Ignition Coil & Iridium Spark Plugs for Honda RDX (2013-2015) 3.5L V6

High-Output Ignition Coils & Iridium Spark Plugs for 2013-2015 Acura RDX (J35Z2 / TB3/TB4)

What it Does: This complete ignition service kit replaces degraded factory coils and fouled spark plugs to restore optimal spark timing, resolve misfires, and improve fuel atomization efficiency in the 3.5L V6.

The Stock RDX Ignition Degradation

The factory ignition system on the J35Z2 engine is notorious for premature wear, heavily exacerbated by Honda's Variable Cylinder Management (VCM) system. When the VCM shuts down specific cylinders to save fuel, the inactive cylinders experience rapid temperature fluctuations and oil bypass, leading to severe carbon fouling on the spark plug electrodes. Furthermore, the OEM coil packs suffer from thermal degradation due to their placement in the hot V6 engine bay. Over time, the internal epoxy potting breaks down, increasing electrical resistance. This results in weak spark delivery, intermittent cylinder misfires, sluggish throttle response, and unburnt fuel entering the exhaust stream, which can eventually damage the catalytic converters.

The Engineering Solution

This comprehensive performance ignition upgrade directly addresses the J35's thermal and electrical shortcomings. The replacement ignition coils feature upgraded copper wire windings and high-temperature silicone boots, maximizing dielectric strength and preventing voltage leaks under heavy load. Paired with ultra-fine wire iridium spark plugs, this kit significantly lowers the voltage requirement for a spark while delivering a concentrated, higher-intensity kernel. The iridium alloy offers exceptional resistance to oxidation and VCM-induced carbon fouling, ensuring consistent ignition across all operating conditions. By guaranteeing a complete combustion cycle, this setup maximizes the 3.5L's torque curve, eliminates hesitation, and stabilizes idle vacuum.

Technical Specifications

Compatibility

• 2013 Acura RDX 3.5L V6
• 2014 Acura RDX 3.5L V6
• 2015 Acura RDX 3.5L V6
• Fitment Type: Direct Replacement
• Placement on Vehicle: Front
• Terminal Type: Blade
• Terminal Quantity: 3
• Kit Includes: 6 Performance Spark Plugs, 6 Ignition Coils
• Interchange Part Numbers: UF624, 93175, 178-8482, IC727, 49020, U5304, C-889, 1IC450, 50174, 36-8165, 5095, 2505-484797, E1124, 30520RN0A01, C1665, 2-50174
• Other Part Numbers: EBC1027, GN10426, 921-2154, SKUF624T, CUF603, 2IGC0436
• Superseded Part Numbers: 5C1681, 5C1722, IC727SB, UF624T, 673-2314, 23-0524, 52-2077

The Acura Precision Standard

Designed to exceed JDM factory specifications, this ignition overhaul ensures restored power, ultra-smooth VCM transitions, and long-term reliability without triggering a Check Engine Light (CEL).