CTS RWD V6-3.6L (2008)
Spark Plug: Service and Repair
Spark Plug Replacement
Removal Procedure
1. Turn the ignition OFF.
2. Remove the ignition coil. Refer to Ignition Coil Replacement - Bank 1 (LP1, LY7) (See: Ignition System/Ignition Coil/Service and Repair) and/or
Ignition Coil Replacement - Bank 2 (LP1, LY7) (See: Ignition System/Ignition Coil/Service and Repair) .
Caution: Refer to Safety Glasses and Compressed Air Caution (See: Service Precautions/Technician Safety Information/Safety Glasses and
Compressed Air Warning) .
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.
3. Use compressed air in order to remove debris from the spark plug cavity.
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.
4. Remove the spark plug.
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
