{"product_id":"ignition-coil-and-iridium-spark-plugs-for-jaguar-xk8-1999-2002-4-0l","title":"Ignition Coil and Iridium Spark Plugs for Jaguar XK8 (1999-2002) 4.0L","description":"\u003ch2\u003eDirect-Fit Ignition Coil and Iridium Spark Plug Service Kit for 1999-2002 Jaguar XK8\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat it Does:\u003c\/strong\u003e Restores factory ignition energy and precise combustion timing across all 8 cylinders by replacing degraded OEM coils and fouled spark plugs.\u003c\/p\u003e\n\n\u003ch3\u003eThe Stock XK8 Thermal Degradation Problem\u003c\/h3\u003e\n\u003cp\u003eThe 4.0L AJ-V8 engine bay experiences substantial thermal soak within the enclosed spark plug wells. Over time, the factory coil packs suffer internal dielectric breakdown as continuous heat cycling degrades the primary and secondary copper windings. This leads to micro-arcing, intermittent secondary voltage dropouts, rough cold idling, engine misfire codes (P0300-P0308), and premature fouling of traditional spark plug electrodes under sustained load.\u003c\/p\u003e\n\n\u003ch3\u003eThe Engineering Solution\u003c\/h3\u003e\n\u003cp\u003eThis complete 8-cylinder ignition kit addresses thermal fatigue by utilizing premium high-density copper windings insulated with high-grade epoxy resin to withstand extreme cylinder head temperatures. The direct-fit blade terminal connectors maintain solid electrical contact without signal noise, while the matched fine-wire iridium spark plugs provide superior spark stability, high thermal conductivity, and lower required firing voltage for consistent, complete fuel burn across the entire RPM band.\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;\"\u003e1999-2002 Jaguar XK8 4.0L V8\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;\"\u003eAJ27 \/ X100\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;\"\u003e290 hp \/ 290 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;\"\u003eUF415, LNE1510AB, XW9312029AB, C1323, 5C1180\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eCompatibility\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e1999 Jaguar XK8 Base Coupe 4.0L V8 (AJ27)\u003c\/li\u003e\n  \u003cli\u003e1999 Jaguar XK8 Base Convertible 4.0L V8 (AJ27)\u003c\/li\u003e\n  \u003cli\u003e2000 Jaguar XK8 Base Coupe 4.0L V8 (AJ27)\u003c\/li\u003e\n  \u003cli\u003e2000 Jaguar XK8 Base Convertible 4.0L V8 (AJ27)\u003c\/li\u003e\n  \u003cli\u003e2001 Jaguar XK8 Base Coupe 4.0L V8 (AJ27)\u003c\/li\u003e\n  \u003cli\u003e2001 Jaguar XK8 Base Convertible 4.0L V8 (AJ27)\u003c\/li\u003e\n  \u003cli\u003e2002 Jaguar XK8 Base Coupe 4.0L V8 (AJ27)\u003c\/li\u003e\n  \u003cli\u003e2002 Jaguar XK8 Base Convertible 4.0L V8 (AJ27)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eThe Jaguar Precision Standard\u003c\/h3\u003e\n\u003cp\u003eEngineered to meet strict European engine management parameters, this direct-replacement assembly prevents check engine lights and guarantees OE-level signal communication with the Jaguar powertrain control module.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":50447747711224,"sku":"DS-ESYWSE47N","price":175.95,"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-xk8-1999-2002-4-0l-1.jpg?v=1788622926","url":"https:\/\/performancechiptuning.com\/fr\/products\/ignition-coil-and-iridium-spark-plugs-for-jaguar-xk8-1999-2002-4-0l","provider":"Performance Chip Tuning","version":"1.0","type":"link"}