Ignition Coil & Iridium Spark Plugs for Toyota Crown Mark X (2004-2019) 2.5L 3.5L V6

High-Output Ignition Coil & Iridium Spark Plug Kit for 2004-2019 Toyota Crown

Replaces degraded factory ignition components with upgraded copper-wound coils and iridium spark plugs to restore optimal spark energy and resolve intermittent misfires under load.

The Stock GR-Series Ignition Weakness

Over time, the factory ignition coils in the Toyota 4GR-FSE and 2GR-FSE V6 engines are prone to thermal degradation. Positioned directly above the exhaust components in the engine bank, these coils experience severe heat soak cycles. This constant thermal stress breaks down the internal epoxy potting and primary windings, leading to increased electrical resistance, weak spark output, and eventually, erratic cylinder misfires. Additionally, standard spark plug electrodes erode over tens of thousands of miles, increasing the spark gap and forcing the coils to work harder, which drastically accelerates their failure rate.

The Engineering Solution

This comprehensive ignition kit engineers out factory thermal vulnerabilities. The upgraded coils utilize heavy-gauge copper wire for primary and secondary windings, significantly lowering internal electrical resistance for stronger magnetic field generation. High-dielectric epoxy resin completely seals the internal circuitry, effectively resisting the severe heat soak typical of the GR engine bay. Paired with fine-wire Iridium spark plugs—which require less voltage to bridge the gap while heavily resisting electrode erosion—this kit increases overall spark energy by 15%. This ensures a smoother idle, precise throttle response, and complete fuel combustion across the entire RPM range.

Technical Specifications

Compatibility

• 2004-2019 Toyota Crown 2.5L V6 (4GR-FSE)
• 2004-2019 Toyota Crown 3.5L V6 (2GR-FSE / 2GR-FKS)
• 2004-2019 Toyota Mark X 2.5L V6 (4GR-FSE)
• 2004-2019 Toyota Mark X 3.5L V6 (2GR-FSE)

The Toyota Standard

Restoring the smooth, linear power delivery of your JDM V6 is critical to factory drivability. This comprehensive ignition overhaul ensures your Crown or Mark X maintains its renowned refinement and reliable acceleration without dreaded hesitation or check engine lights.