How do I change out the spark plugs?

To change the spark plugs in your 2002 Cadillac Deville, you can follow these steps:

Gather the necessary tools and materials: You will need a spark plug socket (usually 5/8" or 13/16"), a ratchet or spark plug wrench, a spark plug gap tool, and new spark plugs. Ensure you have the correct spark plug type and gap specification for your specific vehicle model.

Locate the spark plugs: The spark plugs are located on the top of the engine, accessible from the top of the engine bay. You will see a series of wires or ignition coil packs leading to each spark plug.

Disconnect the spark plug wires or ignition coil packs: If your vehicle has spark plug wires, carefully pull them off the spark plugs one at a time. If it has individual ignition coil packs, remove the retaining bolts or connectors and gently pull out the coils.

Remove the old spark plugs: Attach the spark plug socket to your ratchet or spark plug wrench. Insert the socket onto the spark plug and turn counterclockwise to loosen and remove the old spark plug from the cylinder head. Repeat this process for all the spark plugs.

Inspect the new spark plugs: Before installing the new spark plugs, check their gap using a spark plug gap tool. Adjust the gap if necessary to match the specifications in your vehicle's manual.

Install the new spark plugs: Insert the new spark plug into the spark plug socket. Carefully thread the spark plug into the cylinder head by hand to avoid cross-threading. Once finger-tight, use the spark plug socket and ratchet or wrench to snugly tighten the spark plug. Be careful not to overtighten.

Reconnect the spark plug wires or ignition coil packs: If you removed spark plug wires, push them firmly onto the new spark plugs. If you removed ignition coil packs, reinsert them into the corresponding cylinder and secure them with the retaining bolts or connectors.

Repeat for all spark plugs: Repeat steps 4 to 7 for each remaining spark plug.

Reassemble and test: Once all the spark plugs are replaced, reassemble any components you may have removed and ensure they are properly secured. Start the engine and listen for any abnormal noises or misfires.

It's important to consult your vehicle's manual for any specific instructions or torque specifications regarding the spark plug replacement. Additionally, if you are unsure or uncomfortable performing this task yourself, it's recommended to seek the assistance of a qualified mechanic.