Shadow Convertible L4-153 2.5L SOHC (1994)
Spark Plug: Testing and Inspection
Broken, Cracked or Chipped Insulator
ELECTRODE INSULATOR
Chipped Electrode Insulator
Electrode Insulator
A chipped electrode insulator usually results from bending the center electrode while adjusting the spark plug electrode gap. Under certain
conditions, severe detonation also can separate the insulator from the center electrode. A sudden rise in tip temperature or severe operating
conditions are also possible causes. Spark plugs with chipped electrode insulators must be replaced.
