{"product_id":"ignition-coil-iridium-spark-plugs-wire-for-gmc-envoy-xl-2003-2004-5-3l","title":"Ignition Coil \u0026 Iridium Spark Plugs \u0026 Wire for GMC Envoy XL (2003-2004) 5.3L","description":"\u003ch2\u003eDirect-Fit High-Output Ignition Tune-Up Kit for 2003-2004 GMC Envoy\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat it Does:\u003c\/strong\u003e Replaces deteriorated factory coil packs, eroded spark plugs, and heat-degraded wires to resolve secondary ignition misfires, erratic idle, and unburnt fuel cycles under sustained load.\u003c\/p\u003e\n\n\u003ch3\u003eThe Stock Envoy Ignition Breakdown\u003c\/h3\u003e\n\u003cp\u003eThe factory ignition system on the GMT370 platform operates under intense thermal stress in an enclosed engine bay. Over extended service intervals, OEM coil potting develops microscopic fractures, inducing internal high-voltage dielectric breakdown and arcing during acceleration or towing. Concurrently, factory spark plug gaps erode, elevating electrical resistance and forcing tired coils to work harder, which rapidly degrades the factory secondary boots and triggers frequent P0300 random misfire codes.\u003c\/p\u003e\n\n\u003ch3\u003eThe Engineering Solution\u003c\/h3\u003e\n\u003cp\u003eThis comprehensive ignition service kit features D585\/UF262 round-body coil assemblies potted in high-grade dielectric epoxy with heavy-duty silicone boots to prevent voltage flashover. Matched with fine-wire iridium core spark plugs, the setup ensures sharp, stable flame-front propagation with minimal quenching. High-temp 8mm double-silicone plug wires with stranded copper cores and stainless heat-shielded terminals isolate conductors from exhaust manifold radiant heat, maintaining continuous spark delivery across all engine load zones.\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;\"\u003e2003-2004 GMC Envoy XL\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;\"\u003e5.3L Vortec V8 (LM4) \/ GMT370\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 \/ 325 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;\"\u003eUF262, D585, 41-962, 19299585\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\u003eVehicles:\u003c\/strong\u003e 2003-2004 GMC Envoy XL 5.3L V8 (Round coil-on-plug configuration only; not compatible with square UF271 coils)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCoil Interchange:\u003c\/strong\u003e UF262, D585, C1251, 10457730, 12563293, 12573190, 8104577300, 8125731900, GN10119, 5C1082, E254, E254P, 52-1647, IC413, 6737101, 19005218\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWire Interchange:\u003c\/strong\u003e 12192195, 9748GG, 748GG, 748UU, 12622553, 88862397, 12656210, XS10388, 12192192, 7873\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSpark Plug Interchange:\u003c\/strong\u003e 19299585, 41-962\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eThe GMC Towing \u0026amp; Durability Standard\u003c\/h3\u003e\n\u003cp\u003eEngineered to meet the thermal and electrical demands of Vortec truck and SUV platforms, this ignition system resists severe underhood heat soak during heavy trailering, restoring smooth throttle response and long-term powertrain reliability.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":50498310930680,"sku":"DS-ECU432RDY","price":185.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0800\/1290\/2648\/files\/ignition-coil-iridium-spark-plugs-wire-for-gmc-envoy-xl-2003-2004-5-3l-1.jpg?v=1789266177","url":"https:\/\/performancechiptuning.com\/fr\/products\/ignition-coil-iridium-spark-plugs-wire-for-gmc-envoy-xl-2003-2004-5-3l","provider":"Performance Chip Tuning","version":"1.0","type":"link"}