{"product_id":"autoexact-ignition-coil-iridium-spark-plug-kit-for-ford-4-6-5-4l-8-coils-8-pre-gapped-plugs","title":"autoexact Ignition Coil \u0026 Iridium Spark Plug Kit for Ford 4.6\/5.4L — 8 Coils + 8 Pre‑gapped Plugs","description":"\u003cp\u003e\u003cstrong\u003eAutoexact FD504 ignition coil pack and iridium spark plug kit is an OEM-fit replacement set (8 coils + 8 plugs) designed to restore ignition performance for Ford 4.6L and 5.4L engines.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eIf your V8 is showing misfires, rough idle, poor throttle response, or an illuminated check engine light tied to ignition faults, this kit provides a complete plug-and-coil refresh in one purchase. The set pairs epoxy-potted coil packs built to OEM dimensions with fine-wire iridium plugs pre-gapped for quick installation, offering improved spark consistency and long service life compared with worn components.\u003c\/p\u003e\n\n\u003ch3\u003eHow will these coils and plugs affect engine performance?\u003c\/h3\u003e\n\u003cp\u003eReplacing degraded coils and spark plugs can restore lost power and smoother operation without engine modifications. The coil packs deliver steady high-voltage output while the iridium tips provide reliable ignition, helping reduce misfires and restore throttle feel.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eStronger, more consistent spark improves combustion efficiency.\u003c\/li\u003e\n  \u003cli\u003eReduces rough idle, hesitation, and vibration linked to misfires.\u003c\/li\u003e\n  \u003cli\u003eHelps resolve common P0300–P0308 diagnostic trouble codes.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eAre these parts an easy do-it-yourself swap?\u003c\/h3\u003e\n\u003cp\u003eYes — each coil and plug is engineered as a direct OEM replacement for compatible years and engines, so installation is typically plug-and-play with basic hand tools. Components come pre-greased and plugs are pre-gapped to the specified 1.3mm, streamlining the job for home mechanics.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eIncludes 8 ignition coil packs and 8 pre-gapped iridium plugs for a full-bank service.\u003c\/li\u003e\n  \u003cli\u003eFactory pre-lubricated with dielectric grease for proper seating and sealing.\u003c\/li\u003e\n  \u003cli\u003eRecommended torque: 11.06 ft·lb (15 N·m) for correct installation.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat durability and compatibility can I expect?\u003c\/h3\u003e\n\u003cp\u003eAutoexact uses epoxy-potted coils for heat resistance and long-term sealing performance, while the fine-wire iridium plugs are rated for extended life under normal driving. The kit matches many OE and replacement part numbers and fits a broad list of Ford, Mercury, and Lincoln models with 4.6L or 5.4L V8s.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003ePlugs typically last up to 40,000 miles under normal conditions.\u003c\/li\u003e\n  \u003cli\u003eCoils tested for voltage output, insulation, and sealing.\u003c\/li\u003e\n  \u003cli\u003eCompatible with many OEM numbers (FD504, DG508, F7TU12029BA, etc.) — verify fitment before purchase.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWill these plugs fit my vehicle’s heat range and thread specs?\u003c\/h3\u003e\n\u003cp\u003eThe included iridium plugs are engineered to replace heat range 5 or 6 equivalents (e.g., TR55GP or ITR6F13) that share identical physical specifications. They use a 14mm thread, tapered seat, and a 1.3mm preset gap, so they swap directly with the original equipment on applicable engines.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003e14mm thread and tapered seat match OEM dimensions.\u003c\/li\u003e\n  \u003cli\u003e1.3mm preset gap for correct spark timing without adjustment.\u003c\/li\u003e\n  \u003cli\u003e100% interchangeable between the two compatible heat ranges.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho this kit is for: drivers, fleet owners, and DIY mechanics who need a full ignition refresh for Ford 4.6L or 5.4L engines will benefit most. If your vehicle shows ignition-related drivability issues or you’re performing scheduled maintenance, this complete 8-coil\/8-plug set saves time and ensures matched components. Always confirm year, make, model, and engine before ordering to ensure proper fitment. The kit is backed by a 2-year warranty and lifetime technical support for installation assistance and peace of mind.\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: Does this kit fit my Ford 5.4L engine?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: This kit fits many Ford 5.4L models listed (e.g., F-150, E-Series, Expedition); verify year, make, model, and engine before purchase.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Are the spark plugs pre-gapped?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes, plugs arrive pre-gapped to 1.3mm and are ready for installation with the recommended torque of 11.06 ft·lb (15 N·m).\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"autoexact","offers":[{"title":"Default Title","offer_id":55169515094359,"sku":"B0G5Z4TPS7","price":93.93,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1050\/1524\/7191\/files\/autoexact-front-packaging-fd504.jpg?v=1790423078","url":"https:\/\/britishgarage.co.uk\/products\/autoexact-ignition-coil-iridium-spark-plug-kit-for-ford-4-6-5-4l-8-coils-8-pre-gapped-plugs","provider":"British Garage","version":"1.0","type":"link"}