Ignition Coil and Iridium Spark Plugs for Lexus RX (2004-2008) 3.3L

Direct-Fit Ignition Coil and Iridium Spark Plug Service Kit for 2004-2008 Lexus RX

What it Does: Restores factory ignition performance, eliminates primary/secondary circuit misfires, and stabilizes engine idle across all 6 cylinders in the 3.3L V6 powertrain.

The Stock RX Ignition Degradation and Thermal Breakdown

Under-hood thermal cycling in the transverse 3.3L engine bay accelerates epoxy degradation within the factory coil packs. Over time, high heat breaks down the internal primary and secondary copper windings, causing dielectric breakdown, micro-arcing, and intermittent cylinder misfires under load. Simultaneously, aged spark plug electrodes experience gap widening from electrical erosion, increasing secondary voltage demand and placing excessive strain on the driver transistors in the ignition system.

The Engineering Solution

This complete 6-cylinder tune-up kit features heavy-duty coil-on-plug assemblies engineered with high-grade magnetic core steel, durable internal copper windings, and heat-resistant silicone boots to prevent flashover. Paired with fine-wire iridium spark plugs, the kit lowers ignition voltage requirements, delivers a highly focused spark kernel for complete combustion, and resists carbon fouling under severe thermal stress.

Technical Specifications

Compatibility

• 2004-2006 Lexus RX330 3.3L V6 (3MZ-FE)
• 2006-2008 Lexus RX400h 3.3L V6 Hybrid (3MZ-FE)
• Interchange: UF-267, 90919-02207, 9091902234, 9008019016, 9091902207, 19080-46020, C528, C1175

The Lexus Refinement Standard

Engineered to meet stringent Japanese luxury tolerances, this ignition system ensures factory-smooth power delivery, rapid cold-start ignition, and long-term misfire prevention without triggering check engine lights.