{"product_id":"ignition-coil-spark-plugs-for-infiniti-fx45-2003-2008-4-5l","title":"Ignition Coil + Spark Plugs for Infiniti FX45 (2003-2008) 4.5L","description":"\u003ch2 style=\"font-size: clamp(18px, 3vw, 21px); margin-bottom: 15px; line-height: 1.3;\"\u003eDirect-Fit Ignition Coil and Spark Plug Tune-Up Kit for 2003-2008 Infiniti FX45 4.5L (S50 \/ VK45DE)\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat it Does:\u003c\/strong\u003e The ignition coil and spark plug service kit restores factory combustion efficiency, eliminates cylinder misfires, and stabilizes idle on the 2003-2008 Infiniti FX45.\u003c\/p\u003e\n\n\u003ch3\u003eThe Stock Infiniti FX45 Secondary Ignition Breakdown\u003c\/h3\u003e\n\u003cp\u003eThe \u003cstrong\u003eVK45DE\u003c\/strong\u003e V8 engine bay in the \u003cstrong\u003eS50\u003c\/strong\u003e chassis generates significant thermal loads due to tight engine packaging and dense under-hood heat soak. Over mileage and continuous heat cycles, factory coil pack boots harden, develop microscopic dielectric fissures, and leak primary voltage to the aluminum cylinder head rather than the plug gap. Simultaneously, fine-wire spark plugs experience electrode erosion, widening gap clearance beyond standard factory tolerance. This increased electrical resistance forces aged coils to operate at saturated dwell times, leading to internal primary\/secondary winding failure, erratic misfire codes (P0300 through P0308), degraded fuel trim corrections, and sluggish throttle response.\u003c\/p\u003e\n\n\u003ch3\u003eThe Engineering Solution\u003c\/h3\u003e\n\u003cp\u003eThis comprehensive service pack pairs eight direct-fit coil-on-plug units with matched application-specific spark plugs to overhaul the primary ignition circuit. Built with high-dielectric epoxy potting and heat-resistant silicone boots, these coils isolate high-voltage discharge and resist dielectric punch-through under high thermal degradation. Matched high-durability center electrodes resist spark erosion to maintain a stable arc gap across varying cylinder pressures. Swapping plugs and coils concurrently restores precise burn duration, protects catalytic converters from unburned hydrocarbons, and renews crisp throttle tip-in across the powerband.\u003c\/p\u003e\n\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cdiv style=\"overflow-x: auto; margin-bottom: 20px;\"\u003e\n  \u003ctable width=\"100%\" style=\"border-collapse: collapse; border: 1px solid #e0e0e0; font-size: 14px; min-width: 300px;\"\u003e\n    \u003ctr style=\"background-color: #f9f9f9;\"\u003e\n\u003cth style=\"padding:10px; text-align: left; border: 1px solid #e0e0e0;\"\u003eFitment\u003c\/th\u003e\n\u003ctd style=\"padding:10px; border: 1px solid #e0e0e0;\"\u003e2003-2008 Infiniti FX45\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth style=\"padding:10px; text-align: left; border: 1px solid #e0e0e0;\"\u003eEngine \/ Chassis\u003c\/th\u003e\n\u003ctd style=\"padding:10px; border: 1px solid #e0e0e0;\"\u003e\n\u003cstrong\u003eVK45DE\u003c\/strong\u003e \/ \u003cstrong\u003eS50\u003c\/strong\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background-color: #f9f9f9;\"\u003e\n\u003cth style=\"padding:10px; text-align: left; border: 1px solid #e0e0e0;\"\u003eStock Output\u003c\/th\u003e\n\u003ctd style=\"padding:10px; border: 1px solid #e0e0e0;\"\u003e315 hp \/ 329 lb-ft\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth style=\"padding:10px; text-align: left; border: 1px solid #e0e0e0;\"\u003eReplaces OEM Part #\u003c\/th\u003e\n\u003ctd style=\"padding:10px; border: 1px solid #e0e0e0;\"\u003e\n\u003cstrong\u003eUF482\u003c\/strong\u003e, \u003cstrong\u003e5C1407\u003c\/strong\u003e, \u003cstrong\u003eE1068\u003c\/strong\u003e, \u003cstrong\u003eE962\u003c\/strong\u003e, \u003cstrong\u003e52-1757\u003c\/strong\u003e, \u003cstrong\u003eIC562\u003c\/strong\u003e, \u003cstrong\u003e22058\u003c\/strong\u003e, \u003cstrong\u003e33ICPA741\u003c\/strong\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003ch3\u003eCompatibility\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e2003 Infiniti FX45 Base 4.5L V8 (VK45DE \/ S50)\u003c\/li\u003e\n  \u003cli\u003e2004 Infiniti FX45 Base 4.5L V8 (VK45DE \/ S50)\u003c\/li\u003e\n  \u003cli\u003e2005 Infiniti FX45 Base 4.5L V8 (VK45DE \/ S50)\u003c\/li\u003e\n  \u003cli\u003e2006 Infiniti FX45 Base 4.5L V8 (VK45DE \/ S50)\u003c\/li\u003e\n  \u003cli\u003e2007 Infiniti FX45 Base 4.5L V8 (VK45DE \/ S50)\u003c\/li\u003e\n  \u003cli\u003e2008 Infiniti FX45 Base 4.5L V8 (VK45DE \/ S50)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eDoes this fit the S50 FX45?\u003c\/strong\u003e\u003cbr\u003e Yes, this is a direct fit for the 2003-2008 Infiniti FX45 equipped with the \u003cstrong\u003eVK45DE\u003c\/strong\u003e engine.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs an ECU reset or tune required after installation?\u003c\/strong\u003e\u003cbr\u003e No ECU tune is needed, though clearing stored DTC misfire codes and resetting fuel trims via OBD-II allows the ECU to adapt quickly to renewed ignition efficiency.\u003c\/p\u003e\n\n\u003ch3\u003eThe Infiniti Performance Standard\u003c\/h3\u003e\n\u003cp\u003ePreserve the aggressive, high-revving character and signature exhaust note of your performance crossover by keeping the 32-valve V8 firing on all eight cylinders with uncompromising electrical integrity.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":50625818624248,"sku":"DS-EUJZHKI91","price":209.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0800\/1290\/2648\/files\/ignition-coil-spark-plugs-for-infiniti-fx45-2003-2008-4-5l-1.jpg?v=1790351832","url":"https:\/\/performancechiptuning.com\/fr\/products\/ignition-coil-spark-plugs-for-infiniti-fx45-2003-2008-4-5l","provider":"Performance Chip Tuning","version":"1.0","type":"link"}