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Reference Information

Spark Plug, RN11YC4, Copper Plus, 14mm Thread, .750 in. Reach, Projected Tip, Resistor, Jeep, Each

There are telltale signs of failing spark plugs: Slow acceleration, loss of power, poor fuel economy, engine misfires, and difficulty starting the car. When it's time for a tuneup, order Crown Automotive spark plugs designed for your vehicle application. These plugs have copper or nickel alloy electrodes, and will burn your fuel efficiently to keep the engine running strong. Crown spark plugs are manufactured to OE standards for proper fit and performance.