{"product_id":"ignition-coil-and-iridium-spark-plugs-for-lincoln-navigator-1998-1999-5-4l","title":"Ignition Coil and Iridium Spark Plugs for Lincoln Navigator (1998-1999) 5.4L","description":"\u003ch2\u003eDirect-Replacement Ignition Coil and Iridium Spark Plug Kit for 1998-1999 Lincoln Navigator\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat it Does:\u003c\/strong\u003e Restores factory ignition performance and delivers reliable spark energy across all 8 cylinders by replacing worn coil-on-plug packs and degraded plugs with high-dielectric assemblies and fine-wire iridium plugs.\u003c\/p\u003e\n\n\u003ch3\u003eThe Stock Navigator Ignition Degradation\u003c\/h3\u003e\n\u003cp\u003eThe first-generation Navigator's 5.4L Modular V8 relies on individual coil-on-plug (COP) units mounted deep within the cylinder head wells. Over time, persistent thermal cycling and underhood heat soak degrade the factory epoxy potting and internal copper windings, resulting in high internal resistance and micro-cracking in the secondary insulation. This causes high-voltage tracking, weak arc energy, intermittent misfires under heavy throttle load, rough idling, and catalytic converter damage from unburned fuel.\u003c\/p\u003e\n\n\u003ch3\u003eThe Engineering Solution\u003c\/h3\u003e\n\u003cp\u003eThis direct-fit kit pairs 8 heavy-duty coil-on-plug assemblies with 8 fine-wire iridium spark plugs to re-establish complete combustion. The coils feature premium high-conductivity copper windings, heat-resistant silicone boots, and corrosion-resistant blade terminals designed to withstand engine-bay heat without voltage drop. Matched with fine-wire iridium spark plugs that require lower firing voltage, this set ensures sustained spark stability, smoother cold starts, and consistent torque output under towing conditions.\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;\"\u003e1998-1999 Lincoln Navigator\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;\"\u003e5.4L Modular V8 \/ UN173 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;\"\u003e230-300 hp \/ 325-355 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, DG491, FD503, DCE261, DCE263, DG481, FD493\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eCompatibility\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e1998 Lincoln Navigator Base 5.4L V8 (SOHC 2V Modular)\u003c\/li\u003e\n  \u003cli\u003e1999 Lincoln Navigator Base 5.4L V8 (SOHC 2V \/ DOHC 4V InTech Modular)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eThe Lincoln Durability Standard\u003c\/h3\u003e\n\u003cp\u003eEngineered for full-size luxury SUVs tasked with heavy passenger hauling and severe-duty towing, this ignition package delivers the rugged electrical reliability required to eliminate misfire codes and maintain maximum towing torque.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":50448499474680,"sku":"DS-EE8MHFFRE","price":89.95,"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-lincoln-navigator-1998-1999-5-4l-1.jpg?v=1788647625","url":"https:\/\/performancechiptuning.com\/fr\/products\/ignition-coil-and-iridium-spark-plugs-for-lincoln-navigator-1998-1999-5-4l","provider":"Performance Chip Tuning","version":"1.0","type":"link"}