Removal Procedure

Remove the ignition coils. Refer to Ignition Coil(s) Replacement - Bank 1 and Ignition Coil(s) Replacement - Bank 2 .

CAUTION: Wear safety glasses when using compressed air, as flying dirt particles may cause eye injury.

NOTE: 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.

Clean the spark plug recess area with low pressure air.
Attach the J 42068 to the 3/4 extension in order to protect the spark plug socket from getting cocked and cracking the plugs insulator. See Special Tools and Equipment .

Fig 1: View Of Spark Plugs

Courtesy of GENERAL MOTORS CORP.

NOTE: 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.

Remove the spark plugs from the cylinder heads.
Inspect the spark plugs. Refer to Spark Plug Inspection .