{"title":"Ignition Coils for Buick Rainier","description":"\u003ch2\u003eRestore Smooth Combustion with Ignition Upgrades for Buick Rainier\u003c\/h2\u003e\n\u003cp\u003eAging factory ignition components in midsize SUVs often degrade over time due to persistent heat cycling under the hood. For drivers experiencing sluggish acceleration, rough idle, or a flashing check engine light, replacing worn secondary ignition hardware provides an immediate fix. Our select applications offer direct-fit replacement options for 2004–2007 Buick Rainier sport utility vehicles, engineered to match original electrical resistance specifications while delivering consistent, high-energy spark.\u003c\/p\u003e\n\n\u003ch3\u003eFitment for 4.2L Inline-6 and 5.3L V8 Engines\u003c\/h3\u003e\n\u003cp\u003eThe Buick Rainier was produced with two primary powertrain options, and spark delivery demands differ between them. We stock tailored solutions for each configuration:\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003e4.2L Atlas Inline-6 (2004–2007):\u003c\/strong\u003e Direct-fit coil-on-plug packs paired with matched iridium spark plugs to handle high-rpm demand and smooth out cold starts.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e5.3L Vortec V8 (2004–2007):\u003c\/strong\u003e Individual replacement coils and multi-packs engineered for high-output discharge, including round-style coil brackets common on mid-cycle GM truck architectures.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eIf you are servicing other models, browse our broader selection of \u003ca href=\"\/collections\/buick-ignition\"\u003eignition components for Buick\u003c\/a\u003e or explore race-grade hardware in our main \u003ca href=\"\/collections\/performance-ignition\"\u003eperformance ignition\u003c\/a\u003e catalog. Airflow upgrades are also available via \u003ca href=\"\/collections\/buick-air-intakes\"\u003eair intakes compatible with Buick\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003ch3\u003eBuick Rainier Ignition FAQ\u003c\/h3\u003e\n\n\u003ch3\u003eWhat engine sizes and model years do these Rainier ignition coils cover?\u003c\/h3\u003e\n\u003cp\u003eThis collection supports select 2004–2007 Buick Rainier SUVs equipped with either the 4.2L DOHC inline-6 or the 5.3L OHV V8 engine. Always verify your engine size and existing coil bracket design prior to purchasing.\u003c\/p\u003e\n\n\u003ch3\u003eWill replacing the ignition coils resolve diagnostic trouble code P0300?\u003c\/h3\u003e\n\u003cp\u003eP0300 indicates a random or multiple cylinder misfire. On the Buick Rainier platform, degraded coil boots, internal coil winding resistance, or worn spark plugs are common culprits. Swapping out worn ignition coils and spark plugs usually clears ignition-related misfires once the diagnostic trouble codes are reset.\u003c\/p\u003e\n\n\u003ch3\u003eShould I replace one faulty coil or replace all coils and spark plugs together?\u003c\/h3\u003e\n\u003cp\u003eIf one ignition coil has failed from age and heat wear, the remaining coils have faced identical operating conditions. Replacing the entire set alongside new spark plugs ensures balanced spark output across all cylinders and prevents chasing recurring misfires down the road.\u003c\/p\u003e\n\n\u003ch3\u003eHow do I identify round-style coils on a 5.3L V8 Buick Rainier?\u003c\/h3\u003e\n\u003cp\u003eGM equipped 5.3L V8 platforms with either square-body or round-body ignition coils mounted along the valve covers. Look at the metal casing of your existing coil: round-style units feature a cylindrical central body and distinct mounting spacing. Match your existing style before ordering the round-style kit listed in this collection.\u003c\/p\u003e","products":[{"product_id":"high-performance-ignition-coil-for-buick-rainier-2005-2007-5-3l","title":"High Performance Ignition Coil for Buick Rainier (2005-2007) 5.3L","description":"\u003ch2\u003eHigh-Output UF414 Ignition Coils for 2005-2007 Buick Rainier (LH6 \/ GMT360)\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eThis 8-pack of UF414 performance ignition coils replaces the restrictive and degradation-prone factory units to restore lost voltage output, resolve persistent misfires under heavy load, and provide a stronger, more consistent spark for the 5.3L V8 engine.