Start by switching off the Ignition Switch and then remove the fuel injector sight shield. The Spark Plug heat shield removal tool (J 38491) serves to softly lift the heat shield away from the spark plugs. Start by unscrewing the Spark Plug wires beginning with positions 2,4,6 from the engine's rear section. Take note of wire placement before disassembly. Start by twisting Spark Plug boots 1/2 turn counterclockwise and follow with wire removal from spark plugs. Move to the Spark Plug wires (1,3,5) at the front of the engine and record their positions before carefully twisting the boot fits. Starting with the ignition coils, disconnect the Spark Plug wires followed by removing retaining clips from the engine's rear, front and top. When installing new Spark Plug wires all boot heat shields along with Spark Plug wire conduit and retaining clips need to be transferred from the old wires for proper future installation. Begin by positioning new Spark Plug wires on the engine and adding retaining clips before correctly connecting wires to Ignition Coil and spark plugs starting with (1,3,5) at the front followed by (2,4,6) at the rear positions. Install the fuel injector sight shield after installation completes.