{"product_id":"ignition-coil-and-iridium-spark-plugs-for-gmc-envoy-xuv-2004-2005-4-2l","title":"Ignition Coil and Iridium Spark Plugs for GMC Envoy XUV (2004-2005) 4.2L","description":"\u003ch2\u003eDirect-Fit Ignition Coil and Iridium Spark Plug Kit for 2004-2005 GMC Envoy XUV\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat it Does:\u003c\/strong\u003e The ignition coil and iridium spark plug kit restores secondary ignition voltage and combustion efficiency on the 2004-2005 GMC Envoy XUV to eliminate misfires, stabilize idle, and recover lost engine power.\u003c\/p\u003e\n\n\u003ch3\u003eThe Stock GMC Envoy XUV Coil Breakdown and Voltage Leakage\u003c\/h3\u003e\n\u003cp\u003eFactory ignition coils on the \u003cstrong\u003eGMT360\u003c\/strong\u003e platform paired with the \u003cstrong\u003eLL8\u003c\/strong\u003e 4.2L inline-six are exposed to extreme thermal cycles within deep cylinder head wells. Over time, heat soak degrades the factory internal epoxy and silicone boots, creating dielectric breakdown, secondary voltage leaks, and spark blowout under load. Worn factory plugs increase electrode resistance, which overworks primary coil windings and precipitates erratic P0300 misfire codes, unburned fuel entering the catalytic converter, and noticeable hesitation during acceleration.\u003c\/p\u003e\n\n\u003ch3\u003eThe Engineering Solution\u003c\/h3\u003e\n\u003cp\u003eThis replacement ignition kit pairs high-dielectric insulated pencil coils with fine-wire iridium spark plugs to establish consistent spark duration and complete fuel burn. The coil packs feature high-grade magnetic copper windings encased in reinforced potting resin to resist thermal cracking and dielectric puncture. The matched iridium plugs utilize laser-welded center electrodes that require lower strike voltages, reducing electrical load across the circuit. Built to direct-fit interchange specifications \u003cstrong\u003eUF303\u003c\/strong\u003e and \u003cstrong\u003e68070492AB\u003c\/strong\u003e, this setup restores quick cold starts, precise combustion timing, and steady idle stability without harness modification.\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; margin-bottom: 20px;\"\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;\"\u003e2004-2005 GMC Envoy XUV\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;\"\u003eLL8 (Vortec 4200) \/ GMT360\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;\"\u003e275 hp \/ 275 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;\"\u003eUF303, 68070492AB, KIN119942TOP\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eCompatibility\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e2004 GMC Envoy XUV (4.2L I6 LL8)\u003c\/li\u003e\n  \u003cli\u003e2005 GMC Envoy XUV (4.2L I6 LL8)\u003c\/li\u003e\n  \u003cli\u003eFits SLE and SLT trim packages equipped with the 4.2L inline-six engine\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eDoes this fit the GMT360 Envoy XUV?\u003c\/strong\u003e\u003cbr\u003e Yes, this is a direct fit for the 2004-2005 GMC Envoy XUV equipped with the LL8 engine.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDo these iridium spark plugs require gapping before installation?\u003c\/strong\u003e\u003cbr\u003e These plugs arrive factory pre-gapped, though carefully checking the gap with a feeler gauge prior to torquing is standard practice.\u003c\/p\u003e\n\n\u003ch3\u003eThe GMC Utility Caliber\u003c\/h3\u003e\n\u003cp\u003eEngineered for the rigorous duty demands of heavy-payload utility vehicles, this ignition kit maintains reliable secondary spark energy during stop-and-go driving, loaded hauling, and steep grade climbing.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":50594271592696,"sku":"DS-E5Y1VVS5R","price":99.95,"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-gmc-envoy-xuv-2004-2005-4-2l-1.jpg?v=1790058603","url":"https:\/\/performancechiptuning.com\/fr\/products\/ignition-coil-and-iridium-spark-plugs-for-gmc-envoy-xuv-2004-2005-4-2l","provider":"Performance Chip Tuning","version":"1.0","type":"link"}