Spark plugs carry a high voltage into the engine’s combustion chamber and convert it into a spark, igniting the air/fuel mixture. This generates the power that keeps the engine running. Even at idle, each spark plug fires over 175 times per minute. Over time, the spark plug’s tip (electrode) wears out. The outer shell (insulation) may even crack or separate allowing the voltage to exit the plug where it is not intended. Misfire results, causing the engine to run tough and increase emissions.
Replacement interval not to exceed:
Platinum Type: 60,000 miles
Iridium Type: 105,000 miles