Ignition Coil and Iridium Spark Plugs for Ford Explorer (1991-2005) 4.0L

Direct-Replacement Ignition Coil and Iridium Spark Plug Kit for 1991-2005 Ford Explorer

What it Does: Restores factory secondary ignition voltage and resolves secondary misfires by replacing thermal-fatigued coils and worn electrodes with high-dielectric coil assemblies and fine-wire iridium spark plugs.

The Stock Explorer Secondary Ignition Breakdown

The Ford 4.0L Cologne engine bay subjects ignition components to continuous thermal cycling and engine vibration. Over time, factory coil housings suffer micro-fractures in their epoxy encapsulation, allowing moisture intrusion and internal carbon tracking. Simultaneously, standard copper or nickel-core spark plugs experience gap erosion under load, drastically increasing required breakdown voltage. This elevated resistance strains aging primary windings, causing intermittent misfires, rough idle, reduced towing torque, and unburned hydrocarbon catalytic fouling.

The Engineering Solution

This direct-fit overhaul kit features six high-output ignition coils engineered with high-conductivity copper windings, reinforced thermoplastic PBT housings, and premium silicone boots to prevent voltage leakage. Paired with fine-wire iridium-tipped spark plugs, the system reduces the voltage required to bridge the gap while offering extreme resistance to electrical erosion and heat degradation under sustained load.

Technical Specifications

Compatibility

• 1991-2005 Ford Explorer 4.0L V6 (All Trims: Eddie Bauer, Limited, Sport, Sport Trac, XL, XLT, XLS)

The Ford Fleet-Grade Durability

Engineered to handle sustained utility duty, high-temperature trail crawling, and heavy payload demands, this ignition package delivers consistent high-kV output across the entire RPM band without spark blowout.