Identify failing spark plugs and replace them correctly to restore smooth acceleration and fuel economy.
Match plug type and heat range to the engine spec using fitment and OE cross references.
If your engine uses iridium OE plugs, replace with equivalent quality.
Disconnect battery negative terminal, remove engine cover, and unplug coil connectors carefully.
Label connectors if coil positions are close together.
Work on a cool engine to avoid thread damage and burns.
Remove coils, then loosen plugs using a spark plug socket and extension.
Blow out debris around the plug wells before removal.
Do not force seized plugs; use proper penetration and back-and-forth technique.
Verify plug gap if applicable, thread by hand first, then torque to manufacturer spec.
Use a torque wrench to prevent under/over-tightening.
Never cross-thread aluminum heads.
Reinstall coils/connectors, reconnect battery, clear misfire codes if present, and road-test.
Replace ignition coils or boots if misfire persists under load.
Install a complete matched set by OE spec.
Replace worn boots/coils if cracking or repeat misfire is present.
Use only when specified by plug manufacturer guidance.
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