{"product_id":"ignition-coils-spark-plugs-for-mercury-grand-marquis-1998-2006-4-6l","title":"Ignition Coils \u0026 Spark Plugs for Mercury Grand Marquis (1998-2006) 4.6L","description":"\u003ch2\u003eUpgraded Ignition Coils \u0026amp; Spark Plugs for 1998-2006 Mercury Grand Marquis (4.6L Modular V8 \/ Panther)\u003c\/h2\u003e\n  \n  \u003cp\u003e\u003cstrong\u003eWhat it Does:\u003c\/strong\u003e This complete 8-pack ignition coil and spark plug kit replaces failing factory ignition components to eliminate misfires and restore optimal fuel combustion on the 4.6L Panther platform.\u003c\/p\u003e\n  \n  \u003ch3\u003eThe Stock Grand Marquis Ignition Shortcoming\u003c\/h3\u003e\n  \u003cp\u003eThe factory Ford\/Mercury ignition coils (commonly DG508) on the 4.6L 2-Valve Modular V8 are notorious for premature thermal degradation. Situated directly above the cylinder head, these Coil-on-Plug (COP) units endure extreme heat soak cycles. Over time, the internal epoxy potting compound breaks down, leading to microscopic cracks in the housing. Moisture intrusion combined with degraded primary winding resistance causes intermittent misfires, erratic idling, and compromised fuel combustion. Furthermore, using degraded spark plugs increases the electrical resistance gap, placing an excessive load on already weakening coil packs, severely reducing horsepower and fuel efficiency.\u003c\/p\u003e\n  \n  \u003ch3\u003eThe Engineering Solution\u003c\/h3\u003e\n  \u003cp\u003eThis comprehensive ignition overhaul directly addresses these thermal and electrical vulnerabilities. The upgraded ignition coils utilize high-temperature epoxy potting and reinforced PBT (Polybutylene Terephthalate) dielectric housings to resist heat cracking and moisture penetration under the hood of the Panther chassis. Internally, increased copper wire winding density boosts spark energy output compared to OEM specifications. When paired with the included performance spark plugs, the system ensures a highly concentrated, consistent spark kernel. This optimizes the air-fuel burn within the 4.6L cylinders, translating directly to restored horsepower, enhanced torque delivery, and a noticeably smoother idle, while preventing unburnt fuel from damaging the catalytic converters.\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;\"\u003e1998-2006 Mercury Grand Marquis\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;\"\u003e4.6L 2V Modular V8 \/ Panther Platform\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;\"\u003e200-239 hp \/ 275-287 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;\"\u003eDG508, FD503, C1417, 1L2Z12029AA, 140032\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/table\u003e\n \n  \u003ch3\u003eCompatibility\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003e1998 Mercury Grand Marquis 4.6L V8\u003c\/li\u003e\n    \u003cli\u003e1999 Mercury Grand Marquis 4.6L V8\u003c\/li\u003e\n    \u003cli\u003e2000 Mercury Grand Marquis 4.6L V8\u003c\/li\u003e\n    \u003cli\u003e2001 Mercury Grand Marquis 4.6L V8\u003c\/li\u003e\n    \u003cli\u003e2002 Mercury Grand Marquis 4.6L V8\u003c\/li\u003e\n    \u003cli\u003e2003 Mercury Grand Marquis 4.6L V8\u003c\/li\u003e\n    \u003cli\u003e2004 Mercury Grand Marquis 4.6L V8\u003c\/li\u003e\n    \u003cli\u003e2005 Mercury Grand Marquis 4.6L V8\u003c\/li\u003e\n    \u003cli\u003e2006 Mercury Grand Marquis 4.6L V8\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch3\u003eThe Mercury Panther Standard\u003c\/h3\u003e\n  \u003cp\u003eEngineered for maximum durability, these upgraded ignition components ensure your heavy-duty Grand Marquis maintains its legendary reliability and smooth cruising dynamics mile after mile.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":48244724072696,"sku":"DS-EJCX8B2US","price":129.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0800\/1290\/2648\/files\/ignition-coils-spark-plugs-for-mercury-grand-marquis-1998-2006-4-6l-1.jpg?v=1776272758","url":"https:\/\/performancechiptuning.com\/products\/ignition-coils-spark-plugs-for-mercury-grand-marquis-1998-2006-4-6l","provider":"Performance Chip Tuning","version":"1.0","type":"link"}