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Worn spark plugs cause misfires, poor fuel economy, and hard starting. New plugs restore ignition efficiency and smooth engine operation.
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Step-by-step video walkthrough for this procedure
You'll need a spark plug socket (5/8" or 13/16" depending on plug type), ratchet, extension, torque wrench, and anti-seize compound. Work on a completely cold engine.
Disconnect the electrical connector from the ignition coil. Remove the coil bolt and pull the coil straight up out of the well. On older vehicles, twist and pull the spark plug wire boot.
Use the spark plug socket with an extension to unscrew the plug. If it's very tight, apply penetrating oil and wait 10 minutes. Turn slowly to avoid breaking the plug in the head.
Check the gap on the new plug with a gap tool — match the spec on the underhood sticker. Apply a tiny amount of anti-seize to the threads. Thread in by hand first, then torque to spec (typically 12–18 ft-lbs).
Push the ignition coil back into the well, reinstall the bolt, and reconnect the connector. Repeat for all cylinders. Start the engine and listen for smooth idle.