{"product_id":"ignition-coil-and-iridium-spark-plugs-for-lincoln-navigator-2018-2021-3-5l","title":"Ignition Coil and Iridium Spark Plugs for Lincoln Navigator (2018-2021) 3.5L","description":"\u003ch2 style=\"font-size: clamp(18px, 3vw, 21px); margin-bottom: 15px; line-height: 1.3;\"\u003eDirect-Fit Ignition Coil and Iridium Spark Plug Tune-Up Kit for 2018-2021 Lincoln Navigator (U554)\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat it Does:\u003c\/strong\u003e The ignition coil and iridium spark plug kit replaces aged factory ignition components on the 2018-2021 Lincoln Navigator to eliminate high-boost misfires, stabilize idle quality, and restore peak combustion efficiency.\u003c\/p\u003e\n\n\u003ch3\u003eThe Stock Lincoln Navigator Secondary Ignition Breakdown\u003c\/h3\u003e\n\u003cp\u003eUnder heavy throttle and high manifold boost pressures, the high-output \u003cstrong\u003eGen 2 3.5L EcoBoost D35\u003c\/strong\u003e engine demands excessive secondary ignition voltage to bridge plug gaps. Over time, thermal cycling degrades the factory coil-on-plug epoxy insulation and weakens the internal windings, leading to internal voltage arcing and spark blow-out. Worn standard or degraded electrodes widen the spark gap, forcing the factory coil pack past its dielectric breakdown threshold. This results in intermittent cylinder misfires, unburnt fuel washing down cylinder walls, rough idling, diagnostic trouble codes (P0300-P0306), and sluggish throttle response while towing or accelerating under load.\u003c\/p\u003e\n\n\u003ch3\u003eThe Engineering Solution\u003c\/h3\u003e\n\u003cp\u003eThis refresh kit pairs high-dielectric coil-on-plug units with fine-wire iridium spark plugs specifically engineered to resist spark quench in forced-induction environments. The ignition coils utilize vacuum-impregnated, heat-resistant epoxy-filled housings to insulate internal windings against heat-induced voltage leakage, paired with durable fluorosilicone boots and a factory-matching 3-blade harness terminal. The complementary iridium spark plugs feature a laser-welded fine-wire center electrode, substantially lowering the necessary ignition voltage while resisting electrode erosion and maintaining a consistent gap across extreme thermal cycles. This ensures immediate spark propagation and complete flame front distribution in every combustion chamber.\u003c\/p\u003e\n\n\u003ch3\u003eWhat's Included\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e6 Black Direct-Fit Ignition Coils\u003c\/li\u003e\n  \u003cli\u003e6 Fine-Wire 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;\"\u003e2018-2021 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;\"\u003e3.5L EcoBoost Twin-Turbo V6 (Gen 2 D35) \/ U554\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;\"\u003e450 hp \/ 510 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;\"\u003eUF826, HL3Z-12029-A, HL3Z12029A, HU7E-12A402-AA, HU7E12A402AA, HL3E-12A366-AB, HL3E12A366AB, 5413015, 36-8330, 368330, E1326, DG-560, DG560, GN10892, IC933, IGNB10067, 5C2268, EBC1337, C-1108, IGC0215\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\u003e2018 Lincoln Navigator 3.5L V6 Twin Turbo (Base, Select, Reserve, Black Label, L)\u003c\/li\u003e\n  \u003cli\u003e2019 Lincoln Navigator 3.5L V6 Twin Turbo (Base, Select, Reserve, Black Label, L)\u003c\/li\u003e\n  \u003cli\u003e2020 Lincoln Navigator 3.5L V6 Twin Turbo (Base, Reserve, Black Label, L)\u003c\/li\u003e\n  \u003cli\u003e2021 Lincoln Navigator 3.5L V6 Twin Turbo (Standard, Reserve, Black Label, L)\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 U554 Navigator?\u003c\/h4\u003e\n\u003cp\u003eYes, this is a direct fit for the fourth-generation 2018-2021 Lincoln Navigator equipped with the \u003cstrong\u003eGen 2 3.5L EcoBoost\u003c\/strong\u003e engine. \u003cstrong\u003eThis kit does not fit 2015-2017 first-generation 3.5L EcoBoost engines due to different coil dwell and mounting geometry.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003ch4\u003eShould dielectric grease be used during installation?\u003c\/h4\u003e\n\u003cp\u003eApplying a thin film of dielectric grease inside the spark plug boot tips prevents moisture intrusion, stops high-voltage flashover, and facilitates future boot removal from the ceramic insulators.\u003c\/p\u003e\n\n\u003ch3\u003eThe Lincoln Towing and Durability Standard\u003c\/h3\u003e\n\u003cp\u003eEngineered to handle sustained loads and heavy towing, this ignition refresh guarantees reliable spark delivery under the elevated cylinder pressures and thermal demands inherent to twin-turbocharged platforms.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":68083577716984,"sku":"DS-E1WHHNRVE","price":137.95,"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-2018-2021-3-5l-1.jpg?v=1794528384","url":"https:\/\/performancechiptuning.com\/de\/products\/ignition-coil-and-iridium-spark-plugs-for-lincoln-navigator-2018-2021-3-5l","provider":"Performance Chip Tuning","version":"1.0","type":"link"}