Ignition Coil and Iridium Spark Plugs for Mercury Grand Marquis (2007-2011) 4.6L

Direct-Replacement Ignition Coil and Iridium Spark Plug Service Kit for 2007-2011 Mercury Grand Marquis

Primary Function: Restores factory secondary ignition output, stabilizes idle voltage, and eliminates low-RPM misfire codes across the 4.6L Modular V8 platform.

The Stock Grand Marquis Ignition Breakdown

Aging factory coil-on-plug (COP) assemblies on the Ford Modular 2V platform routinely suffer from thermal degradation of the internal secondary copper windings and dielectric boot breakdown. Over extended heat cycles within the deep spark plug wells, high underhood temperatures cause micro-cracking in the OEM epoxy potting, inducing high-voltage flashover, carbon tracking, and intermittent misfires under load. Furthermore, standard factory plugs experience electrode erosion, widening spark gaps and forcing tired coils to exceed their breakdown voltage threshold.

The Engineering Solution

This complete ignition kit features eight heavy-duty coil-on-plug units engineered with high-grade internal copper windings and durable dielectric potting compound to isolate high voltage and prevent internal arcing. Paired with eight fine-wire iridium spark plugs, the system reduces the voltage required to bridge the gap while offering superior thermal conductivity and resistance to spark erosion. Direct-fit blade terminals and factory-matched electrical connectors ensure plug-and-play installation, providing crisp throttle response, steady combustion stability, and reliable cold starts.

Technical Specifications

Compatibility

• 2007 Mercury Grand Marquis 4.6L V8 (GS, LS)
• 2008 Mercury Grand Marquis 4.6L V8 (GS, LS)
• 2009 Mercury Grand Marquis 4.6L V8 (LS)
• 2010 Mercury Grand Marquis 4.6L V8 (LS)
• 2011 Mercury Grand Marquis 4.6L V8 (LS)

The Mercury Fleet-Proven Standard

Engineered to handle long highway cruising and heavy-duty fleet cycles, this kit delivers consistent high-kV energy distribution without trigger lag or premature dielectric breakdown under sustained thermal loads.