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MAINTENANCE
Spark Plugs
Spark Plug Recommendations
Refer to the specifications section beginning on page 84 for the recommended spark plug
type and gap for your vehicle. Torque spark plugs to specification after installing.
NOTICE: Using non-recommended spark plugs can result in serious engine damage. Always use the
recommended spark plugs.
Inspect and replace spark plugs at the intervals recommended in the Periodic Maintenance
Chart beginning on page 51. Inspect spark plugs when the engine is warm. Always replace
spark plugs in sets of four.
Spark Plug Service
1. Open the hood.
CAUTION! A hot exhaust system
and engine can cause burns. Allow
a hot engine to cool or wear
protective gloves when removing a
spark plug for inspection.
2. Unplug the spark plug wire
connectors from the
ignition coils.
3. Remove the ignition coil
bolts.
4. Remove the ignition coils.
CAUTION! Wear eye and face
protection when using pressurized
air.
5. Before removing the spark
plugs, use compressed air
to remove any loose dirt or
debris from the spark plug wells.
NOTICE: The spark plugs must be installed before using compressed air in this area.
6. Rinse the plug wells with water and dry with compressed air.
NOTE: Spark plug wells have drain holes built into the cylinder head to allow water to drain out.
7. Remove the spark plugs.
Tool: 5/8” spark plug socket with extension
Spark Plug Specifications
Spark Plug Type AC Delco 41-103 or equivalent
Spark Plug Torque 15 ft-lbs (20 Nm)
Spark Plug Wire Connectors (4)
Ignition
Coil Bolts (4)
Ignition Coils (4)