Ignition Coil and Iridium Spark Plugs for Ford F-150 (1998-2008) 4.2L

Direct-Replacement Ignition Coil and Iridium Spark Plug Kit for 1998-2008 Ford F-150

What it Does: The ignition coil pack and iridium spark plug kit replaces aged factory secondary ignition components on the 1998-2008 Ford F-150 to restore combustion efficiency, eliminate high-load misfires, and stabilize idle quality.

The Stock Ford F-150 Secondary Ignition Degradation

The factory waste-spark coil pack on the Essex 4.2L V6 endures severe thermal cycling and engine-bay heat soak, leading to internal epoxy breakdown, micro-cracking in the housing, and dielectric carbon tracking across the secondary terminals. Paired with aged standard plugs prone to rapid electrode erosion and wide gaps, aging PN96 and P221 chassis trucks routinely suffer secondary breakdown, cylinder misfires under towing load, and unburned fuel wash that degrades emissions equipment.

The Engineering Solution

This complete secondary ignition overhaul kit pairs a heavy-duty 6-tower coil pack with six fine-wire iridium spark plugs to exceed OEM benchmarks (interchange FD498 and 12597745). The coil assembly features premium silicon magnetic steel laminations and high-temperature copper windings sealed in vacuum-poured dielectric epoxy to prevent internal arcing under sustained dwell times. The included iridium-tipped spark plugs feature an erosion-resistant fine-wire center electrode, drastically reducing required firing voltage and delivering an intense, concentrated flame kernel for clean burn cycles under heavy throttle.

Technical Specifications

Compatibility

• 1998-2003 Ford F-150 (XL, XLT) 4.2L V6
• 2004 Ford F-150 Heritage 4.2L V6
• 2004-2008 Ford F-150 (XL, STX, XLT) 4.2L V6

Frequently Asked Questions

Does this fit the PN96 and P221 F-150?
Yes, this is a direct fit for the 1998-2008 Ford F-150 equipped with the Essex 4.2L engine.

Do these iridium spark plugs require manual gapping before installation?
Plugs arrive pre-gapped to factory specifications, though confirming electrode clearance with a wire-type gauge prior to threading into the aluminum heads is standard practice.

The Ford Workhorse Standard

Built to handle rigorous payload demands, high-ambient heat cycles, and severe-duty towing, this ignition kit provides clean, sustained arc transfer to keep your truck running reliably under demanding working conditions.