Ignition Coil & Iridium Spark Plugs for Jeep Grand Cherokee (2005) 5.7L V8

High-Output Ignition Coil & Iridium Spark Plugs for Jeep Grand Cherokee

Direct OEM-replacement ignition system upgrade designed to eliminate misfires and restore combustion efficiency.

The Stock Grand Cherokee Ignition Shortcoming

The factory ignition coils on the 5.7L HEMI V8 are prone to thermal degradation over time due to continuous heat soak within the engine bay. This prolonged exposure breaks down the internal epoxy potting and primary windings, leading to weak spark energy and increased resistance. When coupled with standard or worn spark plugs, the resulting incomplete combustion manifests as rough idling, hard starting, increased fuel consumption, and persistent cylinder misfire codes (P0300 series) that trigger the check engine light.

The Engineering Solution

This comprehensive ignition overhaul addresses OEM deficiencies by pairing high-energy ignition coils with premium iridium spark plugs and high-grade silicone spark plug wires. The upgraded coils feature enhanced primary and secondary copper windings with superior insulation, delivering a consistently higher and more stable voltage output directly to the electrodes. The included iridium spark plugs offer a significantly higher melting point than standard copper or platinum plugs. This allows the fine-wire iridium center electrode to maintain its precise shape under extreme cylinder temperatures, promoting a hotter, more concentrated spark. This hotter spark effectively burns off carbon deposits, preventing plug fouling and ensuring complete atomized fuel ignition. The result is restored horsepower, stabilized idle, and optimized fuel economy without requiring modifications to the factory wiring harness.

Technical Specifications

Compatibility

• 2005 Jeep Grand Cherokee 5.7L V8

The Jeep Durability Standard

Whether navigating technical off-road trails or towing heavy payloads, reliable ignition is critical. This comprehensive kit ensures your HEMI maintains the robust, consistent power delivery required for sustained low-end torque and severe-duty applications.