{"product_id":"ignition-coil-and-iridium-spark-plugs-for-buick-rainier-2004-2005-4-2l","title":"Ignition Coil and Iridium Spark Plugs for Buick Rainier (2004-2005) 4.2L","description":"\u003ch2\u003eDirect-Replacement Ignition Kit for 2004-2005 Buick Rainier\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat it Does:\u003c\/strong\u003e Replaces degraded factory coil packs and worn spark plugs to eliminate secondary ignition breakdown, misfires, and erratic idle on the 4.2L inline-six platform.\u003c\/p\u003e\n\n\u003ch3\u003eThe Stock Rainier Ignition Coil Degradation\u003c\/h3\u003e\n\u003cp\u003eThe Atlas LL8 inline-six engine relies on coil-on-plug architecture directly seated in deep spark plug wells. Over repeated heat-cycling, OEM epoxy encapsulation degrades, leading to micro-cracks in the coil housings. This causes dielectric breakdown, internal arc-over, and severe misfires under load. Simultaneously, standard copper or worn platinum plugs suffer gap erosion, increasing required secondary voltage and accelerating coil burn-out.\u003c\/p\u003e\n\n\u003ch3\u003eThe Engineering Solution\u003c\/h3\u003e\n\u003cp\u003eThis complete ignition overhaul kit pairs 6 heavy-duty coil packs with 6 fine-wire iridium spark plugs. The ignition coils feature high-conductivity copper primary and secondary windings encased in high-dielectric epoxy to withstand extreme engine bay thermal cycling. The iridium spark plugs offer ultra-high melting points and minimal electrode erosion, requiring less voltage to fire while producing a focused flame kernel for reliable combustion and complete fuel burn.\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;\"\u003e2004-2005 Buick Rainier 4.2L\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;\"\u003eVortec 4200 (Atlas LL8 I6) \/ 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, 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\u003e2004 Buick Rainier 4.2L L6 (CXL, CXL Plus)\u003c\/li\u003e\n  \u003cli\u003e2005 Buick Rainier 4.2L L6 (CXL, CXL Plus)\u003c\/li\u003e\n  \u003cli\u003eInterchange: UF303, UF-303, 12568062, 19300921, 8-12568-062-0, 5C1392, E255, IC414, GN10114\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eThe Buick Reliability Standard\u003c\/h3\u003e\n\u003cp\u003eEngineered for the demands of midsize SUV towing and daily operation, this ignition kit restores lost fuel economy, sharp throttle response, and smooth idle stability without triggering diagnostic trouble codes.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":50429893771512,"sku":"DS-E9ITNGEDF","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-buick-rainier-2004-2005-4-2l-1.jpg?v=1788452674","url":"https:\/\/performancechiptuning.com\/es\/products\/ignition-coil-and-iridium-spark-plugs-for-buick-rainier-2004-2005-4-2l","provider":"Performance Chip Tuning","version":"1.0","type":"link"}