Toyota 90919-01091 Plug, Spark

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Spark plug replacement requires a spark plug socket, torque wrench, ratchet, extension, and spark plug gap gauge. The spark plug socket should have a rubber grommet to protect the porcelain insulator and hold the plug in place. Before replacing the plugs, make sure to purchase the correct ones for your vehicle. Inspect the new plugs for any defects, such as cracks in the porcelain insulator. Check the electrode gaps using a wire gauge and adjust if necessary. To remove the old plugs, work on one at a time and remove the wire and boot by twisting and pulling. Use compressed air to clean the area around the spark plug. Unscrew the spark plug using a socket wrench with a long extension. Compare the old plugs to a chart to assess the engine's condition. Prior to installation, apply anti-seize compound to the plug threads and use a short piece of rubber hose to help align the plug and prevent cross-threading. Tighten the plug to the specified torque. Attach the plug wire to the new spark plug by twisting the boot until it is firmly seated. Repeat this process for the remaining spark plugs to avoid mixing up the wires.