Wrangler JK Spark Plug Specifications

Spark plugs are extremely important to the overall performance of your JK Wrangler. The type, quality and performance ratings for the plugs you use matter, as they are not all created equal. Spark plugs that are functioning properly will deliver a spark from the Jeep’s ignition to ignite the fuel/air combination in the engine. Spark plugs will have threaded metal shells, usually insulated by porcelain. The spark plug connects to the ignition system through the sparkplug wire. It is important to match the right spark plug to your JK Wrangler model as failing to do this will significantly lower your engine’s operating efficiency. Keep in mind that if you’ve done any mods on your engine, then you may need different spark plugs to handle the increased load. The charts below will give you an idea of the type of spark plug you will need.