GM 19300872
Spark Plug

The process starts by removing the engine sight shield then moving to the front section of supercharger inlet duct assembly before removing the ignition coils in a complete assembly. Low-pressure air should be used to clean the Spark Plug recess area but safety glasses are vital protection against flying dirt particles. A thread chaser must clean all threads after thorough recess area cleaning because foreign elements may cause plug seating failure. The cooling process after engine shutdown should begin before removing spark plugs because thread seizing could potentially harm the Cylinder Head. Observation of spark plugs needs to be conducted at regular intervals. The vehicle requires specified spark plugs and requiring verification of the new plugs' gap measurement against specifications because improper plug choice between hotter or colder options risks catastrophic engine damage. Test the gap of all new along with reconditioned spark plugs using a round feeler gauge since handling can modify initial gaps. Put the spark plugs into the cylinder heads while making sure threads mate easily and plugs reach their full length; an optional thread chaser can help if tube cleaning is required. Apply 20 n.m (15 lb ft) torque when installing spark plugs to prevent overheating as well as exhaust blow-by or thread damage. The last step involves putting back the Ignition Coil assemblies and the front supercharger inlet duct sections along with the engine sight shield.

Engine replacement of spark plugs requires an initial wait for engine cooling until threads on the Cylinder Head are safe. The Spark Plug recess area requires cleaning to stop dirt from entering the Cylinder Head because such contamination blocks proper seating of new spark plugs. It is essential to use only the spark plugs which are originally designated for the vehicle model since alternative temperature levels of plugs will seriously destroy the engine system. Detach the Spark Plug Wires before removing spark plugs from their installation position within the Cylinder Head. A round wire feeler gauge should be used to verify the gap of new and reconditioned spark plugs before installation because their pre-set gaps might have altered. Proceed with gapping new spark plugs by referring to the ignition system specifications. The plug needs to slide smoothly through the Cylinder Head while reaching full insertion depth by using a thread chaser on soiled threads. Pay close attention to the torque specifications because improper tightening may result in overheating as well as exhaust blow-by and thread damage. Beginner installments of spark plugs into new cylinder heads should reach 20 n.m (15 lb ft) torque but subsequent installations need only reach 15 n.m (11 lb ft). The final installation step involves placing the spark plugs inside the Cylinder Head after tightening them to 15 n.m (11 lb ft) and completing wire reconnection.

Only the specified spark plugs for the vehicle should be used, as using plugs that are hotter or colder can severely damage the engine.

Use compressed air to remove debris and allow the engine to cool before proceeding.

Remove the spark plugs from the cylinder head.

Ensure the spark plug threads smoothly into the cylinder head and is fully seated, using a thread chaser if necessary to avoid cross-threading or incomplete seating.

Use compressed air to remove debris from the spark plug cavity.

Tighten it to 20 N.m (15 lb ft).

Only the specified spark plugs should be used, avoiding those that are hotter or colder.

Only the specified spark plugs should be used, as installing plugs that are hotter or colder can severely damage the engine.

First, remove the ignition control modules and clean the spark plug recess area with low pressure air, ensuring to wear safety glasses.

Ensure that only the specified spark plugs for the vehicle are used, as installing plugs that are hotter or colder can severely damage the engine.

Only the specified spark plugs for the vehicle, as using plugs that are hotter or colder can severely damage the engine.

The spark plug gap should be set to 1.0 mm (0.040 in).

First, remove the ignition coil(s) and ensure that any water and debris are blown out of the spark plug holes before proceeding.