Ignition Coil and Iridium Spark Plugs for Ford F-350 (2005-2008) 5.4L

Direct-Replacement High-Output Ignition Kit for 2005-2008 Ford F-350

Complete Secondary Ignition Refresh: Replaces degraded factory coil packs and worn plugs to eliminate cylinder misfires and restore precise combustion under heavy payload and towing demands.

The Stock F-350 Ignition Breakdown

The 5.4L 3-Valve Modular V8 operates under high thermal stress in heavy-duty commercial applications. Over time, OEM coil housings suffer from heat soak and dielectric breakdown, leading to internal secondary winding short-circuits and spark blowout under load. Combined with electrode wear on aged plugs, this generates erratic idle, hesitations under torque load, and decreased fuel efficiency.

The Engineering Solution

This complete 8-cylinder service kit features coil-on-plug units wound with high-conductivity oxygen-free copper, sealed in high-dielectric epoxy potting to isolate secondary voltage and eliminate micro-arcing. Paired with fine-wire iridium spark plugs, the system reduces required firing voltage, provides superior resistance to carbon tracking, and maintains precise spark kernel delivery through extreme combustion pressures.

Technical Specifications

Compatibility

• 2005 Ford F-350 Super Duty 5.4L V8 (XL, XLT, Lariat, King Ranch)
• 2006 Ford F-350 Super Duty 5.4L V8 (XL, XLT, Lariat, King Ranch)
• 2007 Ford F-350 Super Duty 5.4L V8 (XL, XLT, Lariat, King Ranch)
• 2008 Ford F-350 Super Duty 5.4L V8 (XL, XLT, Lariat, King Ranch, FX4)

The Ford Heavy-Duty Standard

Designed to meet severe-duty commercial standards, this ignition package delivers consistent high-voltage arcs across continuous high-RPM grade climbs and heavy towing without thermal degradation or spark blowout.