Ignition Coil & Iridium Spark Plugs for Infiniti FX35 (2009-2012) 3.5L

High-Output Ignition Coil & Iridium Spark Plugs for 2009-2012 Infiniti FX35 (VQ35HR/S51)

Direct Replacement Ignition Kit: Restores peak spark voltage and combustion efficiency to resolve misfires and rough idling in the 3.5L VQ35HR engine.

The Stock FX35 Ignition Degradation

Over time, the OEM ignition coils on the S51 chassis degrade due to continuous heat soak from the high-revving VQ35HR engine. Factory epoxy and internal windings break down, causing internal arcing and increased electrical resistance. This weak spark delivery leads to cylinder misfires under load, hesitation, and unburnt fuel entering the exhaust stream, risking catalytic converter damage. Standard spark plug electrodes also wear down over high mileage, widening the spark gap and forcing aged coils to work harder, which rapidly accelerates coil pack failure.

The Engineering Solution

This replacement package combines high-dielectric epoxy coils with precision-gapped iridium spark plugs for a thermally stable ignition system. The coils utilize upgraded copper wiring in the primary and secondary bobbins, minimizing resistance and ensuring consistent high-voltage output despite extreme engine bay heat. The spark plugs feature a fine-wire iridium center electrode, providing superior conductivity and a high melting point. This requires less voltage to arc while resisting erosion, maintaining precise gap tolerances. The combination guarantees complete cylinder combustion, stabilizing idle vacuum, and eliminating P0300-series misfire codes.

Technical Specifications

Compatibility

• 2009 Infiniti FX35 3.5L V6
• 2010 Infiniti FX35 3.5L V6
• 2011 Infiniti FX35 3.5L V6
• 2012 Infiniti FX35 3.5L V6

The Infiniti Reliability Standard

Designed to meet the precise tolerances of Japanese engineering, this ignition overhaul ensures smooth power delivery, optimized fuel economy, and a complete resolution to CEL misfire alerts for the VQ35HR platform.