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003ch3\u003eThe Stock GMT360 Ignition Weakness\u003c\/h3\u003e\n\u003cp\u003eThe OEM ignition coils on the 5.3L LH6 engines are notoriously prone to thermal degradation over time. Positioned directly above the exhaust manifolds, these units suffer from severe heat soak cycles that break down internal epoxy resins and compromise primary winding insulation. This thermal fatigue leads to internal arcing, erratic secondary voltage delivery, and high-rpm misfires. When subjected to the increased engine loads of towing or steep inclines, the weakened factory coils fail to produce the necessary spark energy, triggering P0300-series OBD-II codes, causing sluggish throttle response, and drastically reducing fuel efficiency.\u003c\/p\u003e\n\n\u003ch3\u003eThe Engineering Solution\u003c\/h3\u003e\n\u003cp\u003eEngineered to exceed OEM specifications, these UF414 upgrade coils utilize a high-capacity internal winding matrix and upgraded neodymium magnetic cores to significantly boost spark energy output. The external housings are constructed from high-dielectric epoxy and thermal-resistant polymers designed specifically to withstand the extreme underhood temperatures of the GMT360 chassis. By increasing the secondary voltage output and shortening the coil charge times (dwell), this comprehensive 8-pack ensures complete combustion even under heavy engine load. The improved spark duration directly translates to a stabilized idle, immediate throttle response, and the complete elimination of spark blowout during demanding towing conditions. Plug-and-play fitment ensures seamless integration with the factory wiring harness.\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;\"\u003e2005-2007 Buick Rainier\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;\"\u003e5.3L V8 LH6 \/ 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;\"\u003e300 hp \/ 330 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;\"\u003eUF414\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eCompatibility\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e2005 Buick Rainier 5.3L V8\u003c\/li\u003e\n  \u003cli\u003e2006 Buick Rainier 5.3L V8\u003c\/li\u003e\n  \u003cli\u003e2007 Buick Rainier 5.3L V8\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eThe Buick Utility Standard\u003c\/h3\u003e\n\u003cp\u003eFor a truck-based SUV designed for genuine utility, reliable ignition is not optional. Upgrading to high-performance coils ensures your Rainier maintains the necessary low-end torque for towing and consistent power delivery for daily driving, keeping the heavy-duty LH6 running efficiently for the long haul without throwing frustrating misfire codes.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":48234173792504,"sku":"DS-EMDF7SPBL","price":189.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0800\/1290\/2648\/files\/high-performance-ignition-coil-for-buick-rainier-2005-2007-5-3l-1.jpg?v=1776099127"},{"product_id":"high-performance-ignition-coils-for-buick-rainier-2004-2005-5-3l","title":"High Performance Ignition Coils for Buick Rainier (2004-2005) 5.3L","description":"\u003ch2\u003eHigh-Output Ignition Coils for 2004-2005 Buick Rainier (5.3L LM4\/LH6 \/ GMT360)\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eDirect OEM-replacement electronic ignition coils designed to restore reliable spark delivery and resolve misfires.\u003c\/strong\u003e Restores proper combustion efficiency by replacing degraded factory coil packs to eliminate rough idle, hesitation, and misfire codes under load.\u003c\/p\u003e\n\u003ch3\u003eThe Stock Rainier Ignition Shortcomings\u003c\/h3\u003e\n\u003cp\u003eThe factory D585-style ignition coils on the 5.3L Vortec V8 are notorious for thermal degradation over time. Positioned directly above the exhaust manifolds, the OEM epoxy potting material undergoes severe heat cycling. This leads to micro-cracking in the internal windings and secondary winding failure. As resistance increases, spark energy drops, leading to primary circuit faults, P0300 random misfire codes, incomplete combustion, and a noticeable drop in torque, particularly when towing or under heavy throttle inputs where dense air-fuel mixtures require maximum voltage to jump the spark plug gap.