Ignition Coil + Iridium Spark Plugs for Ford F-350 (2008-2010) 6.8L

Direct-Fit Heavy-Duty Ignition Kit for 2008-2010 Ford F-350

What it Does: The Ignition Coil and Iridium Spark Plug Kit replaces worn factory coil packs and degraded spark plugs on the 2008-2010 Ford F-350 to eliminate misfires, stabilize idle, and restore combustion efficiency under heavy towing loads.

The Stock Ford F-350 Coil Degradation and High-Load Misfires

On the heavy-duty P356 platform, the modular 6.8L Triton V10 3V operates in extreme thermal environments, especially under sustained towing and commercial duty cycles. Over time, persistent heat soak degrades the OEM coil epoxy encapsulation and internal primary/secondary copper windings. This leads to internal shorting, dielectric puncture, and secondary voltage breakdown, manifesting as random cylinder misfires (DTCs P0300 through P0310) and harsh acceleration shudder. Compounding this, worn spark plugs develop eroded ground electrodes, widening the gap and placing excessive electrical resistance on the aging coil drivers.

The Engineering Solution

This 10-cylinder service kit pairs direct-replacement coil-on-plug (COP) assemblies with fine-wire iridium spark plugs to permanently resolve high-load spark blowout. The coils are engineered with high-dielectric epoxy potting, high-conductivity internal windings, and heat-stabilized silicone boots that resist dielectric breakdown past 35,000 volts. Matched with fine-wire iridium core center electrodes, this package significantly lowers the required ionization voltage, ensuring instant flame kernel development and maximum thermal efficiency. Direct cross-compatibility replaces failure-prone OEM units including 8L3Z12029A and DG521 with zero harness modification.

Technical Specifications

Compatibility

• 2008 Ford F-350 Super Duty 6.8L V10 (XL, XLT, Lariat, King Ranch)
• 2009 Ford F-350 Super Duty 6.8L V10 (XL, XLT, Lariat, King Ranch, Cabela's)
• 2010 Ford F-350 Super Duty 6.8L V10 (XL, XLT, Lariat, King Ranch, Cabela's)

Frequently Asked Questions

Does this fit the P356 F-350?
Yes, this is a direct fit for the 2008-2010 Ford F-350 equipped with the 6.8L Triton V10 engine.

Do these coils accommodate the updated cylinder head spark plug design?
Yes, these coils feature the correct boot configuration and contact spring length specifically engineered for late-revision 3-valve heads utilizing 8L3Z12029A style boots.

The Ford Super Duty Standard

Built for commercial hauling and maximum payload duty, your Super Duty demands consistent spark delivery across all ten combustion chambers. Installing this matched coil and iridium plug kit restores baseline towing power, ensures rapid cold starts, and prevents load-induced misfires under severe working conditions.