{"product_id":"high-performance-ignition-coil-for-hummer-h3-h3t-2008-2010-5-3l","title":"High Performance Ignition Coil for Hummer H3 H3T (2008-2010) 5.3L","description":"\u003ch2\u003eUpgraded High Performance Ignition Coils for 2008-2010 Hummer H3 (5.3L LH8\/LH9 \/ GMT345)\u003c\/h2\u003e\n  \n  \u003cp\u003e\u003cstrong\u003eWhat it Does:\u003c\/strong\u003e Delivers a stronger, more consistent spark to the combustion chamber, replacing degraded factory coils to cure misfires and restore throttle response on high-mileage V8 platforms.\u003c\/p\u003e\n  \n  \u003ch3\u003eThe Stock GM GMT345 Ignition Coil Degradation\u003c\/h3\u003e\n  \u003cp\u003eFactory GM ignition coils on the 5.3L LH8 and LH9 platforms are subjected to extreme thermal cycling within the engine bay, particularly when operating under heavy load during off-road articulation or towing. Over time, the OEM dielectric epoxy degrades, leading to internal voltage leaks. This thermal breakdown compromises the magnetic field generation within the primary and secondary windings. The resulting weak spark causes intermittent misfires under load, hesitation during acceleration, reduced fuel economy, and eventual P0300-series diagnostic trouble codes. Furthermore, the OEM rubber boots become brittle and fail to maintain a proper seal against the spark plug ceramic, allowing moisture intrusion and arcing.\u003c\/p\u003e\n  \n  \u003ch3\u003eThe Engineering Solution\u003c\/h3\u003e\n  \u003cp\u003eThese replacement UF414 ignition coils are engineered to exceed OEM specifications, directly addressing the thermal limitations of the factory units. Utilizing high-temperature resistant epoxy vacuum-sealed within the coil housing, these upgraded units eliminate internal air pockets that cause premature insulation breakdown. The primary and secondary copper windings feature a specialized enamel coating and optimized turn ratios to output a hotter, faster-charging spark. This translates to complete fuel burn during the power stroke, mitigating carbon fouling and restoring torque delivery. Additionally, the pre-greased, heat-resistant silicone boots provide superior dielectric isolation and a weather-tight seal against the spark plug, ensuring maximum voltage transfer even in demanding environments.\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;\"\u003e2008-2010 Hummer H3 \u0026amp; H3T\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 (LH8 \/ LH9) \/ GMT345\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 \/ 320 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 (Set of 8)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/table\u003e\n \n  \u003ch3\u003eCompatibility\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003e2008 Hummer H3 5.3L V8 (Alpha)\u003c\/li\u003e\n    \u003cli\u003e2009 Hummer H3 5.3L V8 (Alpha)\u003c\/li\u003e\n    \u003cli\u003e2009 Hummer H3T 5.3L V8 (Alpha)\u003c\/li\u003e\n    \u003cli\u003e2010 Hummer H3 5.3L V8 (Alpha)\u003c\/li\u003e\n    \u003cli\u003e2010 Hummer H3T 5.3L V8 (Alpha)\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch3\u003eThe Hummer Durability Standard\u003c\/h3\u003e\n  \u003cp\u003eFor a 4x4 built for overland travel and utility, drivetrain reliability is mandatory. Upgrading to these reinforced ignition coils ensures steady power delivery, optimal fuel efficiency, and dependable performance whether navigating rock-crawling trails or hauling heavy payloads.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":48234179297528,"sku":"DS-EQ566S9TM","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-hummer-h3-h3t-2008-2010-5-3l-1.jpg?v=1776099346","url":"https:\/\/performancechiptuning.com\/products\/high-performance-ignition-coil-for-hummer-h3-h3t-2008-2010-5-3l","provider":"Performance Chip Tuning","version":"1.0","type":"link"}