Ignition Coil + Spark Plugs for Ford F-250 (2005-2007) 5.4L

Direct-Fit Ignition Coil and Spark Plug Kit for 2005-2007 Ford F-250 (P221)

What it Does: The ignition coil and spark plug kit replaces degraded factory ignition hardware on the 2005-2007 Ford F-250 5.4L to eliminate under-load spark blow-out and restore stable combustion under heavy hauling loads.

The Stock Ford F-250 Secondary Voltage Breakdown

The 5.4L Triton 3V modular engine in the P221 chassis is notorious for ignition breakdown under high thermal stress. Factory DG511 / FD508 coil packs suffer from internal epoxy breakdown and boot dielectric failure, which allows high-voltage arc-through to the cylinder head rather than across the spark plug gap. Combined with electrode erosion on aging plugs, the increased resistance causes noticeable low-RPM bucking, misfires (DTC P0300-P0308), and unburned fuel entering the exhaust tract.

The Engineering Solution

This comprehensive tune-up kit replaces all eight cylinders simultaneously to balance secondary ignition output. The high-performance ignition coils feature reinforced copper primary and secondary windings encased in high-temp dielectric epoxy, eliminating internal shorting under thermal expansion. Paired with platinum-tipped spark plugs engineered for superior resistance to thermal erosion, this setup maintains consistent gap tolerances and optimizes spark duration for lean air-fuel mixtures during towing conditions.

What's Included

• 8 High Performance Ignition Coils (Replacement for FD508 / DG511)
• 8 Platinum Spark Plugs

Technical Specifications

Compatibility

• 2005-2007 Ford F-250 Super Duty 5.4L V8 (XL, XLT, Lariat, King Ranch)

Frequently Asked Questions & Fitment Warnings

Does this fit the P221 F-250?

Yes, this is a direct fit for the 2005-2007 Ford F-250 equipped with the 5.4L Triton 3V engine. This kit does not fit 2-valve 5.4L engines, 6.8L V10, or Power Stroke diesel platforms.

Are separate spark plug wires required for this installation?

No, this application utilizes a direct Coil-on-Plug (COP) configuration where the coil connects directly to the plug terminal without remote plug wires.

The Ford Workhorse Standard

Built to handle sustained operating temperatures and high duty cycles, this ignition package delivers the primary spark energy required to maintain heavy-duty towing reliability across demanding work environments.