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Spark Plug Test

  1. Remove the spark plug and connect to the ignition coil.
    Fig 1: Identifying Spark Plug
    G06671940Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
  2. 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 Spark Plug Condition
    G06671941Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.