{"product_id":"ignition-coil-and-iridium-spark-plugs-for-cadillac-xlr-2004-2009-4-6l","title":"Ignition Coil and Iridium Spark Plugs for Cadillac XLR (2004-2009) 4.6L","description":"\u003ch2\u003eDirect-Fit Ignition Coil and Iridium Spark Plug Service Kit for 2004-2009 Cadillac XLR\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eRestores Peak Combustion Efficiency:\u003c\/strong\u003e This comprehensive 8-cylinder ignition tune-up kit replaces deteriorating factory coil-on-plug packs and worn spark plugs to eliminate misfires, hard cold starts, and secondary ignition breakdown under load.\u003c\/p\u003e\n\n\u003ch3\u003eThe Stock XLR Secondary Ignition Breakdown\u003c\/h3\u003e\n\u003cp\u003eThe 4.6L Northstar DOHC V8 engine bay generates substantial thermal cycling, which degrades factory coil-on-plug epoxy potting and interior secondary copper windings over time. This thermal fatigue causes insulation breakdown, micro-arcing, and high-voltage leakage, manifesting as cylinder misfires (P0300-P0308), erratic idling, and reduced throttle response. Simultaneously, standard factory plugs suffer from electrode gap erosion, requiring higher secondary voltage that accelerates coil failure.\u003c\/p\u003e\n\n\u003ch3\u003eThe Engineering Solution\u003c\/h3\u003e\n\u003cp\u003eThis direct-replacement kit pairs eight high-dielectric coil-on-plug assemblies with eight fine-wire iridium spark plugs. The ignition coils feature premium internal copper windings and reinforced thermoplastic housings designed to withstand elevated underhood operating temperatures without dielectric puncture. Paired with high-melting-point iridium core electrodes, this kit ensures consistent arc delivery, reduced quench effect, and complete fuel atomization across the entire rev range.\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;\"\u003e2004-2009 Cadillac XLR\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;\"\u003e4.6L Northstar LH2 V8 \/ Y-Body\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;\"\u003e320 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;\"\u003eUF564, 12597745, 12602862, 12670154, D596A, C1556\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eCompatibility\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e2004 Cadillac XLR Base 4.6L V8 (Northstar LH2)\u003c\/li\u003e\n  \u003cli\u003e2005 Cadillac XLR Base 4.6L V8 (Northstar LH2)\u003c\/li\u003e\n  \u003cli\u003e2006 Cadillac XLR Base 4.6L V8 (Northstar LH2)\u003c\/li\u003e\n  \u003cli\u003e2007 Cadillac XLR Base 4.6L V8 (Northstar LH2)\u003c\/li\u003e\n  \u003cli\u003e2008 Cadillac XLR Base \/ Platinum 4.6L V8 (Northstar LH2)\u003c\/li\u003e\n  \u003cli\u003e2009 Cadillac XLR Platinum 4.6L V8 (Northstar LH2)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eThe Cadillac Precision Standard\u003c\/h3\u003e\n\u003cp\u003eEngineered to meet factory electrical tolerances, this ignition set preserves the seamless power delivery, refined low-RPM cruise, and high-RPM responsiveness expected from GM's flagship roadster without triggering false check engine lights.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":50447751053560,"sku":"DS-E0OS8F1OJ","price":169.95,"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-cadillac-xlr-2004-2009-4-6l-1.jpg?v=1788623082","url":"https:\/\/performancechiptuning.com\/es\/products\/ignition-coil-and-iridium-spark-plugs-for-cadillac-xlr-2004-2009-4-6l","provider":"Performance Chip Tuning","version":"1.0","type":"link"}