{"product_id":"ignition-coil-and-iridium-spark-plugs-for-mercury-mariner-2009-2011-2-5l","title":"Ignition Coil and Iridium Spark Plugs for Mercury Mariner (2009-2011) 2.5L","description":"\u003ch2\u003eDirect-Fit Ignition Coil and Iridium Spark Plug Service Kit for 2009-2011 Mercury Mariner\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat it Does:\u003c\/strong\u003e Replaces degraded factory coil-on-plug packs and worn spark plugs to eliminate secondary ignition breakdown, cylinder misfires, and erratic idle on the 2.5L Duratec engine.\u003c\/p\u003e\n\n\u003ch3\u003eThe Stock Mariner Ignition Breakdown\u003c\/h3\u003e\n\u003cp\u003eRepeated thermal cycling in the compact engine bay degrades the factory coil packs' internal epoxy insulation and copper windings, creating microscopic dielectric cracks. Over time, heat soak and standard electrode gap erosion increase electrical resistance across the secondary circuit, resulting in high-voltage leakage, hesitation under throttle load, poor fuel economy, and P0300-P0304 misfire diagnostic trouble codes.\u003c\/p\u003e\n\n\u003ch3\u003eThe Engineering Solution\u003c\/h3\u003e\n\u003cp\u003eThis complete tune-up kit restores factory ignition integrity using heavy-duty coil-on-plug assemblies engineered with high-conductivity copper windings, reinforced dielectric potting, and corrosion-resistant blade terminals. Paired with fine-wire iridium spark plugs designed for high thermal stability and minimal quench effect, the system ensures consistent high-energy spark delivery, clean flame-front propagation, and complete cylinder 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;\"\u003e2009-2011 Mercury Mariner\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;\"\u003eDuratec 25 (2.5L I4) \/ CD2\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;\"\u003e171 hp \/ 171 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;\"\u003eFD505, FD-505, UF621, UF-621\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 Mariner 2.5L L4 Gas\u003c\/li\u003e\n  \u003cli\u003e2010 Mercury Mariner 2.5L L4 Gas\u003c\/li\u003e\n  \u003cli\u003e2011 Mercury Mariner 2.5L L4 Gas\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eThe Mercury Reliability Standard\u003c\/h3\u003e\n\u003cp\u003eEngineered for dependable crossover duty, this direct-fit ignition kit ensures reliable cold-weather starts, balanced idle performance, and trouble-free operation without triggering false check engine lights.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":50452009812216,"sku":"DS-ELS9S15AK","price":74.95,"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-mariner-2009-2011-2-5l-1.jpg?v=1788716878","url":"https:\/\/performancechiptuning.com\/products\/ignition-coil-and-iridium-spark-plugs-for-mercury-mariner-2009-2011-2-5l","provider":"Performance Chip Tuning","version":"1.0","type":"link"}