Ignition Coil & Iridium Spark Plugs for Infiniti QX4 (2001-2003) 3.5L V6

High-Performance Ignition Coil & Iridium Spark Plugs for 2001-2003 Infiniti QX4

Direct replacement ignition coil packs and iridium spark plugs designed to restore optimal combustion, eliminate misfires, and stabilize idle in the VQ35DE engine.

The Stock VQ35DE Ignition Weakness

The factory ignition coils on the early VQ35DE engines are highly susceptible to thermal degradation due to their placement directly over the cylinder head. Over countless heat cycles, the internal epoxy resin degrades, leading to increased resistance and voltage leaks. Combined with worn standard spark plugs that experience accelerated electrode erosion, this heat soak inevitably results in cylinder misfires, a rough idle, noticeable hesitation under acceleration, and reduced fuel economy. When the factory coils degrade, they fail to deliver the necessary kilovolt output required to bridge the spark gap efficiently under load.

The Engineering Solution

This comprehensive ignition kit directly addresses these thermal limitations by utilizing high-dielectric epoxy and reinforced thermoplastic housings to resist engine bay heat soak and prevent voltage arcing. The upgraded coils feature premium copper windings tailored for consistent secondary voltage output, ensuring a potent and sustained spark duration. Paired with high-performance iridium spark plugs featuring an ultra-fine center electrode, this setup dramatically lowers the voltage requirement for spark propagation. The iridium alloy provides exceptional resistance to spark erosion and oxidation, delivering a highly concentrated spark that maximizes air-fuel burn efficiency, restores throttle response, and prevents unburned fuel from taxing the catalytic converters.

Technical Specifications

Compatibility

• 2001 Infiniti QX4 3.5L V6
• 2002 Infiniti QX4 3.5L V6
• 2003 Infiniti QX4 3.5L V6

The Infiniti Caliber

Built for the rugged yet refined JR50 chassis, ensuring optimal torque delivery for off-road trails and daily commuting, while keeping the engine codes clear and maintaining peak V6 reliability.