Ignition Coil and Iridium Spark Plugs for Infiniti FX35 (2003-2008) 3.5L
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Direct-Fit Ignition Coil & Iridium Spark Plug Service Kit for 2003-2008 Infiniti FX35
Primary Function: Restores factory secondary ignition voltage and resolves multi-cylinder misfires by replacing degraded coil packs and worn spark plugs with high-dielectric assemblies and fine-wire iridium plugs.
The Stock FX35 Ignition Breakdown
The VQ35DE platform produces severe thermal cycling within the tight S50 engine bay, leading to premature breakdown of the factory epoxy potting and internal copper windings within the OEM ignition coils. Over time, high resistance leads to carbon tracking along the spark plug boots, causing intermittent secondary ignition dropouts, hesitation under load, poor cold-start combustion, and persistent P0300 through P0306 diagnostic trouble codes.
The Engineering Solution
This comprehensive ignition service kit utilizes upgraded high-conductivity copper windings insulated with superior dielectric epoxy to resist micro-cracking and heat soak. Paired with long-life fine-wire iridium spark plugs, the kit ensures low ignition voltage demand, stable flame kernel propagation, and a consistent high-energy spark across the entire RPM range. Direct-fit blade connectors and high-temp silicone boots prevent moisture intrusion and voltage arcing.
Technical Specifications
| Fitment | 2003-2008 Infiniti FX35 |
| Engine / Chassis | 3.5L VQ35DE V6 / S50 |
| Stock Output | 280 hp / 270 lb-ft (Approx) |
| Part Number / Cross Reference | UF349, C1406, 50075, 5C1403, 5C1793, C1736, E379, 52-1753, IC479, 22448-8J111, 22448-8J115, 22433-8J115, 22433-8J11C |
Compatibility
- 2003 Infiniti FX35 Base 3.5L V6 (VQ35DE / S50) - RWD & AWD
- 2004 Infiniti FX35 Base 3.5L V6 (VQ35DE / S50) - RWD & AWD
- 2005 Infiniti FX35 Base 3.5L V6 (VQ35DE / S50) - RWD & AWD
- 2006 Infiniti FX35 Base 3.5L V6 (VQ35DE / S50) - RWD & AWD
- 2007 Infiniti FX35 Base 3.5L V6 (VQ35DE / S50) - RWD & AWD
- 2008 Infiniti FX35 Base 3.5L V6 (VQ35DE / S50) - RWD & AWD
The Infiniti VQ Performance Standard
Engineered to meet the rapid throttle response and high-revving demands of the Nissan/Infiniti VQ architecture, this kit eliminates cylinder imbalances, optimizes air-fuel mixture ignition, and protects downstream catalytic converters from unburnt fuel contamination.
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