Lucerne V8-4.6L (2008)
Spark Plug: Service and Repair
Spark Plug Replacement
Removal Procedure
1. Remove the appropriate ignition coil. Refer to Ignition Coil Replacement - Bank 2 (See: Ignition Coil/Service and Repair) orIgnition Coil
Replacement - Bank 1 (See: Ignition Coil/Service and Repair).
Notice: Allow the engine to cool before removing the spark plugs. Attempting to remove the spark plugs from a hot engine may cause the plug
threads to seize, causing damage to cylinder head threads.
Notice: Clean the spark plug recess area before removing the spark plug. Failure to do so could result in engine damage because of dirt or foreign
material entering the cylinder head, or by the contamination of the cylinder head threads. The contaminated threads may prevent the proper seating
of the new plug. Use a thread chaser to clean the threads of any contamination.
2. Remove the spark plug(s) from the engine.
3. Inspect the spark plugs. Refer to Spark Plug Inspection (See: Testing and Inspection).
Installation Procedure
Notice: Use only the spark plugs specified for use in the vehicle. Do not install spark plugs that are either hotter or colder than those specified for the
vehicle. Installing spark plugs of another type can severely damage the engine.
Notice: Check the gap of all new and reconditioned spark plugs before installation. The pre-set gaps may have changed during handling. Use a round
feeler gage to ensure an accurate check. Installing the spark plugs with the wrong gap can cause poor engine performance and may even damage the
engine.
