Ignition Coil and Iridium Spark Plugs for Jeep Liberty (2002-2008) 3.7L

Direct-Fit Ignition Coil and Iridium Spark Plug Service Kit for 2002-2008 Jeep Liberty

What it Does: Complete primary and secondary ignition overhaul kit engineered to eliminate misfires, stabilize idle fluctuations, and restore factory combustion efficiency across all six cylinders.

The Stock Liberty Secondary Ignition Breakdown

The PowerTech V6 engine bay operates under high thermal loads that degrade factory coil insulation and epoxy encapsulation over time. Thermal cycling causes micro-cracking in the coil housing, allowing dielectric breakdown, secondary voltage leakage, and internal shorting. Concurrently, factory copper or platinum plugs suffer from rapid electrode erosion and gap widening, increasing the required firing voltage and over-stressing the coil drivers, leading to erratic cylinder misfires (P0300–P0306) under towing and load transitions.

The Engineering Solution

This comprehensive kit upgrades the secondary ignition circuit with high-grade internal copper windings and reinforced dielectric housings designed to resist thermal degradation and internal breakdown. Paired with fine-wire iridium spark plugs featuring laser-welded tips, the kit delivers high-melting-point spark stability and reduced required voltage. Direct-fit blade terminals and factory-profile boots seal out moisture and oil vapor, ensuring optimal dwell response and consistent spark energy across the full RPM range.

Technical Specifications

Compatibility

• 2002-2007 Jeep Liberty (KJ Chassis) 3.7L V6 (Sport, Limited, Renegade)
• 2008 Jeep Liberty (KK Chassis) 3.7L V6 (Sport, Limited)

The Jeep Off-Road Reliability Standard

Engineered to handle the low-RPM torque demands of trail crawling, steep grade climbing, and towing, this ignition package delivers consistent high-voltage delivery in harsh, high-vibration off-road environments without voltage degradation.