{"product_id":"ignition-coil-spark-plugs-for-lincoln-navigator-2000-2004-5-4l","title":"Ignition Coil + Spark Plugs for Lincoln Navigator (2000-2004) 5.4L","description":"\u003ch2 style=\"font-size: clamp(18px, 3vw, 21px); margin-bottom: 15px; line-height: 1.3;\"\u003eHigh-Output Ignition Coil and Iridium Spark Plug Kit for 2000-2004 Lincoln Navigator (UN173 \/ U228)\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat it Does:\u003c\/strong\u003e The ignition coil and iridium spark plug kit replaces worn factory ignition components on the 2000-2004 Lincoln Navigator to eliminate under-load misfires, restore combustion efficiency, and stabilize engine idle.\u003c\/p\u003e\n\n\u003ch3\u003eThe Stock Lincoln Navigator Ignition Breakdown\u003c\/h3\u003e\n\u003cp\u003eFactory coil-on-plug (COP) units in the \u003cstrong\u003e5.4L InTech DOHC V8\u003c\/strong\u003e are recessed deep within cylinder head wells, exposing them to extreme continuous heat soak and thermal cycling. Over time, the stock epoxy insulation develops micro-fractures and the rubber boots deteriorate, causing secondary voltage leakage, dielectric breakdown, and spark scatter. When paired with aged factory spark plugs exhibiting widened electrode gaps, the factory ignition system generates severe misfires, sluggish throttle response, and driveability hesitation under heavy towing loads.\u003c\/p\u003e\n\n\u003ch3\u003eThe Engineering Solution\u003c\/h3\u003e\n\u003cp\u003eThis complete ignition overhaul kit pairs heavy-duty coil packs with long-life \u003cstrong\u003eiridium spark plugs\u003c\/strong\u003e to restore peak secondary circuit output. The replacement coils feature high-permeability magnetic cores, high-purity copper windings, and high-temp dielectric potting designed to withstand thermal saturation. Matched with fine-wire iridium center electrodes, the system lowers required firing voltage, provides a consistent flame kernel, resists carbon fouling, and supports dependable combustion under high-cylinder-pressure conditions.\u003c\/p\u003e\n\n\u003ch3\u003eWhat's Included\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e8 Performance Ignition Coils\u003c\/li\u003e\n  \u003cli\u003e8 Iridium Spark Plugs\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cdiv style=\"overflow-x: auto; margin-bottom: 20px;\"\u003e\n  \u003ctable width=\"100%\" style=\"border-collapse: collapse; border: 1px solid #e0e0e0; font-size: 14px; min-width: 300px;\"\u003e\n    \u003ctr style=\"background-color: #f9f9f9;\"\u003e\n\u003cth style=\"padding:10px; text-align: left; border: 1px solid #e0e0e0;\"\u003eFitment\u003c\/th\u003e\n\u003ctd style=\"padding:10px; border: 1px solid #e0e0e0;\"\u003e2000-2004 Lincoln Navigator\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth style=\"padding:10px; text-align: left; border: 1px solid #e0e0e0;\"\u003eEngine \/ Chassis\u003c\/th\u003e\n\u003ctd style=\"padding:10px; border: 1px solid #e0e0e0;\"\u003e5.4L InTech DOHC V8 \/ UN173 \/ U228\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background-color: #f9f9f9;\"\u003e\n\u003cth style=\"padding:10px; text-align: left; border: 1px solid #e0e0e0;\"\u003eStock Output\u003c\/th\u003e\n\u003ctd style=\"padding:10px; border: 1px solid #e0e0e0;\"\u003e300 hp \/ 355 lb-ft\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth style=\"padding:10px; text-align: left; border: 1px solid #e0e0e0;\"\u003eReplaces OEM Part #\u003c\/th\u003e\n\u003ctd style=\"padding:10px; border: 1px solid #e0e0e0;\"\u003e1F3U12029AA, 2C6U12A366AC, 2C6Z12029AA, 4L7Z12029AB, D7LZ12029AD, F7LU12029AC, F7LU12A366AD, F7LU12A366CB, F7LU12A366CC, F7LZ12029AA, F7LZ12029AC, F7LZ12029AD, F7LZ12029CB, 140034, 140034-8, 140034B, 140034B-8, 140034K, 140034K-8, 230035251\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003ch3\u003eCompatibility\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e2000-2004 Lincoln Navigator 5.4L V8\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eFrequently Asked Questions \u0026amp; Fitment Warnings\u003c\/h3\u003e\n\u003ch4\u003eDoes this fit the UN173 \/ U228 Navigator?\u003c\/h4\u003e\n\u003cp\u003eYes, this is a direct fit for the 2000-2004 Lincoln Navigator equipped with the \u003cstrong\u003e5.4L InTech DOHC V8\u003c\/strong\u003e engine. \u003cstrong\u003eConfirm engine displacement and coil connector style prior to installation; not intended for universal or alternate engine applications.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003ch4\u003eDo I need to install new spark plug wires with this kit?\u003c\/h4\u003e\n\u003cp\u003eNo, this application uses a direct Coil-on-Plug (COP) configuration with one coil per cylinder, so traditional spark plug wires are not used.\u003c\/p\u003e\n\n\u003ch3\u003eThe Lincoln Durability Standard\u003c\/h3\u003e\n\u003cp\u003eEngineered to handle the demanding electrical loads of full-size towing and cross-country hauling, this ignition kit delivers reliable firing performance, balanced idle stability, and consistent torque output across all eight cylinders.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":67562628612344,"sku":"DS-ETSQTOKHU","price":110.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0800\/1290\/2648\/files\/ignition-coil-spark-plugs-for-lincoln-navigator-2000-2004-5-4l-1.jpg?v=1790987393","url":"https:\/\/performancechiptuning.com\/fr\/products\/ignition-coil-spark-plugs-for-lincoln-navigator-2000-2004-5-4l","provider":"Performance Chip Tuning","version":"1.0","type":"link"}