Spark Plug Test

WARNING: This page is about a different variant/trim than selected.

Remove the spark plug and connect to the ignition coil.

Fig 1: Removing Spark Plug
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: Identifying Defective Insulation Of Spark Plug
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.