How to Change Your Spark Plugs

This is different for every car, but typically you need to change these every 50,000-100,000 miles.

Go to you parts store and get the spark plugs you need.

Tools needed for a 2007 Honda Fit
Flat head screw driver
10mm socket
Spark Plug Socket (cheap at parts store. Size depends on car, usually 5/8")
Ratchet for sockets
Extension for use with spark plug socket.


Step 1
Remove the plastic cover. The two 10mm bolts on the top and use the flat head to turn the plastic screws 90 degrees and remove cover.

Step 2
This car uses what is called a Coil On Plug design so I have to unbolt each ignition coil on top of each plug. These are located on the back of the motor and require the removal of one 10mm bolt each as well as unplugging the electrical connection.

Step 3
Remove each coil and keep track of which one went where. Not necessarily important but better be on the safe side to keep the engine from running oddly.

Step 4
Stick the spark plug socket onto the extension and then put them into the plug tube of the motor and make sure it is in the proper place. Then attach the ratchet and loosen the plug. It may be stuck so use some force if necessary. Remove the plug, it usually gets stuck in the rubber grommet in the socket and comes out with it. Mine only did this for the first plug, then I had to use a magnet for the rest. My socket is a bit worn out though.

Old vs New

Step 5
Insert new plug into socket, then using just the socket and extension, screw the new plug in BY HAND so as not to cross thread, until it stops. Then attach the ratchet and tighten it the rest of the way. Tight, but not too tight, you don't want to risk stripping the threads out. Install them all.

Step 6
Reinstall everything you removed in reverse order of removal. Start car and make sure its running fine.

DONE