\u003c\/p\u003e\n\u003ch3\u003eThe Engineering Solution\u003c\/h3\u003e\n\u003cp\u003eThese replacement electronic coils feature reinforced epoxy resin to prevent thermal breakdown and electrical arcing under high under-hood temperatures. The internal copper windings are precision-wound to match OEM resistance specifications, ensuring direct communication with the PCM without triggering false CELs. Featuring a heavy-duty 4-blade terminal design, oval female connectors, and a reliable bolt-on mounting configuration, they guarantee a secure electrical connection and simple installation. This direct-fit upgrade restores the required kilovolt output for complete cylinder burn, smoothing out the idle and returning factory throttle response and fuel economy to the GMT360 chassis.\u003c\/p\u003e\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\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;\"\u003e5.3L LM4 \u0026amp; LH6 Vortec V8 \/ 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;\"\u003e290-300 hp \/ 325-330 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;\"\u003eD585, 10457730, 19005218, UF262\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003ch3\u003eCompatibility\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e2004 Buick Rainier 5.3L V8\u003c\/li\u003e\n\u003cli\u003e2005 Buick Rainier 5.3L V8\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eThe Buick Durability Standard\u003c\/h3\u003e\n\u003cp\u003eBuilt to handle the demanding loads of the GMT360 platform, these coils ensure reliable towing performance, sustained torque delivery, and consistent all-weather ignition for your 5.3L Rainier.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":48234302537976,"sku":"DS-EHCDLLMYQ","price":139.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0800\/1290\/2648\/files\/Ignition-Chevy-V8.jpg?v=1776103425"},{"product_id":"ignition-coil-spark-plug-for-buick-allure-lacrosse-2008-2009-rainier-2005-2007-5-3l-v8-round-style","title":"Ignition Coil \u0026 Spark Plug for Buick Allure LaCrosse (2008-2009) Rainier (2005-2007) 5.3L V8 (Round Style)","description":"\u003ch2\u003eHigh-Energy Ignition Coil \u0026amp; Spark Plug Set for 2008-2009 Buick Allure, LaCrosse\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eDirect plug-and-play ignition upgrade:\u003c\/strong\u003e Replaces the aging stock coils, plugs, and wires on your 5.3L V8 to eliminate misfires and deliver a stronger, more consistent spark.\u003c\/p\u003e\n\n\u003ch3\u003eThe Stock W-Body Ignition Shortcoming\u003c\/h3\u003e\n\u003cp\u003eOver time, the factory ignition coils on the transverse-mounted 5.3L LS4 V8 suffer from severe heat soak. The confined engine bay of the W-body chassis traps thermal energy, causing the OEM coil's internal epoxy to degrade. This thermal breakdown increases primary resistance, leading to weakened spark output, rough idling, hesitation under heavy engine load, and eventual coil failure. Furthermore, the factory plug wires gradually lose their dielectric insulation properties, causing parasitic voltage leaks and contributing to annoying misfire codes that rob the engine of power.\u003c\/p\u003e\n\n\u003ch3\u003eThe Engineering Solution\u003c\/h3\u003e\n\u003cp\u003eThis complete ignition overhaul kit replaces the restrictive and degradation-prone OEM components with high-performance alternatives. The UF414 round-style ignition coils are manufactured with premium-grade copper windings and high-temperature epoxy internals, producing an impressive 32,000 volts—a 20% increase in discharge energy over standard factory specifications. This stronger spark ensures a more complete combustion cycle, optimizing fuel efficiency and throttle response. Paired with exact-fit spark plugs and heavy-duty silicone-insulated plug wires, this kit restores reliable ignition timing, prevents voltage bleed, and is built to stand up to the extreme ambient temperatures of the LS4 engine bay.\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;\"\u003e2008-2009 Buick Allure, LaCrosse\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;\"\u003eLS4 5.3L V8 \/ W-Body\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;\"\u003e300 hp \/ 323 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;\"\u003eUF414, D514A, 748UU, 41962\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eCompatibility\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eBuick Allure \/ LaCrosse 5.3L V8 (2008-2009)\u003c\/li\u003e\n  \u003cli\u003eBuick Rainier (2005-2007)\u003c\/li\u003e\n  \u003cli\u003eCadillac Escalade\u003c\/li\u003e\n  \u003cli\u003eChevrolet Avalanche\u003c\/li\u003e\n  \u003cli\u003eChevrolet Silverado\u003c\/li\u003e\n  \u003cli\u003eChevrolet Suburban\u003c\/li\u003e\n  \u003cli\u003eChevrolet Express\u003c\/li\u003e\n  \u003cli\u003eChevrolet Tahoe\u003c\/li\u003e\n  \u003cli\u003eChevrolet Trailblazer\u003c\/li\u003e\n  \u003cli\u003eGMC Savana\u003c\/li\u003e\n  \u003cli\u003eGMC Yukon\u003c\/li\u003e\n  \u003cli\u003eHummer H3\u003c\/li\u003e\n  \u003cli\u003e\u003cem\u003eNote: Only applicable to round style coils (UF414 \/ D514A). Not suitable for square body coils (UF413 \/ D510C). Please verify original coil shape before ordering.