Ignition Coil and Iridium Spark Plugs for Jeep Grand Cherokee (2005-2008) 3.7L

Direct-Fit Ignition Coil and Iridium Spark Plug Kit for 2005-2008 Jeep Grand Cherokee

What it Does: Restores factory secondary ignition output and spark energy across all six cylinders on the 3.7L PowerTech V6 engine.

The Stock Grand Cherokee Ignition Degradation

The factory coil-on-plug units on the WK Grand Cherokee suffer from internal epoxy breakdown and insulation fatigue due to sustained underhood heat cycling. Over time, high thermal load degrades the primary and secondary copper windings, causing dielectric puncture, micro-arcing, intermittent misfires under heavy throttle load, rough idle, and unburned fuel dumping into the catalytic converters. Standard copper plugs also experience rapid gap erosion, placing excessive voltage demand on aging coils.

The Engineering Solution

This comprehensive tune-up kit features six heavy-duty ignition coil packs manufactured with high-grade internal copper windings, reinforced thermoplastic housings, and corrosion-resistant blade terminals for maximum conductivity and thermal stability. Paired with six fine-wire iridium spark plugs, the system provides a concentrated spark kernel, superior anti-fouling resistance, lower required firing voltage, and stable combustion under high engine load.

Technical Specifications

Compatibility

• 2005 Jeep Grand Cherokee 3.7L V6 (Laredo)
• 2006 Jeep Grand Cherokee 3.7L V6 (Laredo)
• 2007 Jeep Grand Cherokee 3.7L V6 (Laredo)
• 2008 Jeep Grand Cherokee 3.7L V6 (Laredo)
• Interchange OE: UF270, UF-270, 56028138, 56028138AB, 56028138AD, 56028138AE, 56028138AF, UF297, UF399, ZFR6FGP, 52-2034, 5C1114, E232, 178-8483

The Jeep Durability Standard

Built to handle off-road vibration, high ambient engine bay temperatures, and steep grade towing demands, this ignition package delivers consistent high-voltage discharge to ensure smooth idle and reliable torque delivery across rough terrain.