{"product_id":"marsram-ignition-coil-pack-fd508-for-5-4l-v8-ford-f-150-expedition-direct-replacement-straight-black-boot","title":"Marsram Ignition Coil Pack FD508 for 5.4L V8 Ford F-150 \/ Expedition — Direct Replacement, Straight Black Boot","description":"\u003cstrong\u003eMarsram FD508 ignition coil pack is a direct-replacement ignition coil engineered to restore reliable spark to compatible 5.4L and select 4.6L Ford, Lincoln, and Mercury V8 engines.\u003c\/strong\u003e\n\n\u003cp\u003eThis ignition coil pack is built as a one-to-one replacement for FD508-style coils found on many mid-2000s Ford vehicles. It delivers consistent secondary voltage for each cylinder to help the engine fire smoothly and reduce misfires when matched to the correct engine type. Before purchasing, verify the coil’s black straight boot design and your vehicle’s engine size — this coil is not compatible with V10 engines or coils that use brown or curved boots.\u003c\/p\u003e\n\n\u003ch3\u003eHow do I know if the FD508 fits my truck or SUV?\u003c\/h3\u003e\n\u003cp\u003eFitment depends on engine displacement and the coil’s physical appearance. This FD508 is intended for 5.4L V8 engines on specific model years and some 4.6L V8 applications; it replaces numerous OEM numbers listed for the FD508 family. Always compare the connector, mounting points, and straight black boot style to your original coil before ordering.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eCompatible vehicles include 2004–2008 Ford F-150 5.4L V8 and 2005–2008 Expedition 5.4L V8.\u003c\/li\u003e\n  \u003cli\u003eAlso fits Lincoln Navigator, Mark LT, Ford Super Duty trucks, and select Mustang 5.4L V8s.\u003c\/li\u003e\n  \u003cli\u003eSome 2006–2008 Explorer and Mercury Mountaineer models with 4.6L V8 may use equivalent coils; confirm with parts finder.\u003c\/li\u003e\n  \u003cli\u003eNot compatible with V10 engines or coils featuring brown\/curved boots.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat symptoms indicate a failing ignition coil pack?\u003c\/h3\u003e\n\u003cp\u003eWorn coils commonly cause rough idling, intermittent misfires, or a loss of power during acceleration. The vehicle may illuminate the check engine light and store codes related to misfires (P030x). Replacing an aged coil with a correct FD508 unit can often clear those symptoms when they originate from ignition failure.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003ePersistent engine misfire codes (P0300–P0308) under load or at idle.\u003c\/li\u003e\n  \u003cli\u003eRough running, stalling, or hesitation during acceleration.\u003c\/li\u003e\n  \u003cli\u003eReduced fuel economy due to incomplete combustion.\u003c\/li\u003e\n  \u003cli\u003eVisible arcing or cracked coil boots on inspection.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow easy is installation and what tools are required?\u003c\/h3\u003e\n\u003cp\u003eInstallation is straightforward for anyone comfortable with basic automotive repairs. The coil mounts directly to the valve cover and plugs into the factory wiring harness; expect about 20–45 minutes for one coil depending on engine bay access. Use hand tools and follow torque specs to avoid over-tightening the mounting bolt.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eTools: ratchet, socket set, extension, and dielectric grease for boots.\u003c\/li\u003e\n  \u003cli\u003eDisconnect battery negative before starting to avoid shorts.\u003c\/li\u003e\n  \u003cli\u003eInspect spark plugs and wiring while the coil is removed; replace as needed.\u003c\/li\u003e\n  \u003cli\u003eConfirm straight black boot orientation and secure connector clips on reassembly.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat warranty and part numbers does this Marsram coil replace?\u003c\/h3\u003e\n\u003cp\u003eThe FD508 coil carries a 1-year warranty backed by Marsram quality testing. It replaces many OEM and aftermarket numbers in the FD508 family, simplifying cross-reference when sourcing parts for repairs.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eReplaces FD508 and related numbers like C1541, C1659, UF537, DG511 and others.\u003c\/li\u003e\n  \u003cli\u003eWarranty: 1-year limited coverage against manufacturing defects.\u003c\/li\u003e\n  \u003cli\u003eRecommended: use parts finder to confirm exact match for your VIN and engine.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for: This Marsram FD508 ignition coil pack is suited for owners and independent mechanics performing maintenance or repair on mid-2000s Ford, Lincoln, and Mercury V8 engines — especially 5.4L applications. Choose this unit if you need a cost-effective, warranty-backed replacement that matches OEM mounting and connector styles; avoid it if your vehicle uses V10 engines or coils with non-straight brown\/curved boots.\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: Will this FD508 fit a V10 engine?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: No. The Marsram FD508 is only compatible with specified V8 engines and not suitable for V10 applications.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: How long is the warranty for this ignition coil?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Marsram provides a 1-year warranty covering manufacturing defects for this FD508 ignition coil.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"Marsram","offers":[{"title":"Default Title","offer_id":48080941187230,"sku":"B09W2D71DZ","price":69.47,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0781\/2041\/9486\/files\/marsram-fd508-front-view.jpg?v=1785792976","url":"https:\/\/northtrailauto.ca\/products\/marsram-ignition-coil-pack-fd508-for-5-4l-v8-ford-f-150-expedition-direct-replacement-straight-black-boot","provider":"North Trail Auto","version":"1.0","type":"link"}