allowing you to precisely guide your socket.
3. Removing and Replacing the Plugs:
* Loosen Carefully: Once you've positioned your socket, carefully start to loosen the plugs. Avoid applying excessive force. If they're seized, try applying more penetrating oil and waiting a bit longer.
* Remove and Install: Once loose, carefully unscrew and remove the plugs. Inspect the old plugs for wear and tear. Install the new plugs, hand-tightening them first, then using the wrench to tighten them to the manufacturer's specified torque (find this in your repair manual). Do not overtighten!
* Clean Up: Clean up any debris or spilled oil.
4. If Still Stuck:
* Professional Help: If you've exhausted all options and are still unable to remove the plugs, it's best to seek professional help from a mechanic. They have experience with these tricky situations and specialized tools that might make the job easier.
Important Safety Note: Always disconnect the negative terminal of your car's battery before working on any electrical components, including spark plugs. This is a crucial safety measure to prevent accidental shocks or short circuits. Also, be mindful of hot engine components – allow the engine to cool down completely before starting any work.
