{"product_id":"bdfhyk-ignition-coil-and-iridium-spark-plug-kit-for-ford-v8-set-of-8-dg521-sp509-durable-coils-iridium-plugs","title":"BDFHYK Ignition Coil and Iridium Spark Plug Kit for Ford V8 — Set of 8 DG521 + SP509, Durable Coils \u0026 Iridium Plugs","description":"\u003cp\u003e\u003cstrong\u003eBDFHYK's set pairs eight DG521 ignition coils with SP509 iridium spark plugs to restore consistent spark and smoother running for compatible Ford and Lincoln V8 engines.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThis complete ignition pack replaces worn coil packs and spark plugs on many Ford models from 2008–2014, including the F‑150, F‑250\/F‑350 Super Duty, Expedition, Mustang, Lincoln Navigator and Mercury Mountaineer (see fit notes below). Each coil is built with silicon steel cores, Japan-imported rubber seals and varnished copper windings for improved durability; the SP509 plugs use an iridium electrode and high‑grade ceramic for reliable ignitability and long life. Before purchase, verify OE numbers and vehicle fitment against your VIN or factory part references.\u003c\/p\u003e\n\n\u003ch3\u003eWhich vehicles and OE numbers does this kit fit?\u003c\/h3\u003e\n\u003cp\u003eThe kit targets a range of Ford, Lincoln and Mercury models from late 2000s to early 2010s that use coil‑on‑plug ignition and iridium plugs. Compatibility depends on engine and production year, so cross‑check OE references to confirm fitment.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eCommon models: Ford F‑150 (2008–2010), F‑250\/F‑350 Super Duty (2008–2010), Expedition (2008–2014), Mustang (2008–2010), Lincoln Navigator (2008–2014), Mercury Mountaineer (2008–2010).\u003c\/li\u003e\n  \u003cli\u003eOE references to verify: DG521, FD509, 8L3Z‑12029‑A, 5C1716, IC697, SP509, PZNAR6A11H and others shown on the product detail page.\u003c\/li\u003e\n  \u003cli\u003eAlways match against your vehicle’s VIN or existing part numbers before installation.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow will replacing coils and plugs affect performance?\u003c\/h3\u003e\n\u003cp\u003eFresh coils and iridium plugs can improve ignition reliability, smoother idle, quicker starts and steadier throttle response—especially on engines past heavy mileage. They won’t change engine tuning but will restore lost spark efficiency caused by worn components.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eReduces misfires and rough idling when original parts are degraded.\u003c\/li\u003e\n  \u003cli\u003eImproves cold starts and throttle responsiveness.\u003c\/li\u003e\n  \u003cli\u003eIridium electrodes extend service intervals compared with standard plugs.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat are the construction and quality features of the components?\u003c\/h3\u003e\n\u003cp\u003eBDFHYK specifies durable materials and manufacturing choices to deliver a longer service life compared with basic replacements. Coils use quality steel cores and premium insulating materials; the spark plugs have an iridium center electrode and advanced ceramic insulator for stable spark delivery.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eCoils: silicon steel core, Japan-imported rubber seals, varnished copper windings.\u003c\/li\u003e\n  \u003cli\u003ePlugs: iridium electrode with unique ceramic insulator for thermal stability.\u003c\/li\u003e\n  \u003cli\u003ePackage includes a coil installation manual and OE cross‑reference list.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow should I check fitment and when is replacement recommended?\u003c\/h3\u003e\n\u003cp\u003eConfirm fit by matching the listed OE numbers and the vehicle year\/engine; photographic fit guides and part numbers are provided in the product listing. Consider replacement when the vehicle shows misfires, slow acceleration, rough idle or higher fuel use after long service intervals.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eCheck OE codes like DG521, FD‑509, SP509 against your existing parts.\u003c\/li\u003e\n  \u003cli\u003eConsider replacement after ~80,000 km or if symptoms appear (misfire, poor starts).\u003c\/li\u003e\n  \u003cli\u003eReplace coils and plugs as a paired set for consistent performance across cylinders.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for: this BDFHYK coil and plug set is for owners or technicians servicing Ford, Lincoln or Mercury V8 engines from the 2008–2014 model years who need a full‑bank ignition refresh. It’s suitable for people replacing aging ignition parts to restore drivability or prevent intermittent failures—provided you verify OE compatibility with your vehicle before ordering.\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: Do these coils and plugs fit my 2009 Ford F150 5.4L?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Possibly—confirm by comparing your vehicle’s OE numbers with DG521 and SP509 or check the product fitment images and your VIN.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Should I replace coils and plugs together?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes. Replacing both as a set ensures consistent spark performance across all cylinders and avoids mismatched wear.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"BDFHYK","offers":[{"title":"Default Title","offer_id":48081296359582,"sku":"B0CG8G3853","price":99.48,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0781\/2041\/9486\/files\/bdfhyk-front-packaging_592f9155-32f9-4113-b038-a15ee57a5fcc.jpg?v=1785798362","url":"https:\/\/northtrailauto.ca\/products\/bdfhyk-ignition-coil-and-iridium-spark-plug-kit-for-ford-v8-set-of-8-dg521-sp509-durable-coils-iridium-plugs","provider":"North Trail Auto","version":"1.0","type":"link"}