CTS V6-3.2L VIN N (2003)
NOTE:
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Be sure that the spark plug threads smoothly into the cylinder head and the spark plug is fully seated. Use a thread chaser, if necessary, to clean
threads in the cylinder head. Cross-threading or failing to fully seat the spark plug can cause overheating of the plug, exhaust blow-by, or thread
damage.
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Refer to Component Fastener Tightening Notice in Service Precautions.
Tighten
Tighten the spark plugs to 25 N.m (18 lb ft).
3. Install the ignition coils.
