Honda Spark Plug & Ignition Coil Replacement

Is your Honda engine misfiring, has a rough noise during engine idling, has a slow engine start, and the check engine light is on? Learn how to fix the problem by replacing your spark plugs and ignition coils.

Changing the spark plugs on a Honda is easy and can be completed in under one hour. The video in this guide is from a 2015 Honda Civic with a four-cylinder engine. This guide will also help owners of Honda Accord, CR-V, Fit, and other models with the four-cylinder engine.

What you will need

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• Honda Iridium Spark Plugs
  • Do not gap iridium spark plugs.
  • Older Honda vehicles use copper and platinum spark plugs.
  • OEM Honda sparks Denso and NGK make plug brands.
• Honda Ignition Coils

Tools Needed

• 5/8″ Spark Plug Socket
• 3/8″ Ratchet Wrench
• 10mm Socket
• 8″ Extension
• Anti-seize grease

Procedure

1. Park your Honda in a safe location. Set the parking brakes and remove the key.
2. Pull the hood release under the hood to open the hood.
3. It is recommended to disconnect the battery negative terminal and allow the engine to cool down before you get started.
4. Remove the engine cover if your Honda has one. There will be two or four 10mm bolts that need to be removed. Unplug the electrical connector from the ignition coil by pressing first, then pulling the connector away from the plug.
5. Remove the 10mm bolts that secure the ignition coils.
6. Pull out the ignition coil. If the coils don’t come out, try twisting them slightly.
7. Use the spark plug socket, extension, and ratchet to remove the spark plugs.
8. Apply anti-seize grease to the threads of the new spark plug. Only apply a thin coat on the thread.
9. Slowly move the new spark plugs into the head. Do not drop the spark plugs as this can damage the spark plug.
10. Once the gasket has made contact with the cylinder head, use the torque wrench to tighten them to the recommended tightening torque. Torque Honda spark plugs to specification. Typical Honda spark plug torque is 13 ft/lb, 156 in-lb, 17.63 Nm.
11. Install the ignition coil by pressing them down firmly on the spark plug.
12. Connect all the wires to the ignition coil. Do not swap the electrical connectors; they need to return to the same position as before.

Tips

• Don’t use power tools to screw the spark plugs.
• If you accidentally strip the spark plug thread, you must remove or repair the head.
• Another possible solution to fix stripped Honda spark plug threads is to use a Spark Plug Thread Repair kit or heli-coil.
• The tightening torque for a spark plug changes with the diameter of the spark plug.

Torque Specification

Typical Honda spark plug torque is 13 ft/lb, 156 in-lb, 17.63 Nm. Verify by calling your dealer.

Recommended Interval

Honda vehicles are very reliable, but many owners forget that spark plugs are a maintenance item and should be replaced around the 80,000 and 100,000-mile mark. Many owners forget to change the spark plugs on their Honda until they get an engine misfire or hits 150k or even 200k miles.

Check Engine Light Still On

If the check engine light is still on after you replace the spark plugs and ignition coils, you can use the YOUCANIC Full System Scanner to clear the stored codes. This scanner can also read and clear fault codes through every control module of the Honda vehicle.

Frequently Asked Questions