{"product_id":"ignition-coil-spark-plugs-for-jaguar-xk8-1997-1998-4-0l","title":"Ignition Coil + Spark Plugs for Jaguar XK8 (1997-1998) 4.0L","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 1997-1998 Jaguar XK8 (X100)\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat it Does:\u003c\/strong\u003e The ignition coil and platinum spark plug kit replaces aged, thermally stressed primary ignition components on the 1997-1998 Jaguar XK8 to eliminate misfires, stabilize idle, and restore combustion efficiency.\u003c\/p\u003e\n\n\u003ch3\u003eThe Stock Jaguar XK8 Ignition Breakdown\u003c\/h3\u003e\n\u003cp\u003eUnder-hood temperatures in the \u003cstrong\u003eX100\u003c\/strong\u003e engine bay subject coil packs to severe thermal cycling. Over time, the internal primary and secondary copper windings degrade, and the factory epoxy potting compound develops microscopic fractures. This insulation failure leads to internal dielectric breakdown, secondary voltage leakage, and unburned fuel entering the exhaust stream. Concurrently, factory plugs suffer from widened electrode gaps and carbon fouling, raising the ionization voltage demand beyond what weakened factory coils can discharge.\u003c\/p\u003e\n\n\u003ch3\u003eThe Engineering Solution\u003c\/h3\u003e\n\u003cp\u003eThis direct-replacement ignition service pack supplies eight application-specific coil-on-plug units engineered with high-temperature epoxy insulation and high-conductivity internal windings designed to resist dielectric fatigue. Paired with eight matched platinum-tipped spark plugs, the kit maintains a stable spark kernel under high-load, high-RPM cylinder pressures. Direct-fit electrical connectors match factory wiring harness pins to eliminate terminal resistance, preventing intermittent P0300 through P0308 diagnostic trouble codes and catalytic converter damage.\u003c\/p\u003e\n\n\u003ch3\u003eWhat's Included\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e8 Ignition Coils\u003c\/li\u003e\n  \u003cli\u003e8 Platinum Spark Plugs\u003c\/li\u003e\n\u003c\/ul\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: solid font-size: min-width:\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;\"\u003e1997-1998 Jaguar XK8\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\u003eAJ26\u003c\/strong\u003e 4.0L V8 \/ \u003cstrong\u003eX100\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;\"\u003e290 hp \/ 290 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\u003eUF347\u003c\/strong\u003e, \u003cstrong\u003eUF-347\u003c\/strong\u003e, \u003cstrong\u003e22058\u003c\/strong\u003e, \u003cstrong\u003eLCA1510AB\u003c\/strong\u003e, \u003cstrong\u003e88921407\u003c\/strong\u003e, \u003cstrong\u003eC1205\u003c\/strong\u003e, \u003cstrong\u003e5C1178\u003c\/strong\u003e, \u003cstrong\u003eC726\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\u003e1997 Jaguar XK8 Base 4.0L V8 (AJ26) Convertible \/ Coupe\u003c\/li\u003e\n  \u003cli\u003e1998 Jaguar XK8 Base 4.0L V8 (AJ26) Convertible \/ Coupe\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eFrequently Asked Questions \u0026amp; Fitment Warnings\u003c\/h3\u003e\n\u003ch4\u003eDoes this fit the X100 XK8?\u003c\/h4\u003e\n\u003cp\u003eYes, this is a direct fit for the 1997-1998 Jaguar XK8 equipped with the 4.0L \u003cstrong\u003eAJ26\u003c\/strong\u003e engine; confirm coil connector style before ordering, as it does not fit 1999+ AJ27 or supercharged XKR variants.\u003c\/p\u003e\n\n\u003ch4\u003eAre spark plug wires required for this installation?\u003c\/h4\u003e\n\u003cp\u003eNo, the 4.0L \u003cstrong\u003eAJ26\u003c\/strong\u003e uses an individual coil-on-plug setup where each coil mounts directly above its dedicated spark plug without secondary ignition leads.\u003c\/p\u003e\n\n\u003ch3\u003eThe Jaguar Standard\u003c\/h3\u003e\n\u003cp\u003eEuropean grand touring V8s require precise ignition timing and consistent secondary voltage delivery across all eight cylinders to prevent limp-mode engagement and preserve sensitive catalytic converters.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":67562435051768,"sku":"DS-EG602K7BG","price":174.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0800\/1290\/2648\/files\/ignition-coil-spark-plugs-for-jaguar-xk8-1997-1998-4-0l-1.jpg?v=1790981046","url":"https:\/\/performancechiptuning.com\/de\/products\/ignition-coil-spark-plugs-for-jaguar-xk8-1997-1998-4-0l","provider":"Performance Chip Tuning","version":"1.0","type":"link"}