\u003c\/em\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eThe Buick Performance Standard\u003c\/h3\u003e\n\u003cp\u003eWhether you're cruising the highway or demanding maximum passing power from the 5.3L LS4, reliable ignition is non-negotiable. This kit ensures your W-body Buick delivers the smooth, torquey performance it was engineered for, eliminating frustrating misfires and providing a consistent, powerful spark under all load conditions.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":49710905065720,"sku":"DS-EKAMPDLB5","price":179.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0800\/1290\/2648\/files\/ignition-coil-spark-plug-for-buick-allure-lacrosse-2008-2009-rainier-2005-2007-5-3l-v8-round-style-1.jpg?v=1782795847"},{"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"},{"product_id":"ignition-coil-and-iridium-spark-plugs-for-buick-rainier-2006-2007-4-2l","title":"Ignition Coil and Iridium Spark Plugs for Buick Rainier (2006-2007) 4.2L","description":"\u003ch2\u003eDirect-Fit Ignition Coil \u0026amp; Iridium Spark Plug Service Kit for 2006-2007 Buick Rainier\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eDirect-Replacement Ignition Overhaul:\u003c\/strong\u003e Restores factory secondary ignition performance, stabilizes idle harmonics, and resolves multi-cylinder misfires under high-load conditions on the GM Atlas 4.2L platform.\u003c\/p\u003e\n\n\u003ch3\u003eThe Stock Rainier LL8 Ignition Degradation\u003c\/h3\u003e\n\u003cp\u003eThe Vortec 4.200 inline-six configuration features tight spark plug wells situated directly atop the DOHC cylinder head, trapping significant thermal energy. Over prolonged heat cycles, OEM coil packs suffer epoxy insulation breakdown and secondary winding dielectric fatigue. This causes microscopic spark arc-through, resulting in high-RPM stutter, increased hydrocarbon emissions, and intermittent P0300 through P0306 diagnostic trouble codes. Simultaneously, factory standard-electrode spark plugs experience accelerated gap erosion, requiring elevated secondary voltage that overstresses aging coils.\u003c\/p\u003e\n\n\u003ch3\u003eThe Engineering Solution\u003c\/h3\u003e\n\u003cp\u003eThis comprehensive service pack combines 6 direct-fit coil-on-plug assemblies featuring high-grade electrolytic copper primary and secondary windings with premium potted epoxy casings to resist thermal degradation and internal shorting. Paired with 6 fine-wire iridium spark plugs, the kit reduces requisite firing voltage while providing superior spark kernel stability and resistance to carbon fouling across varying combustion chamber pressures. Direct-fit blade terminals and silicone dielectric boots guarantee positive contact and seal out moisture.\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;\"\u003e2006-2007 Buick Rainier\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;\"\u003eAtlas 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\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 Buick Rainier CXL 4.2L L6 Gas (GMT360)\u003c\/li\u003e\n  \u003cli\u003e2006 Buick Rainier CXL Plus 4.2L L6 Gas (GMT360)\u003c\/li\u003e\n  \u003cli\u003e2007 Buick Rainier CXL 4.2L L6 Gas (GMT360)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eThe Buick Reliability Standard\u003c\/h3\u003e\n\u003cp\u003eEngineered to sustain smooth power transfer and dependable towing capacity, this complete ignition refresh eliminates intermittent misfires and restores the refined, quiet cruise characteristics engineered into the Rainier platform.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":50448505143544,"sku":"DS-ED438J05S","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-buick-rainier-2006-2007-4-2l-1.jpg?v=1788648104"},{"product_id":"ignition-coil-spark-plugs-for-buick-rainier-2004-2005-5-3l","title":"Ignition Coil + Spark Plugs for Buick Rainier (2004-2005) 5.3L","description":"\u003ch2 style=\"font-size: clamp(18px, 3vw, 21px); margin-bottom: 15px; line-height: 1.3;\"\u003eDirect-Fit Ignition Coil and Spark Plug Kit for 2004-2005 Buick Rainier (GMT360)\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat it Does:\u003c\/strong\u003e The Ignition Coil + Spark Plugs Kit replaces degraded primary ignition components on the 2004-2005 Buick Rainier to eliminate cylinder misfires and restore complete combustion efficiency.