Ignition Coil and Iridium Spark Plugs for Ford F-150 (2018-2021) 5.0L

Direct-Fit Ignition Coil and Iridium Spark Plug Kit for 2018-2021 Ford F-150

What it Does: Replaces degraded factory coil packs and worn spark plugs to eliminate misfires, restore lost combustion efficiency, and stabilize high-load ignition delivery across all eight cylinders.

The Stock F-150 Thermal Degradation & Dielectric Breakdown

The 5.0L Coyote engine operates with high cylinder pressures, dual-injection fuel delivery, and a 12.0:1 compression ratio that generates intense cylinder head temperatures. Over sustained operating cycles, factory coil-on-plug (COP) assemblies experience thermal breakdown within their secondary internal windings and silicone boots. This dielectric deterioration allows secondary voltage leakage and high-rpm spark blowout, resulting in uneven idle, sluggish throttle response, and diagnostic misfire codes (P0300–P0308) during heavy towing or wide-open throttle transitions.

The Engineering Solution

This comprehensive ignition service pack includes eight coil-on-plug units constructed with premium internal copper windings for stable primary-to-secondary voltage transformation and direct-fit blade terminal connectors. Paired with eight fine-wire iridium spark plugs, the kit reduces the required arc voltage while resisting electrode erosion under high-temperature combustion. The durable molded housing and thermal-resistant boots prevent tracking and dielectric flashover, ensuring a precise, high-energy spark curve across the entire RPM band.

Technical Specifications

Compatibility

• 2018 Ford F-150 5.0L V8 (XL, XLT, Lariat, King Ranch, Platinum)
• 2019 Ford F-150 5.0L V8 (XL, XLT, Lariat, King Ranch, Platinum)
• 2020 Ford F-150 5.0L V8 (XL, XLT, Lariat, King Ranch, Platinum)
• 2021 Ford F-150 5.0L V8 (XL, XLT, Lariat, King Ranch, Platinum, Tremor)

The Ford Towing & Heavy-Duty Caliber

Engineered to withstand the demanding thermal profiles of heavy hauling and payload duty, this ignition package delivers consistent flame kernel propagation without spark blowout or voltage drop under load.