{"product_id":"ignition-coil-and-iridium-spark-plugs-for-chevrolet-trailblazer-2006-2009-4-2l","title":"Ignition Coil and Iridium Spark Plugs for Chevrolet Trailblazer (2006-2009) 4.2L","description":"\u003ch2\u003eDirect-Fit Ignition Coil and Iridium Spark Plug Service Kit for 2006-2009 Chevrolet Trailblazer\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat it Does:\u003c\/strong\u003e Replaces degraded factory coil packs and worn spark plugs with high-dielectric coil-on-plug assemblies and fine-wire iridium plugs to restore precise secondary ignition voltage and clean combustion.\u003c\/p\u003e\n\n\u003ch3\u003eThe Stock Trailblazer Secondary Voltage Breakdown\u003c\/h3\u003e\n\u003cp\u003eThe Atlas LL8 inline-six engine relies on individual coil-on-plug assemblies mounted in deep cylinder head wells. Over extended thermal cycles, the factory epoxy encapsulation develops microscopic dielectric breakdown, and the primary-to-secondary copper windings suffer thermal fatigue. This degradation leads to intermittent primary current resistance, high-RPM misfires (DTC P0300-P0306), unburnt hydrocarbon accumulation in the catalytic converter, and rough idle stabilization under load.\u003c\/p\u003e\n\n\u003ch3\u003eThe Engineering Solution\u003c\/h3\u003e\n\u003cp\u003eThis 6-cylinder refresh kit features reinforced ignition coils engineered with high-conductivity internal copper windings and high-grade thermal resin encapsulation to resist dielectric breakdown under extreme underhood heat soak. Paired with fine-wire iridium spark plugs, the assembly lowers required secondary voltage, ensures stable spark kernel propagation, and maintains exact electrode gap tolerances over severe duty cycles. Blade-style direct-fit terminals guarantee minimal contact resistance and zero-modification installation.\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 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;\"\u003e291 hp \/ 277 lb-ft\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd style=\"padding:8px;\"\u003e\u003cstrong\u003ePart Number \/ Interchange\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003eUF497, UF-497, 5C1615, D1935E, 1788471, CUF497, 12596547\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eCompatibility\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e2006-2009 Chevrolet Trailblazer LS 4.2L L6\u003c\/li\u003e\n  \u003cli\u003e2006-2009 Chevrolet Trailblazer LT 4.2L L6\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eThe Chevrolet Heavy-Duty Standard\u003c\/h3\u003e\n\u003cp\u003eEngineered to handle the constant thermal loads of heavy towing, stop-and-go utility, and off-pavement hauling without coil breakdown or spark blowout across the entire rev range.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":50448505078008,"sku":"DS-EX17G1TBY","price":118.95,"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-2006-2009-4-2l-1.jpg?v=1788648076","url":"https:\/\/performancechiptuning.com\/products\/ignition-coil-and-iridium-spark-plugs-for-chevrolet-trailblazer-2006-2009-4-2l","provider":"Performance Chip Tuning","version":"1.0","type":"link"}