\u003c\/p\u003e\n\n\u003ch3\u003eThe Stock Buick Rainier Ignition Breakdown\u003c\/h3\u003e\n\u003cp\u003eFactory coil packs on the \u003cstrong\u003eGMT360\u003c\/strong\u003e platform endure persistent thermal cycling and severe underhood heat soak, accelerating dielectric breakdown inside the internal winding insulation. Over time, high resistance leads to micro-arcing, intermittent secondary voltage drops, and partial combustion. Paired with aged, eroded spark plug electrodes that widen the spark gap beyond specification, the stock ignition system suffers from severe high-load misfires (DTC P0300), rough idle stability issues, unburned hydrocarbon buildup, and uncharacteristic sluggishness during heavy throttle input.\u003c\/p\u003e\n\n\u003ch3\u003eThe Engineering Solution\u003c\/h3\u003e\n\u003cp\u003eThis matched overhaul kit restores high-voltage secondary output to factory-calibrated tolerances. The heavy-duty \u003cstrong\u003eD585\u003c\/strong\u003e-style coil-near-plug units are engineered with high-grade copper windings and vacuum-potted epoxy insulation to resist continuous engine-bay thermal degradation and internal short circuits. Matched with pre-gapped \u003cstrong\u003eNGK\u003c\/strong\u003e spark plugs featuring corrosion-resistant trivalent metal plating and high-alumina silicate ceramic insulators, this setup ensures consistent spark kernel propagation, optimized flame front travel, and dependable arc stabilization across the entire RPM band without ECU recalibration.\u003c\/p\u003e\n\n\u003ch3\u003eWhat's Included\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e8 Energy Ignition Coils\u003c\/li\u003e\n  \u003cli\u003e8 NGK Spark Plugs\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cdiv style=\"overflow-x: auto; margin-bottom: 20px;\"\u003e\n  \u003ctable width=\"100%\" style=\"border-collapse: collapse; border: 1px solid #e0e0e0; font-size: 14px; min-width: 300px;\"\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 Buick Rainier\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;\"\u003e5.3L V8 (Vortec 5300 LM4 \/ LH6) \/ 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;\"\u003e290-300 hp \/ 325-330 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;\"\u003eUF262, 3186, 178-8399, GN10119, IC413, U5183, 410001, C-593, 10457730, 19005218, D585, 140040ACC, 3IC221, 50016, 36-1205, 5113, 2505-247733, E254, C1251, C1251-8, 12563293, 2-50016, 8104577300, C1251VC, 5C1082, IC413SB, UF262T, 673-7101, 52-1647, C1251SPEC, EBC1347, 26C1048, IGC0127, 920-1020, SKIC121, CUF262, 2IGC0199, 353N, 3-566, 8263, 82633, 8286, 82863, 48658\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003ch3\u003eCompatibility\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e2004 Buick Rainier 5.3L V8\u003c\/li\u003e\n  \u003cli\u003e2005 Buick Rainier 5.3L V8\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eFrequently Asked Questions \u0026amp; Fitment Warnings\u003c\/h3\u003e\n\u003ch4\u003eDoes this fit the GMT360 Rainier?\u003c\/h4\u003e\n\u003cp\u003eYes, this is a direct fit for the 2004-2005 Buick Rainier equipped with the \u003cstrong\u003e5.3L V8\u003c\/strong\u003e engine; it does not fit models equipped with the 4.2L inline-six (LL8) engine.\u003c\/p\u003e\n\n\u003ch4\u003eAre spark plug wires included with this kit?\u003c\/h4\u003e\n\u003cp\u003eNo, secondary spark plug wires are not included and must be inspected or sourced separately during service.\u003c\/p\u003e\n\n\u003ch3\u003eThe Buick Durability Standard\u003c\/h3\u003e\n\u003cp\u003eEngineered to handle heavy loads, steep grades, and long-distance towing, this ignition refresh ensures the robust Vortec V8 delivers unwavering torque reliability under real-world truck operating conditions.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":67556668145912,"sku":"DS-E437GTMW3","price":224.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0800\/1290\/2648\/files\/ignition-coil-spark-plugs-for-buick-rainier-2004-2005-5-3l-1.jpg?v=1790886828"}],"url":"https:\/\/performancechiptuning.com\/collections\/buick-rainier-ignition.oembed","provider":"Performance Chip Tuning","version":"1.0","type":"link"}