Is your Mitsubishi idling rough, and the check engine light is on due to a faulty spark plug or ignition coil? Learn how to fix the problem by replacing your Mitsubishi’s spark plug and ignition coil. This article provides instructions on replacing the spark plugs and ignition coils on Mitsubishi’s four-cylinder engines found on Outlander, Lancer, Galant, Eclipse, and other models.
What you will need
- Mitsubishi Spark Plugs
- OEM Plugs are NGK
- 2.0L – DIFR6C11
- 2.4L – DIFR5C11
- OEM Plugs are NGK
- Mitsubishi Ignition Coils (Optional)
- 5/8 Spark Plug Socket
- Ratchet wrench
- 6″ Ratchet extension
- Torque Wrench
- Park the car on level ground. Turn off the ignition and set the parking brakes. Allow the engine to cool down.
- Open the hood by pulling the hood release under the dashboard.
- Remove the engine cover. It is held in place with three 10mm bolts.
- Unplug the electrical connector from the ignition coils. Repeat for all four coils.
- Remove the 10mm bolts that hold down the ignition coils.
- Use a spark plug socket to remove the spark plugs. Turn the ratchet counterclockwise to remove spark plugs.
- Install the new spark plugs. Your new spark plugs should come pre-gapped, but it is recommended to check the gap. It should be between 0.028 and 0.038.
- Tighten the spark plug to approximately 15 lb. ft.
- Reinstall the ignition coil and engine cover.
- 15 -20 ft-lb
Spark Plug Change Interval
- Copper: Every 30,000 to 50,000 miles
- Iridium: Every 90,000 miles
Check Engine Light Still On
If the check engine light is still on after you have replaced the spark plugs and ignition coils, use the YOUCANIC Full System Scanner to clear the codes. This scanner can also read and clear fault codes through every vehicle’s control module.
We hope you find the Mitsubishi Spark Plug Ignition Coil Replacement guide helpful. Check these troubleshooting and repair guides for more help on your Mitsubishi.
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