Ignition Coil & Iridium Spark Plugs for Lexus LS430 (2001-2006) 4.3L V8

Complete Ignition Overhaul Kit for 2001-2006 Lexus LS (3UZ-FE / UCF30)

What it Does: This comprehensive ignition kit replaces degrading factory coils and worn plugs to restore proper spark timing, eliminate misfires, and stabilize the idle on your 4.3L V8.

The Stock 3UZ-FE Ignition Degradation

Factory ignition coils on the UCF30 chassis undergo severe thermal cycling due to their nested location within the 3UZ-FE cylinder heads. Over a 100,000+ mile lifespan, the epoxy resin sealing the primary and secondary coil windings becomes brittle and cracks. This leads to voltage leaks, weak spark output, and localized heat soak issues. Furthermore, OEM spark plug electrodes wear down over time, increasing the gap and forcing the degrading coils to work harder to jump the spark, ultimately resulting in premature coil failure, rough idle characteristics, hesitation under load, and persistent P0300-series misfire codes.

The Engineering Solution

This ignition service kit bundles high-output ignition coils and performance iridium spark plugs to completely refresh the secondary ignition system. The coils feature upgraded thermal-resistant epoxy potting and high-grade silicone boots that repel moisture and resist dielectric breakdown even in the high-heat environment of the 4.3L V8 engine bay. Paired with iridium-tipped spark plugs—which offer superior conductivity and a much higher melting point than standard copper or platinum plugs—this kit ensures a concentrated, powerful spark. The ultra-fine iridium center electrode lowers the required voltage threshold to cross the gap, reducing the strain on the ignition coils and ensuring complete combustion for restored throttle response and fuel efficiency.

Technical Specifications

Compatibility

• 2001 Lexus LS430 4.3L V8
• 2002 Lexus LS430 4.3L V8
• 2003 Lexus LS430 4.3L V8
• 2004 Lexus LS430 4.3L V8
• 2005 Lexus LS430 4.3L V8
• 2006 Lexus LS430 4.3L V8

The Lexus Precision Standard

Restoring your flagship luxury sedan requires parts that meet strict factory tolerances. This ignition kit guarantees a stable idle, factory-smooth acceleration, and an entirely CEL-free driving experience, returning the legendary 3UZ-FE to its refined operational baseline.