{"product_id":"ignition-coil-and-iridium-spark-plugs-for-gmc-envoy-2002-2005-4-2l","title":"Ignition Coil and Iridium Spark Plugs for GMC Envoy (2002-2005) 4.2L","description":"\u003ch2\u003eDirect-Replacement Ignition Kit for 2002-2005 GMC Envoy\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat it Does:\u003c\/strong\u003e Complete 6-cylinder ignition tune-up kit engineered to restore factory secondary spark voltage, stabilize idle quality, and eliminate engine misfires under load.\u003c\/p\u003e\n\n\u003ch3\u003eThe Stock Envoy Ignition Degradation\u003c\/h3\u003e\n\u003cp\u003eThe factory coil-on-plug packs on the GMT360 platform endure severe thermal cycling directly atop the deep spark plug wells of the 4.2L inline-six cylinder head. Over extended mileage, the original internal epoxy insulation deteriorates, leading to dielectric breakdown, intermittent spark flashover, and cylinder-specific misfire codes (P0300–P0306). Worn factory plugs experience ground electrode erosion, creating an excessively wide gap that overworks aged coils and causes stumbling under acceleration, rough idle, and decreased fuel efficiency.\u003c\/p\u003e\n\n\u003ch3\u003eThe Engineering Solution\u003c\/h3\u003e\n\u003cp\u003eThis direct-fit overhaul kit upgrades your ignition system with heavy-duty internal copper windings encased in reinforced, high-dielectric housings to withstand thermal saturation. Premium silicone boots seal tightly over the plug well to prevent moisture contamination and voltage leakage. Paired with fine-wire iridium spark plugs, the assembly produces a concentrated, high-intensity spark kernel for rapid flame propagation, restoring dependable cold-weather starting, crisper throttle response, and complete combustion across all cylinders.\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;\"\u003e2002-2005 GMC Envoy\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;\"\u003e4.2L Atlas LL8 (Vortec 4200) \/ GMT360\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;\"\u003e275 hp \/ 275 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;\"\u003eUF303, 12568062, 19300921, 5C1392, GN10114\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eCompatibility\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e2002 GMC Envoy (SLE, SLT) 4.2L L6\u003c\/li\u003e\n  \u003cli\u003e2003 GMC Envoy (SLE, SLT) 4.2L L6\u003c\/li\u003e\n  \u003cli\u003e2004 GMC Envoy (SLE, SLT) 4.2L L6\u003c\/li\u003e\n  \u003cli\u003e2005 GMC Envoy (SLE, SLT) 4.2L L6\u003c\/li\u003e\n  \u003cli\u003e2002-2005 GMC Envoy XL \/ XUV 4.2L L6\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eThe GMC Utility Standard\u003c\/h3\u003e\n\u003cp\u003eEngineered to meet the rigorous demands of daily hauling, trailering, and stop-and-go commuting, this ignition setup ensures consistent cylinder pressure and uncompromised low-end torque retention across the lifetime of your drivetrain.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":50429881319672,"sku":"DS-EYFJ1ADVJ","price":124.95,"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-2002-2005-4-2l-1.jpg?v=1788452576","url":"https:\/\/performancechiptuning.com\/es\/products\/ignition-coil-and-iridium-spark-plugs-for-gmc-envoy-2002-2005-4-2l","provider":"Performance Chip Tuning","version":"1.0","type":"link"}