Engine
How to Replace Spark Plugs
Rough idle, misfires, or poor fuel economy? Fresh iridium plugs restore smooth power. Most 4-cylinder engines take under an hour.
- Time
- About 45 min
- Difficulty
- Beginner
- Last updated
- Updated
Tools you'll need
- Spark plug socket
- Ratchet with extensions
- Torque wrench
- Gap gauge
- Dielectric grease
Step-by-step
- 1
Let the engine cool completely
Never remove plugs from a hot aluminum head; the threads can strip. Wait at least an hour after driving.
- 2
Remove the ignition coils
Disconnect one coil connector, unbolt the coil, and pull it straight up. Work one cylinder at a time so nothing gets mixed up.
- 3
Remove the old plug
Blow debris out of the plug well, then unscrew the old plug with the spark plug socket.
- 4
Check gap and install the new plug
Confirm the gap matches spec. Thread the new plug in by hand to avoid cross-threading, then torque it to specification.
- 5
Reinstall the coil and repeat
Dab dielectric grease inside the coil boot, reinstall the coil and connector, and repeat for each cylinder.
Parts for this job
Engine
Iridium Spark Plugs (4-Pack)
4-cylinder gas engines
$29.99