Ignition Coil and Iridium Spark Plugs for Ford F-150 (2005-2010) 5.4L

Direct-Fit Ignition Coil and Iridium Spark Plug Kit for 2005-2010 Ford F-150

What it Does: Delivers a complete high-voltage ignition refresh to restore factory combustion efficiency, eliminate low-load misfires, and stabilize idle across all 8 cylinders.

The Stock F-150 Ignition Weakness

The 5.4L 3-Valve Triton engine is prone to secondary ignition breakdown caused by thermal fatigue and dielectric breakdown inside aged coil-on-plug (COP) boots. Over time, high underhood heat cycles degrade the factory copper windings, while thermal expansion causes micro-arcing between the boot and cylinder head recess. Combined with worn factory spark plug electrodes that demand increased ionization voltage, this degradation leads to unburnt fuel cycles, hesitation under heavy towing load, and catalytic converter-damaging misfires.

The Engineering Solution

This ignition kit pairs 8 direct-replacement coil assemblies with fine-wire iridium spark plugs to maximize spark energy and arc stability. Each coil is engineered with high-conductivity internal copper windings insulated by vacuum-potted epoxy, preventing internal flashover under extreme cylinder pressures. Matched with iridium plugs that require lower firing voltage and resist electrode erosion up to four times longer than standard copper, this setup ensures crisp throttle response, zero spark blowout, and complete air-fuel burn.

Technical Specifications

Compatibility

• 2005-2008 Ford F-150 (P221) 5.4L V8 Triton (FX4, King Ranch, Lariat, STX, XL, XLT)
• 2009-2010 Ford F-150 (P415) 5.4L V8 Triton (FX4, Harley-Davidson, King Ranch, Lariat, Platinum, STX, XL, XLT)

The Ford Truck Standard

Engineered to withstand sustained thermal stress and high-load towing demands, this ignition package ensures dependable cold starts, rock-solid idle stability, and consistent torque delivery whether hauling heavy payloads or navigating rough job sites.