Inspect Spark Plug

Remove the spark plug cable.
NOTE: When removing the spark plug cable, pull on the spark plug cable boot (not the cable), as it may be damaged.

Fig 1: Identifying Spark Plug Cables
Courtesy of KIA MOTORS AMERICA, INC.
Using a spark plug socket, remove the spark plug.
CAUTION: Be careful that no contaminates enter through the spark plug holes.
Inspect the electrodes (A) and ceramic insulator (B).

Fig 2: Inspecting Spark Plug Electrodes
Courtesy of KIA MOTORS AMERICA, INC.

Fig 3: Electrode Diagnostic Chart
Courtesy of KIA MOTORS AMERICA, INC.
Check the electrode gap (A).
Standard: 1.0-1.1 mm (0.0394-0.0433 in.)

Fig 4: Checking Electrode Gap
Courtesy of KIA MOTORS AMERICA, INC.