Ignition Coil & Iridium Spark Plugs for Toyota 4Runner (2003-2009) 4.7L V8

High-Energy Ignition Coil & Iridium Spark Plugs for 2003-2009 Toyota 4Runner (2UZ-FE / N210)

Direct Replacement Ignition Kit: Restores lost power and eliminates misfires by providing a consistent, high-voltage spark to the 2UZ-FE cylinders under heavy load and daily driving conditions.

The Stock 4Runner Ignition Degradation

Over thousands of thermal cycles, the OEM ignition coils on the 4.7L 2UZ-FE engine suffer from internal winding resistance breakdown and degraded epoxy potting. This manifests as weak spark, rough idle, increased fuel consumption, and eventual P0300-series misfire codes. Furthermore, standard spark plug electrodes erode over time, widening the spark gap. This increased gap forces the aging coils to work harder to jump the arc, compounding the thermal stress on the internal coil drivers and leading to premature failure, especially under towing or high-load conditions where combustion chamber pressures are highest.

The Engineering Solution

This ignition service kit resolves weak spark issues by combining heavily insulated, high-output ignition coils with performance iridium spark plugs. The upgraded coils feature premium copper windings with a specialized high-temperature dielectric epoxy potting, effectively shielding internal components from the V8's notorious valley heat soak. This ensures maximum voltage transfer without arching or cross-firing. Paired with the ultra-fine iridium center electrodes of the included spark plugs, the system requires less voltage to bridge the gap while generating a hotter, more concentrated spark kernel. This optimizes combustion efficiency, improves throttle response, and provides exceptional resistance to electrode wear and oxidation for long-term reliability.

Technical Specifications

Compatibility

• 2003 Toyota 4Runner 4.7L V8
• 2004 Toyota 4Runner 4.7L V8
• 2005 Toyota 4Runner 4.7L V8
• 2006 Toyota 4Runner 4.7L V8
• 2007 Toyota 4Runner 4.7L V8
• 2008 Toyota 4Runner 4.7L V8
• 2009 Toyota 4Runner 4.7L V8

The Toyota Durability Standard

Engineered for the demands of off-road trails and heavy towing, this ignition kit restores the legendary reliability of the 2UZ-FE, ensuring consistent torque delivery and preventing mid-trip misfires.