{"product_id":"ignition-coil-and-iridium-spark-plugs-for-cadillac-xlr-2006-2009-4-4l","title":"Ignition Coil and Iridium Spark Plugs for Cadillac XLR (2006-2009) 4.4L","description":"\u003ch2\u003eHigh-Dielectric Ignition Coil and Iridium Spark Plug Service Kit for 2006-2009 Cadillac XLR\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eDirect-fit 8-cylinder ignition overhaul kit:\u003c\/strong\u003e Restores high-rpm spark energy, eliminates boost-induced misfires, and stabilizes idle across supercharged Northstar applications.\u003c\/p\u003e\n\n\u003ch3\u003eThe Stock XLR-V Thermal Breakdown and Spark Blowout\u003c\/h3\u003e\n\u003cp\u003eThe supercharged 4.4L LC3 engine operates in a tightly packaged, high-heat engine bay that accelerates dielectric fatigue in factory ignition coil insulation. Over time, extreme thermal cycling degrades internal epoxy potting and secondary copper windings, producing micro-arcing and intermittent secondary circuit resistance. Coupled with eroded factory plug gaps under positive manifold pressure, this degradation leads to high-load spark blowout, hesitation, erratic idle stability, and diagnostic trouble codes such as P0300 through P0308.\u003c\/p\u003e\n\n\u003ch3\u003eThe Engineering Solution\u003c\/h3\u003e\n\u003cp\u003eThis comprehensive ignition pack pairs heavy-duty coil-on-plug assemblies with fine-wire iridium spark plugs to handle high cylinder pressures. The coils feature reinforced thermoplastic housings, high-purity copper primary and secondary windings, and high-temp silicone boots that isolate secondary voltages exceeding 35kV. The matched iridium plugs utilize a laser-welded fine-wire center electrode and high-alumina ceramic insulator, reducing required firing voltage, providing exceptional thermal conductivity, and guaranteeing sharp combustion timing under boost.\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;\"\u003e2006-2009 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;\"\u003e4.4L Supercharged LC3 V8 \/ GM 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;\"\u003e443 hp \/ 414 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, 12594176, 89017778, ITR4A15, 12597745\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eCompatibility\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003e2006 Cadillac XLR:\u003c\/strong\u003e 4.4L V8 Supercharged (LC3 \/ V-Series)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e2007 Cadillac XLR:\u003c\/strong\u003e 4.4L V8 Supercharged (LC3 \/ V-Series)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e2008 Cadillac XLR:\u003c\/strong\u003e 4.4L V8 Supercharged (LC3 \/ V-Series)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e2009 Cadillac XLR:\u003c\/strong\u003e 4.4L V8 Supercharged (LC3 \/ V-Series)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eThe Cadillac Precision Benchmark\u003c\/h3\u003e\n\u003cp\u003eEngineered to meet the tight tolerances of forced-induction luxury roadsters, this complete ignition refresh provides exact plug-and-play OE terminal alignment, instant throttle response, and consistent multi-strike combustion without triggering false misfire codes.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":50451866943736,"sku":"DS-EXBK28HMG","price":135.95,"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-2006-2009-4-4l-1.jpg?v=1788711857","url":"https:\/\/performancechiptuning.com\/fr\/products\/ignition-coil-and-iridium-spark-plugs-for-cadillac-xlr-2006-2009-4-4l","provider":"Performance Chip Tuning","version":"1.0","type":"link"}