Ignition Coil and Iridium Spark Plugs for Mercury Mariner (2005-2008) 2.3L

Direct-Fit Ignition Coil and Iridium Spark Plug Service Kit for 2005-2008 Mercury Mariner

Restores Factory Combustion Efficiency: This complete direct-replacement ignition kit replaces aging coil packs and fouled spark plugs to eliminate misfires, rough idle, and hesitation under load.

The Stock Mariner Ignition Breakdown

The 2.3L Duratec engine subjects top-mounted coil-on-plug boots to sustained cylinder head heat soak. Over mileage, OEM epoxy potting degrades and internal copper windings develop micro-fractures, inducing dielectric breakdown and spark scatter under cylinder load. Paired with eroded factory spark plug gaps, the increased secondary resistance forces coils to operate beyond their duty threshold, triggering DTC codes P0300 through P0304 and unburnt fuel waste.

The Engineering Solution

This package utilizes heavy-duty replacement ignition coils built with high-purity electrolytic copper primary and secondary windings, potted in high-dielectric epoxy to prevent high-voltage arcing. Matched with fine-wire iridium spark plugs, the assembly produces a focused, hotter flame kernel with significantly lower required ignition voltage. Direct-fit blade terminals ensure low-resistance connectivity and drop-in integration with factory wiring.

Technical Specifications

Compatibility

• 2005-2008 Mercury Mariner Base (2.3L L4 Gas)
• 2005-2007 Mercury Mariner Convenience (2.3L L4 Gas)
• 2005-2008 Mercury Mariner Premier (2.3L L4 Gas)

The Mercury Reliability Caliber

Built to handle heavy daily driving and all-weather commutes, this direct-plug ignition service kit restores consistent cold starting and peak throttle response without triggering fault codes or check engine lights.