1. Open the hood of your vehicle and locate the engine bay.
2. Identify the cylinder banks. The engine will either be an Inline-6 (engine cylinders arranged in a straight line) or a V6 (engine cylinders arranged in two banks of 3).
3. Locate the cylinder head. The cylinder head is the metal cover located at the top of the engine block.
4. Look for the cylinder number markings. The cylinder numbers will be stamped or cast onto the cylinder head or valve cover near the spark plugs.
5. Locate the coil packs. The coil packs are responsible for providing the spark to the spark plugs.
6. Refer to your vehicle's service manual or repair information to match the cylinder number with the corresponding coil pack.
7. The coil packs for cylinders 3 and 4 should be located in the middle of the engine near the firewall.
By following these steps, you should be able to identify which engine cylinders are numbered 3 and 4 on your 2000 Toyota Avalon and easily replace the coil packs if needed.
