{"product_id":"ignition-coil-and-iridium-spark-plugs-for-chevrolet-trailblazer-2002-2005-4-2l","title":"Ignition Coil and Iridium Spark Plugs for Chevrolet Trailblazer (2002-2005) 4.2L","description":"\u003ch2\u003eDirect-Fit Ignition Coil and Iridium Spark Plug Kit for 2002-2005 Chevrolet Trailblazer\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat it Does:\u003c\/strong\u003e Restores factory secondary ignition performance by replacing worn coil packs and degraded spark plugs to eliminate misfires, rough idle, and poor fuel economy under load.\u003c\/p\u003e\n\n\u003ch3\u003eThe Stock Trailblazer Ignition Breakdown\u003c\/h3\u003e\n\u003cp\u003eThe Atlas LL8 4.2L inline-six operates with high cylinder head temperatures that accelerate dielectric degradation in factory coil boots and internal insulation. Over time, thermal cycling causes micro-cracking in the OEM coil epoxy, allowing secondary voltage to arc to ground rather than jumping the plug gap. Combined with standard center electrode erosion, this increased resistance leads to intermittent misfires, sluggish throttle response, P0300-P0306 diagnostic trouble codes, and unburned hydrocarbon washdown in the catalytic converter.\u003c\/p\u003e\n\n\u003ch3\u003eThe Engineering Solution\u003c\/h3\u003e\n\u003cp\u003eThis comprehensive 6-cylinder tune-up kit features six direct-replacement coil packs wound with high-conductivity oxygen-free copper wire and sealed with high-dielectric epoxy to withstand extreme engine bay heat. Paired with six fine-wire iridium spark plugs, the system reduces ionization voltage requirements, resists electrode quenching, and ensures stable, high-energy spark delivery across the entire RPM band.\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 Chevrolet Trailblazer\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 \/ 277 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, UF-303, 12568062, 19300921, 8-12568-062-0, 5C1392, E255, IC414, 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 Chevrolet Trailblazer (LS, LT, LTZ, North Face) - 4.2L L6\u003c\/li\u003e\n  \u003cli\u003e2003 Chevrolet Trailblazer (LS, LT, LTZ, North Face) - 4.2L L6\u003c\/li\u003e\n  \u003cli\u003e2004 Chevrolet Trailblazer (LS, LT, North Face) - 4.2L L6\u003c\/li\u003e\n  \u003cli\u003e2005 Chevrolet Trailblazer (LS, LT) - 4.2L L6\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eThe Chevrolet Reliability Standard\u003c\/h3\u003e\n\u003cp\u003eBuilt for the daily demands of midsize SUV towing and hauling, these ignition components restore cylinder-to-cylinder combustion balance, ensuring dependable cold-weather starting, smoother low-RPM torque delivery, and reliable operation under heavy payload.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":50429877616888,"sku":"DS-EJUL4WGBK","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-chevrolet-trailblazer-2002-2005-4-2l-1.jpg?v=1788452541","url":"https:\/\/performancechiptuning.com\/products\/ignition-coil-and-iridium-spark-plugs-for-chevrolet-trailblazer-2002-2005-4-2l","provider":"Performance Chip Tuning","version":"1.0","type":"link"}