Ignition Coil and Iridium Spark Plugs for Lincoln Navigator (2015-2017) 3.5L

Direct-Fit Ignition Coil and Iridium Spark Plug Service Kit for 2015-2017 Lincoln Navigator

What it Does: Restores factory secondary ignition output and eliminates high-boost misfires across all six cylinders on the 3.5L EcoBoost platform.

The Stock Navigator Ignition Degradation

Under heavy towing loads and forced induction cylinder pressures, the factory ignition coil boots and internal windings on the 3.5L EcoBoost degrade rapidly from prolonged thermal cycling. Micro-cracking in the OEM epoxy insulation causes internal dielectric breakdown and severe carbon tracking along the spark plug insulator. This secondary voltage bleed results in spark blowout under boost, rough idle, reduced fuel economy, and persistent P0300–P0306 diagnostic trouble codes.

The Engineering Solution

This direct-replacement ignition service pack pairs six heavy-duty ignition coils featuring high-grade electrolytic copper windings and high-temperature dielectric epoxy with six fine-wire iridium spark plugs. The reinforced silicone spark plug boots insulate against extreme cylinder head heat soak, while the fine-point iridium center electrodes maintain precise gap tolerances and deliver a concentrated, reliable spark kernel for complete fuel combustion under maximum manifold pressure.

Technical Specifications

Compatibility

• 2015 Lincoln Navigator (Base, L) 3.5L V6 Twin-Turbo
• 2016 Lincoln Navigator (Base, L, Reserve, Select) 3.5L V6 Twin-Turbo
• 2017 Lincoln Navigator (Base, L, Reserve, Select) 3.5L V6 Twin-Turbo
• OEM Interchange: UF646, UF-646, DG549, BL3Z-12029-A, BL3Z-12029-B, BL3Z-12029-C, IC749, 5C1871

The Lincoln Heavy-Duty Capability Standard

Engineered to withstand heavy curb weights, sustained highway hauling, and high-load towing without spark deterioration or secondary ignition breakdown.