Time to replace worn spark plugs! I bought iridium plugs for longer lifespan and better fuel economy.
Step 1: Remove the Cowling.
On most vehicles there is a cowling to protect the plugs. This one had 3 Phillips head screws to remove plus the engine oil cap.
Step 2: Assemble the Spark Plug Spanner!
I used a heavy duty 1/2inch drive and spark plug deep socket to remove and install the plugs. The extension bar is specifically for getting at spark plugs since it allows for a wobble with the socket.
Step 3: Remove the Plugs.
The driver bar makes it really easy to remove the old plugs.
Step 4: Stupid Design by Kia.
Two of the plugs were blocked by a wire harness. I don't know why engine designers do this crap for. Very very stupid design.
Step 5: Comparing Old and New.
The copper plug has a fat tip whereas the iridium has a narrow tip.
Step 6: Install the New Plugs and Complete the Job.
Installation is the reverse of removal. Tightening of the new plugs should be done with a torque wrench, or in the absence of one, just dont arm wrestle the plug!
Now the car runs a bit better and has improved fuel economy.