Spark plug replacement requires a sparkplug socket that fits onto a ratchet, lined with a rubber grommet to protect the porcelain insulator of the spark plug and to hold the plug while you insert it into the spark plug hole. If you are replacing the plugs, purchase the new plugs and replace each plug one at a time. Inspect each of the new plugs for defects, and if there are any signs of cracks in the porcelain insulator of a plug, don't use it. Check the gaps of the new sparkplugs by inserting the proper thickness gauge between the electrodes at the tip of the plug. Remove the engine cover(s) and disconnect any hoses or components that would interfere with access and move the mount of the way. For 2006 and earlier 3.5L engine models, remove the intake manifold support bracket fasteners and brackets, if equipped. Remove the ignition coil/spark plug wire cover fasteners and cover from the valve covers. To access the spark plugs on the passenger's side, remove the throttle body, then pull the spark plug wires from the spark plugs, grasping the wires by the boots, not the wire itself. On models with a coil directly over the spark plugs, disconnect the coil wiring, then unbolt and remove each coil. If compressed air is available, blow any dirt or foreign material away from the spark plug area before proceeding. Remove the spark plug. Apply a small amount of anti-seize compound to the spark plug threads. It's often difficult to insert spark plugs into their holes without cross-threading them. To avoid this possibility, fit a short piece of rubber hose over the end of the spark plug. The flexible hose acts as a universal joint to help align the plug with the spark plug hole. Should the plug begin to cross-thread, the hose will slip on the spark plug, preventing thread damage. Tighten the plug to the torque. Attach the plug wires to the spark plugs, making sure that they're securely snapped in place. Reinstall the removed interfering components.
