Ignition Coil and Iridium Spark Plugs for Mercury Mountaineer (2002-2010) 4.6L

Direct-Fit Ignition Coil and Iridium Spark Plug Kit for 2002-2010 Mercury Mountaineer

What it Does: Restores factory ignition dwell, eliminates secondary voltage breakdown, and ensures dependable combustion across all eight cylinders on the 4.6L Modular V8.

The Stock Mountaineer Ignition Degradation

Factory coil-on-plug (COP) assemblies on the Ford Modular 4.6L V8 frequently suffer from thermal fatigue after repeated heat cycling. Over time, the internal epoxy encapsulation cracks and the silicone spark plug boots harden, resulting in dielectric breakdown and high-voltage flashover to the cylinder head walls. This manifests as intermittent under-load misfires (DTCs P0300–P0308), rough idling, diminished fuel economy, and power hesitation during acceleration.

The Engineering Solution

This complete 8-cylinder ignition kit replaces degraded OEM units with heavy-duty coil packs featuring high-conductivity copper primary and secondary windings for stable voltage output and thermal endurance. Paired with fine-wire iridium spark plugs, the system lowers required firing voltage, provides superior resistance to electrode erosion, and promotes reliable flame kernel development under heavy load and towing conditions.

Technical Specifications

Compatibility

• 2002-2010 Mercury Mountaineer (4.6L V8 - Base, Premier, Convenience, Luxury Trims)

The Mercury Towing & Utility Standard

Engineered to handle sustained thermal stress, this complete ignition refresh maintains steady dwell times and crisp throttle response, ensuring reliable torque delivery when towing, climbing grades, or daily driving.