Ignition Coil + Spark Plugs for Ford F-150 (2018-2021) 3.3L

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

What it Does: The ignition coil and spark plug kit replaces deteriorated factory coil-on-plug units and worn plugs on the 2018-2021 Ford F-150 to eliminate secondary winding breakdown, resolve misfire codes, and restore factory combustion efficiency.

The Stock Ford F-150 Coil-on-Plug & Thermal Fatigue Breakdown

Under repeated thermal cycling and sustained towing demands, factory coil packs on the Duratec 33 3.3L V6 suffer from dielectric insulation breakdown within the primary and secondary copper windings. Micro-cracking in the OEM epoxy potting allows voltage to leak to ground rather than discharging across the plug gap. In conjunction with electrode erosion on high-mileage spark plugs, increased resistance stresses the internal driver circuits, manifesting as hesitations under load, irregular idle frequency, and P0300-P0306 cylinder misfire trouble codes.

The Engineering Solution

This direct replacement service kit features six matched ignition coils paired with precise-gap spark plugs to restore factory energy transfer. Each coil-on-plug unit is engineered with high-dielectric epoxy potting and copper winding cores designed to resist thermal degradation and internal shorting. The included spark plugs feature factory heat ranges to resist fouling and pre-ignition. Replacing coils and plugs simultaneously guarantees uniform secondary circuit resistance across all cylinders, restoring snappy throttle response and stoichiometric combustion stability without modification.

Technical Specifications

Compatibility

• 2018 Ford F-150 3.3L V6 (XL, XLT)
• 2019 Ford F-150 3.3L V6 (XL, XLT)
• 2020 Ford F-150 3.3L V6 (XL, XLT)
• 2021 Ford F-150 3.3L V6 (XL, XLT)

Frequently Asked Questions

Does this fit the P552 and P702 F-150?
Yes, this is a direct fit for the 2018-2021 Ford F-150 equipped with the 3.3L Duratec 33 PFDI engine across both the P552 and P702 chassis generations.

Do these ignition coils require an aftermarket ECU calibration?
No, these coils and plugs match factory resistance profiles and operate seamlessly with the stock Ford powertrain control module.

The Ford Towing & Utility Standard

Built for the work cycle demands of the F-Series platform, this ignition refresh package maintains uninterrupted spark output under severe engine loads, heavy towing, and extended payload hauls.