Spark Plug Test

WARNING: This page is about a different car, the 2006 Mitsubishi Montero. However, it is still accessible from the selected car via links, so may be relevant.

Remove the spark plug and connect to the spark plug cable.

Fig 1: Checking For Spark
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
Ground the spark plug outer electrode (body), and crank the engine.
Check that there is an electrical discharge between the electrodes at this time.

Fig 2: Checking Electrical Discharge Between Electrode
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.