- Before you begin the spark plug removal process make sure that you disconnect the negative battery cable to avoid any electrical shock. With the negative battery cable disconnected, proceed to remove the plastic cover located in the center of the valve cover by removing the screws that hold it in place.
- Next pull gently on no. 1 spark plug wire, pull it all the way out and set it aside.
- With the number one spark plug wire out of the way, proceed to disconnect the electrical connector from the ignition coil.
- To gain access to the spark plug in cylinder number 2 it is necessary to remove the ignition coil mounted directly on top of the spark plug, to remove the ignition coil all you need to do is remove the screws that secure the ignition coil in place and remove it from the vehicle.
- To remove the spark plugs, you will need a 5/8 deep socket, ( this special spark plug socket comes with most hand tool sets) , a long extension and a 3/8 ratchet, insert the socket all the way over the spark plug and loosen it in the same direction you would loosen a bolt.
- If your spark plug socket doesn't have a rubber insert, you will need a tool like the one in the picture to pull the spark plug out, if you don't have access to this tool, you can use a piece of rubber hose.
- Inspect each spark plug carefully, you will be able to gather information about the mechanical condition of your engine by analyzing the deposits accumulated on the spark plugs, the spark plug shown in this picture is the spark plug that came off of cylinder number 1 in the Kia Sephia, it shows normal wear and a low accumulation of carbon deposits, there is no sign of oil deposits or any signs of pre-ignition caused by low quality fuel.
- Depending on the spark plugs you choose to replace the ones you are taking off your vehicle, you may need to set the correct gap between the electrodes, this information can be found under the hood of your vehicle, we chose Autolite platinum spark plugs, most platinum spark plugs come pre-gapped, if you choose to re-gap platinum spark plugs, make sure that you use a soft tool ( made from brass or another soft material, otherwise you run the risk of ruining the platinum and making a new spark plug useless.
Apply a light coat of anti-seize compound to the threads on each spark plug, this will ensure easy removal during the next scheduled tune-up.