Open the hood. Disconnect the high voltage wires from the spark plugs. Use a drive socket No.16. Remove the spark plugs with a spark plug wrench and place them on a work surface in the order of installing in the engine. Apply a thin layer of special grease on the thread surface of new spark plugs. Use a drive socket No.16. Screw new spark plugs and tighten them. Connect the high voltage wires to the spark plugs.