How to replace spark plugs in an engine on Cadillac STS?

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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.

OEM Cadillac STS Spark Plug

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Cadillac STS Spark Plug

Cadillac STS Spark Plug

Cadillac STS Spark Plug

Cadillac STS Spark Plug

Cadillac STS Spark Plug

Cadillac STS Spark Plug

Cadillac STS Spark Plug

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