Spark Plug Replacement: Toyota / Lexus 3.0L V6

Here's how to replace the spark plugs on a Toyota with the 3.0L V6 1MZ-FE engine. The procedure is the same for the Solara, Camry, Avalon, Lexus ES300 and similar to Toyota Sienna, Highlander and Lexus RX300. These older engines use a metal intake plenum that does not need to be removed to access the rear spark plugs, unlike the newer 3.3L and 3.5L Toyota/Lexus V6 engines. You will need a few extensions, wobbly sockets, a spark plug socket and a 3/8" ratchet to remove the plugs, especially along the rear bank. Use anti-seize on the threads to prevent them from seizing in the engine. Die-electric grease is also great for where the spark plug makes contact with the ignition coil. Some models of 1MZ-FE engines come with six coil packs, while others have 3 coil packs in front and 3 wires running to the rear spark plugs (waste spark ignition). For waste spark ignition, use dual electrode platinum plugs to prolong electrode wear, and do not gap new plugs. Changing the spark plugs is recommended at 8 years or 192,000km. It will help smoothen out a rough idle and give you slightly better fuel economy. The color of the old spark plug can tell a lot about the health of your engine.