GM 19301813
Spark Plug

Checking for engine temperature must occur first before starting the Spark Plug replacement process to protect Cylinder Head threads from damage. The Spark Plug recess area requires cleaning to prevent contamination and the specified spark plugs alone should be used on the vehicle. Switch off the vehicle ignition before starting the process. The right bank (rear) engine spark plugs need replacement but first remove the windshield wiper module cover and actuate the engine using the engine tilt strap (J41131). Start by disconnecting the throttle body air inlet duct followed by applying the park brake and shifting the transaxle into neutral position. The installation requires removal of the engine mount strut bolts to attain access for the engine mount struts swing. Fasten the engine tilt strap (J41131) before pulling the engine forward for rotation then tightening the strap. Near the end of this operation remove Spark Plug Wires together with spark plugs that exist on the engine. New and reconditioned spark plugs need gap inspection by round wire feeler gauge for compliance to specifications. Use a thread chaser to install the spark plugs which should smoothly enter the Cylinder Head until they reach full depth; thread chaser intensity depends on the results. The initial installation requires torque to 20 nm (15 lb ft) while you should torque them to 15 nm (11 lb ft) during reinstallation. Put on Spark Plug Wires then restore engine alignment before you place back the windshield wiper module cover.

Look for signs of tracking.

Use a round wire feeler gauge to gap the spark plugs to the specifications, as pre-set gaps may have changed.

Check the gap with a round feeler gauge, ensuring it is set to 0.060 in (1.52 mm).

Only the specified spark plugs for the vehicle, as using incorrect types can severely damage the engine.

It can prevent normal combustion deposits from burning off.

Install the spark plug wire(s) and, if applicable, return the engine to the proper position and reinstall the windshield wiper module cover.

Only the specified spark plugs for the vehicle, as using incorrect types can severely damage the engine.

Examine the spark plug boot for damage and inspect the spark plug recess area of the cylinder head for moisture, such as oil, coolant, or water.