Ignition Coil & Iridium Spark Plugs for Toyota 4Runner FJ Cruiser (2010-2013) 4.0L V6

High-Output Ignition Coil & Iridium Spark Plug Kit for 2010-2013 Toyota FJ Cruiser (1GR-FE / GSJ15)

Direct-fit replacement ignition upgrade designed to restore factory spark energy and resolve misfire codes on aging 4.0L V6 engines. This complete package replaces degraded OEM ignition coils and worn spark plugs to optimize fuel burn, maintain consistent idle stability, and deliver reliable voltage under heavy engine load.

The Stock 1GR-FE Ignition Degradation

As the 4.0L 1GR-FE logs higher mileage, the factory ignition coils suffer from prolonged thermal cycling and heat soak within the engine bay. The internal epoxy potting compounds break down over time, leading to micro-cracking and parasitic voltage leaks. Simultaneously, factory spark plug electrodes erode, increasing the gap and forcing the ignition coils to work harder to bridge it. This combined degradation results in weak spark delivery, manifesting as rough idling, sluggish throttle response, unburnt fuel (decreased MPG), and eventual P0300-series misfire codes under load or during acceleration.

The Engineering Solution

This matched ignition coil and iridium spark plug set eliminates ignition-related performance drops by upgrading the engine's spark delivery network. The new ignition coils feature high-grade copper wire windings and reinforced dielectric boots, shielding against voltage bleed and resisting extreme engine bay temperatures. Coupled with performance iridium spark plugs, which utilize an ultra-fine center electrode, this kit requires less firing voltage while providing a concentrated, hotter spark. The result is a more complete combustion event, restoring the engine's original horsepower and torque output, improving throttle tip-in, and ensuring long-term reliability under severe operating conditions.

Technical Specifications

Compatibility

• 2010-2013 Toyota FJ Cruiser 4.0L V6
• 2010-2013 Toyota 4Runner 4.0L V6
• Interchange Part Numbers: 673-1309, 23-0480, 23-0525, 52-1894, 52-2092, C1601SPEC, EBC1039, CUF487, EBC1214, EBC1832, 26C1034, 90919A2005, C1601VC, 5C1653, IGC0176, C1596VC

The Toyota Durability Standard

Built to handle the harsh demands of trail riding and overland towing, this ignition kit ensures your 4.0L maintains critical engine reliability far off the grid, keeping power delivery smooth and preventing unexpected stalls on challenging off-road terrain.