{"product_id":"sykrss-ignition-coil-and-spark-plug-kit-for-ford-5-4l-4-6l-v8-8-dg508-style-coils-8-p479-iridium-plugs-pre-gapped","title":"SYKRSS Ignition Coil and Spark Plug Kit for Ford 5.4L\/4.6L V8 — 8 DG508-Style Coils + 8 P479 Iridium Plugs, Pre-Gapped","description":"\u003cp\u003e\u003cstrong\u003eComplete 8-coil and 8-spark-plug replacement kit engineered to restore ignition reliability for Ford 5.4L and 4.6L V8 engines.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eIf your Ford F-150, E-Series, Mustang, Crown Victoria, Lincoln Town Car, Mercury Grand Marquis or similar V8 is showing misfires, rough idle or reduced throttle response, this SYKRSS kit supplies all eight ignition coils (DG508-compatible) and eight pre-gapped P479 iridium spark plugs to replace the entire ignition bank in one service. The set is built to the correct OEM fitment and upgraded internally for greater heat, vibration and longevity performance compared with many aftermarket alternatives.\u003c\/p\u003e\n\n\u003ch3\u003eWill these coils and plugs fit my Ford 5.4L or 4.6L V8?\u003c\/h3\u003e\n\u003cp\u003eYes — the kit is designed as a direct-fit replacement for a wide range of Ford modular V8 applications without splicing or modification. It replaces common OE part numbers (DG508, 1L2Z12029AA, F7TU12A366AB and others) and matches factory mounting and electrical connectors.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eCovers Ford trucks, vans and SUVs with 5.4L\/4.6L V8 engines (F-150, F-250, F-350, E-Series, Expedition, Explorer, Mustang, Crown Victoria).\u003c\/li\u003e\n  \u003cli\u003eAlso fits Lincoln Town Car, Mercury Grand Marquis and Mountaineer and VPG MV-1 applications.\u003c\/li\u003e\n  \u003cli\u003ePre-gapped spark plugs at 0.054\" for immediate installation.\u003c\/li\u003e\n  \u003cli\u003eWe verify fitment: supply VIN or Year\/Make\/Model for a double-check before you install.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow do these parts handle heat, vibration and harsh driving conditions?\u003c\/h3\u003e\n\u003cp\u003eSYKRSS coils are upgraded internally for durability: windings use high-grade enameled copper and coils are potted in durable epoxy to resist under-hood stresses. Silicone boots and high-temp materials reduce failure from heat cycles and mechanical shock, helping the ignition system survive extended heavy towing or extreme climates.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eGerman-imported enameled copper wire for durable windings.\u003c\/li\u003e\n  \u003cli\u003eJapanese epoxy potting to resist vibration and moisture intrusion.\u003c\/li\u003e\n  \u003cli\u003eSilicone boots rated for peak under-hood temperatures to prevent cracking.\u003c\/li\u003e\n  \u003cli\u003eTested across wide temperature ranges for reliability in cold and heat.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhy choose iridium spark plugs (P479) with these coils?\u003c\/h3\u003e\n\u003cp\u003eThe P479 iridium plugs produce a concentrated spark with a fine electrode for more consistent ignition and longer service life than conventional plugs. Their ceramic insulator design reduces carbon tracking and helps maintain stable performance, which can lower misfire rates and preserve combustion efficiency across many miles.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eUltra-fine iridium tip for focused, reliable spark under load.\u003c\/li\u003e\n  \u003cli\u003eIsostatic ceramic insulator to limit flashover and fouling.\u003c\/li\u003e\n  \u003cli\u003eRated for extended service life—designed for 60,000+ miles in typical use.\u003c\/li\u003e\n  \u003cli\u003ePre-gapped to factory spec to avoid extra prep during install.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat installation steps and precautions should I follow?\u003c\/h3\u003e\n\u003cp\u003eInstallation is straightforward for a DIY mechanic or professional shop, but Ford modular heads use shallow aluminum spark plug threads that are vulnerable to over-torque. Use a torque wrench and tighten spark plugs to the manufacturer-recommended 25–30 N·m (about 22 ft-lbs) to avoid thread damage; replace all eight coils at once for consistent performance across cylinders.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eReplace all 8 coils and 8 plugs together to stop intermittent misfires.\u003c\/li\u003e\n  \u003cli\u003eTighten spark plugs to exactly 25–30 N·m (22 ft-lbs) to prevent stripped threads.\u003c\/li\u003e\n  \u003cli\u003eNo splicing or cutting required — direct-fit electrical connectors match OE harnesses.\u003c\/li\u003e\n  \u003cli\u003eIf uncertain, send VIN or Year\/Make\/Model for SYKRSS fitment confirmation before install.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho this kit is for: technicians, fleet managers and hands-on owners who want a full ignition-bank refresh for Ford 5.4L and 4.6L V8 vehicles. It’s ideal for trucks and vans that have spent many miles on original coils, vehicles experiencing misfires, or owners preparing a tow-heavy season. The kit pairs OEM-correct fit with internal upgrades and a one-year replacement promise, so you can replace all ignition components confidently and get back on the road with more consistent performance.\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 Ford 5.4L\/4.6L V8?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes. This kit is a direct-fit for many Ford 5.4L and 4.6L V8 models. Provide VIN for a fitment double-check.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: What torque should I use for the spark plugs?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Torque spark plugs to 25–30 N·m (about 22 ft-lbs). Over-tightening can strip the aluminum threads.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"SYKRSS","offers":[{"title":"Default Title","offer_id":67585695121593,"sku":"B0D41VJMP1","price":133.89,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0822\/3765\/3177\/files\/sykrss-front-box-packaging.jpg?v=1790475898","url":"https:\/\/redleafauto.ca\/products\/sykrss-ignition-coil-and-spark-plug-kit-for-ford-5-4l-4-6l-v8-8-dg508-style-coils-8-p479-iridium-plugs-pre-gapped","provider":"Redleaf Auto","version":"1.0","type":"link"}