{"product_id":"ignition-coil-and-iridium-spark-plugs-for-jaguar-s-type-2003-2008-4-2l","title":"Ignition Coil and Iridium Spark Plugs for Jaguar S-Type (2003-2008) 4.2L","description":"\u003ch2\u003eDirect-Replacement High-Dielectric Ignition Kit for 2003-2008 Jaguar S-Type\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003ePrimary Function:\u003c\/strong\u003e Restores factory spark energy and stabilizes combustion across all 8 cylinders by replacing worn coil-on-plug units and degraded spark plugs.\u003c\/p\u003e\n\n\u003ch3\u003eThe Stock S-Type Thermal Ignition Degradation\u003c\/h3\u003e\n\u003cp\u003eThe AJ-V8 engine bay packaging creates extreme thermal pockets around the cylinder heads. Over extended heat cycles, factory Jaguar coil boots suffer dielectric breakdown, and internal primary\/secondary winding insulations crack. This causes micro-arcing, intermittent misfires under load, rough idle, and unburned fuel entering the catalytic converters, triggering persistent P0300-series trouble codes.\u003c\/p\u003e\n\n\u003ch3\u003eThe Engineering Solution\u003c\/h3\u003e\n\u003cp\u003eThis comprehensive ignition service kit features eight high-output coil-on-plug assemblies engineered with high-conductivity copper windings and heat-resistant epoxy potting to resist thermal saturation and voltage leakage. Paired with eight fine-wire iridium spark plugs, this setup reduces ignition voltage demand, optimizes flame front propagation, and provides consistent high-RPM spark delivery with durable blade terminals and OEM-matched connectors.\u003c\/p\u003e\n\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ctable width=\"100%\" style=\"border-collapse: collapse; border: 1px solid #e0e0e0; font-size: 14px;\"\u003e\n  \u003ctr style=\"background-color: #f9f9f9;\"\u003e\n\u003ctd style=\"padding:8px;\"\u003e\u003cstrong\u003eFitment\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003e2003-2008 Jaguar S-Type\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd style=\"padding:8px;\"\u003e\u003cstrong\u003eEngine \/ Chassis\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003e4.2L AJ-V8 (AJ34) \/ X200\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr style=\"background-color: #f9f9f9;\"\u003e\n\u003ctd style=\"padding:8px;\"\u003e\u003cstrong\u003eStock Output\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003e300 hp \/ 310 lb-ft (Approx)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd style=\"padding:8px;\"\u003e\u003cstrong\u003ePart Number\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003eUF519, UF533, 6R8312A366AA, C1678, LR016999, AJ83415, 5C1735\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eCompatibility\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e2003-2008 Jaguar S-Type 4.2L V8 (Naturally Aspirated)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eThe Jaguar Precision Standard\u003c\/h3\u003e\n\u003cp\u003eEngineered to meet European diagnostic tolerances, this matched 8-cylinder ignition pack prevents check-engine lights, eliminates hesitation under throttle tip-in, and restores refined luxury cruiser drivability.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":50448276193528,"sku":"DS-ERLNZ2U8S","price":124.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0800\/1290\/2648\/files\/ignition-coil-and-iridium-spark-plugs-for-jaguar-s-type-2003-2008-4-2l-1.jpg?v=1788638155","url":"https:\/\/performancechiptuning.com\/products\/ignition-coil-and-iridium-spark-plugs-for-jaguar-s-type-2003-2008-4-2l","provider":"Performance Chip Tuning","version":"1.0","type":"link"}