Ford CYFS-12F-5 Spark Plug

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First of all, to replace spark plugs, a qualified technician should use special tools. These include extensions, gap gauge, spark plug socket and torque wrench. Purchase plugs ahead of time and adjust gaps replacing them one by one. Ensure that the engine has cooled before removing it. Make sure you check new plugs for defects and adjust gaps on them. Use compressed air to blow out debris and apply anti-seize compound on threads. Forbid cross-threading with a rubber hose.

To check the gap, insert the proper-thickness gauge between the electrodes at the tip of the plug. If the gap is incorrect, use the adjuster on the gauge body to bend the curved side electrode slightly until the proper gap is obtained.

Access to the rear cylinder bank spark plugs on V6 models requires removal of the upper intake manifold.

Before removing the ignition coils to access the spark plugs, use compressed air to blow any dirt or foreign material away from the spark plug hole.

In V8 and OHC V6 engines, individual ignition coils may need to be removed before accessing the spark plugs. Care should be taken when removing spark plug wires.