{"product_id":"ignition-coil-and-iridium-spark-plugs-for-mercury-mountaineer-2009-2010-4-0l","title":"Ignition Coil and Iridium Spark Plugs for Mercury Mountaineer (2009-2010) 4.0L","description":"\u003ch2\u003eDirect-Fit Ignition Coil and Iridium Spark Plug Kit for 2009-2010 Mercury Mountaineer\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eRestores primary ignition energy and combustion efficiency:\u003c\/strong\u003e Complete ignition service kit designed to replace degraded factory coils and worn plugs, eliminating secondary voltage leakage, rough idle, and load-induced misfires.\u003c\/p\u003e\n\n\u003ch3\u003eThe Stock Mountaineer Thermal Breakdown and Voltage Leakage\u003c\/h3\u003e\n\u003cp\u003eThe factory ignition coils on the 4.0L Cologne SOHC engine are subjected to significant engine bay thermal cycling that degrades the internal epoxy encapsulation and copper winding insulation over time. This breakdown leads to internal shorting, weak spark output, and intermittent cylinder misfires under load. When paired with standard factory spark plugs experiencing widened electrode gaps and increased electrical resistance, the system demands excessive secondary voltage, degrading fuel economy and triggering diagnostic trouble codes.\u003c\/p\u003e\n\n\u003ch3\u003eThe Engineering Solution\u003c\/h3\u003e\n\u003cp\u003eThis kit restores factory ignition architecture using heavy-duty coil-on-plug assemblies engineered with high-conductivity copper windings, impact-resistant thermoplastic housings, and corrosion-resistant blade terminals. Combined with fine-wire iridium spark plugs, the system requires lower striking voltage while delivering a consistent, high-temperature flame kernel. The laser-welded iridium alloy resists thermal erosion and carbon fouling, ensuring crisp throttle response and complete fuel combustion under all operating loads.\u003c\/p\u003e\n\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ctable width=\"100%\" style=\"border-collapse: collapse; border: 1px solid #e0e0e0; font-size: 14px;\"\u003e\n  \u003ctr style=\"background-color: #f9f9f9;\"\u003e\n\u003ctd style=\"padding:8px;\"\u003e\u003cstrong\u003eFitment\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003e2009-2010 Mercury Mountaineer\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd style=\"padding:8px;\"\u003e\u003cstrong\u003eEngine \/ Chassis\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003e4.0L Cologne SOHC V6 \/ U251\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr style=\"background-color: #f9f9f9;\"\u003e\n\u003ctd style=\"padding:8px;\"\u003e\u003cstrong\u003eStock Output\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003e210 hp \/ 254 lb-ft (Approx)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd style=\"padding:8px;\"\u003e\u003cstrong\u003ePart Number\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003eUF406, FD502, DG500, UF-406\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eCompatibility\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e2009 Mercury Mountaineer 4.0L V6 (Base, Premier)\u003c\/li\u003e\n  \u003cli\u003e2010 Mercury Mountaineer 4.0L V6 (Base, Premier)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eThe Mercury Durability Standard\u003c\/h3\u003e\n\u003cp\u003eEngineered to withstand the demanding duty cycles of daily driving and heavy towing, this ignition kit delivers continuous dielectric strength and stable firing performance without ignition breakdown under sustained thermal stress.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":50452246397176,"sku":"DS-EANVDSDK8","price":71.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0800\/1290\/2648\/files\/ignition-coil-and-iridium-spark-plugs-for-mercury-mountaineer-2009-2010-4-0l-1.jpg?v=1788721357","url":"https:\/\/performancechiptuning.com\/fr\/products\/ignition-coil-and-iridium-spark-plugs-for-mercury-mountaineer-2009-2010-4-0l","provider":"Performance Chip Tuning","version":"1.0","type":"link"}