Changing your spark plugs is easy – if you can use a wrench, you can change your spark plugs. It may be one of the easiest ways to save yourself over $100 in under one hour! The Civic shown is a 2006 LX, but it will be exactly the same process for any (non-hybrid) civic from 2006 – 2011, and similar for many other vehicles. Honda recommends changing the spark plugs at 100k miles.
Tools you’ll need:
- Large flat-head screwdriver
- Socket Wrench with Extension Bar (10mm socket and 5/8 spark plug socket)
- Torque Wrench (optional – I don’t have one)
- Dielectric Grease (optional – I didn’t do this)
The next step is to remove the plastic cover with your screwdriver for easier access to the wiring harnesses. A quick quarter turn of the plastic screws will free it on the top and then it unhooks on the front.
Next, disconnect the wiring harnesses:
Use your 10mm socket wrench to remove the nut that holds on the plastic cover – these cover and attach to the plastic tubes that carry electricity down to the spark plugs.
With those nuts removed, the plastic tubes pull out easily:
With your 5/8 spark plug socket attached to the extension, unscrew the existing spark plug. They will take a little muscle to get started, but then they’ll unscrew easily.
After removing the existing spark plug, install a new one (after covering it with dielectric grease for additional sealing if desired) by hand-tightening it first and then using your wrench to tighten to 13-lbs. If you don’t have a torque wrench, just tighten it 2/3 of a turn past hand tight.
Marvel at how shiny your new spark plugs are compared to your dirty old ones: