6 High Performance Ignition Coil for Ford Expedition (2015-2017) 3.5L Engine

Heavy-Duty Ignition Coil Pack for 2015-2017 Ford Expedition (EcoBoost / U324)

What it Does: Replaces failing factory coils to ensure a high-intensity spark and eliminate combustion instability under high-boost and heavy-load conditions.

The Stock Expedition Ignition Failure

The 3.5L EcoBoost engine in the U324 chassis generates significant internal heat due to its twin-turbocharged configuration. Stock OEM coils (UF646) frequently suffer from thermal degradation of the internal primary and secondary windings. As these components heat soak, the dielectric strength of the factory epoxy weakens, leading to internal shorting and carbon tracking. This manifests as a rhythmic 'stutter' or misfire during peak torque demands or while towing, where cylinder pressures are highest. Increased resistance in the stock coils can also lead to premature wear on the PCM’s ignition drivers as the system attempts to compensate for the weak spark energy.

The Engineering Solution

These high-performance coils are engineered with high-dielectric epoxy and reinforced silicone magnetic steel to withstand the extreme duty cycles of the 3.5L engine. By utilizing high-purity copper windings, these units provide improved thermal conductivity and lower electrical resistance, ensuring a consistent 30,000+ volt output. The boots are manufactured from high-temperature resistant silicone to prevent voltage leakage and arcing against the spark plug well. This specialized construction ensures that the spark can successfully bridge the gap even under high-boost pressures, preventing 'spark blowout' and restoring the 420 lb-ft of torque the EcoBoost is designed to produce.

Technical Specifications

Compatibility

• 2015 Ford Expedition 3.5L V6 (All Trims)
• 2016 Ford Expedition 3.5L V6 (All Trims)
• 2017 Ford Expedition 3.5L V6 (All Trims)

The Ford Truck Standard

Built for the rigors of heavy-duty hauling and long-distance towing, these coils prioritize thermal stability and moisture resistance. Ensuring your ignition system is up to spec is critical for maintaining the fuel economy and pulling power required for the U324 platform.

Common Questions

Will this ignition coil set fit my 2016 Ford Expedition?
Yes. This 6-pack is a direct fit for all 2015, 2016, and 2017 Ford Expedition trims equipped with the 3.5L EcoBoost V6 engine.

What is included in this package?
You get a complete set of 6 high-performance UF646 ignition coils with high-temperature silicone boots, enough to service all six cylinders on the 3.5L V6.

Will these coils fit a 2018 Ford Expedition?
This UF646 coil set is engineered specifically for the 2015-2017 Ford Expedition 3.5L EcoBoost V6 (U324 chassis). The 2018 U553 generation uses a different coil design (UF826 / DG-560).

What makes these coils hold up better under towing and boost?
They are built with high-purity copper windings, reinforced silicone magnetic steel, high-dielectric epoxy, and high-temp silicone boots to deliver a consistent 30,000+ volt output without thermal degradation or spark blowout.

Which factory part numbers does this coil pack replace?
These coils directly replace standard part number UF646, Motorcraft DG-549, and OEM BL3Z-12029-C on the 2015-2017 Expedition 3.5L EcoBoost.