{"product_id":"marsram-ignition-coil-spark-plug-kit-for-5-4l-v8-fd508-style-8-coil-with-iridium-plugs","title":"Marsram Ignition Coil \u0026 Spark Plug Kit for 5.4L V8 — FD508-Style 8-Coil with Iridium Plugs","description":"\u003cp\u003e\u003cstrong\u003eMarsram's FD508 ignition coil and iridium spark plug kit replaces worn coils and plugs on 5.4L V8 Ford\/Lincoln engines to restore reliable spark, smoother idling, and consistent starting.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThis comprehensive aftermarket kit includes eight FD508-style ignition coils and eight high-performance iridium spark plugs designed for 5.4L V8 applications used across Ford F-150, Expedition, Navigator and select Super Duty models from the mid-2000s. Each coil uses durable epoxy and engineering-grade plastic on the exterior with high-conductivity copper windings inside. The spark plugs feature iridium center electrodes and corrosion-resistant materials to limit gap growth and sustain efficient combustion over time.\u003c\/p\u003e\n\n\u003ch3\u003eHow will this kit improve my 5.4L V8's starting and idle behavior?\u003c\/h3\u003e\n\u003cp\u003eReplacing degraded coils and plugs often cures hard starts, rough idle, and misfires caused by weak or inconsistent spark. Fresh coils restore higher-voltage delivery to the plugs while iridium electrodes maintain a stable spark, helping the engine fire evenly across all cylinders.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eIncludes 8 coils matched to FD508 appearance and electrical specs for V8 engines\u003c\/li\u003e\n  \u003cli\u003eIridium plugs resist electrode wear and reduce gap growth\u003c\/li\u003e\n  \u003cli\u003eImproves ignition consistency for smoother idle and crisper starts\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWill these parts fit my specific Ford or Lincoln model?\u003c\/h3\u003e\n\u003cp\u003eThe kit is built for 5.4L V8 engines with black straight coil boots only; it is not compatible with V10 engines or coils that have brown or curved boots. Verify the coil look on your vehicle against the FD508-style coil image or consult fitment charts before ordering.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eCommon fitment: 2005–2007 Ford F-150 5.4L V8 variants\u003c\/li\u003e\n  \u003cli\u003eAlso fits select 2004–2008 F-Series, 2005–2007 Expeditions and 2005–2007 Lincoln Navigators\/Mark LT\u003c\/li\u003e\n  \u003cli\u003eReplaces OEM numbers like DG511, FD508, 3L3Z-12029-BA, UF537 and related part numbers\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat materials and construction should I expect from the coils and plugs?\u003c\/h3\u003e\n\u003cp\u003eThe ignition coils use an epoxy-coated outer housing with high-strength engineering plastic to resist heat and deformation under engine bay conditions. Internally they feature high-conductivity copper windings for efficient energy transfer. The spark plugs use iridium center electrodes and corrosion-resistant designs to preserve gap integrity and stable spark formation over many miles.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eCoil shell: epoxy resin plus engineering plastic for heat resistance\u003c\/li\u003e\n  \u003cli\u003eInternal coil conductor: high-conductivity copper for faster ignition\u003c\/li\u003e\n  \u003cli\u003eSpark plug electrode: iridium for long life and stable spark gap\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow does the kit package and what warranty covers it?\u003c\/h3\u003e\n\u003cp\u003eThe kit ships with eight matched ignition coils and eight iridium spark plugs to replace a full-bank V8 set in one service. Marsram backs the kit with a one-year warranty and offers customer support for fitment or product concerns.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eComplete set: 8 coils + 8 spark plugs, ready for full V8 replacement\u003c\/li\u003e\n  \u003cli\u003e1-year limited warranty from Marsram with customer support\u003c\/li\u003e\n  \u003cli\u003eSold as an aftermarket direct-replacement kit — check fitment before installation\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for: This kit is aimed at owners or technicians working on mid-2000s Ford and Lincoln vehicles powered by the 5.4L V8 who need a full ignition bank refresh. It suits drivers experiencing misfires, rough idle, slow starts or decreased throttle response, and those performing scheduled maintenance who want durable coils and long-life iridium plugs. Verify your engine is the 5.4L V8 and that your vehicle uses black straight-boot coils before purchasing.\u003c\/p\u003e\n\u003csection class=\"product-faq-snippet\"\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Are these coils compatible with V10 engines?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: No. This FD508-style kit fits 5.4L V8 engines with black straight boots only, not V10 engines.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: What warranty covers the coil and spark plug kit?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Marsram includes a one-year warranty with the kit; contact customer support for warranty claims.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"Marsram","offers":[{"title":"Default Title","offer_id":67584869728441,"sku":"B0DZWRQ6VM","price":186.05,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0822\/3765\/3177\/files\/marsram-front-packaging-coils-plugs.jpg?v=1790457056","url":"https:\/\/redleafauto.ca\/products\/marsram-ignition-coil-spark-plug-kit-for-5-4l-v8-fd508-style-8-coil-with-iridium-plugs","provider":"Redleaf Auto","version":"1.0","type":"link"}