Ignition Coils & Spark Plugs for Ford Expedition (1998-2004) 4.6L 5.4L

High-Output Ignition Coils & Spark Plugs for 1998-2004 Ford Expedition (Modular V8 / UN93 / U222)

Designed for high-mileage Modular V8 engines, this complete ignition service kit replaces degrading factory coils and plugs to restore lost spark energy, eliminate misfires, and improve combustion efficiency.

The Stock UN93 / U222 Ignition Shortcomings

The Ford 4.6L and 5.4L Modular V8s are notorious for ignition degradation, primarily centered around the factory Coil-on-Plug (COP) architecture. Over thousands of intense heat cycles, the factory epoxy degrades, leading to micro-cracks in the coil housing. Once moisture intrudes into the spark plug wells—a frequent issue due to aging cowl weatherstripping or intake manifold coolant crossover leaks—the voltage arcs directly to the cylinder head rather than jumping the plug gap. This creates heavy engine shuddering under load, flashing CELs for P0300-series misfires, unburnt fuel washing the cylinder walls, and a severe drop in low-end torque right when you need it for towing or merging.

The Engineering Solution

This comprehensive 8-pack of ignition coils and performance spark plugs provides a direct-fit overhaul to permanently cure Triton V8 ignition flaws. The coils are wound with high-conductivity copper wire to maximize voltage output and reduce primary resistance, ensuring a significantly hotter spark even under high cylinder pressures. Encased in high-dielectric epoxy and shielded by heat-resistant silicone boots, these units are specifically engineered to block moisture intrusion and resist thermal breakdown. Paired with the included performance spark plugs, which feature an optimized electrode design to lower the required firing voltage, this kit establishes a highly stable flame kernel. The result is a more complete fuel burn, restored throttle response, stabilized idle, and reliable hauling capability without the risk of spark blowout under heavy load.

Technical Specifications

Compatibility

• 1998 Ford Expedition 4.6L V8 & 5.4L V8
• 1999 Ford Expedition 4.6L V8 & 5.4L V8
• 2000 Ford Expedition 4.6L V8 & 5.4L V8
• 2001 Ford Expedition 4.6L V8 & 5.4L V8
• 2002 Ford Expedition 4.6L V8 & 5.4L V8
• 2003 Ford Expedition 4.6L V8 & 5.4L V8
• 2004 Ford Expedition 4.6L V8 & 5.4L V8

The Ford Hauling Standard

Built to handle the demanding thermal loads of full-size SUV towing and sustained hauling, these ignition components restore the rugged, dependable low-end torque the Modular V8 is known for, keeping your rig pulling strong and out of the repair bay.