{"product_id":"ignition-coil-and-iridium-spark-plugs-for-hummer-h3t-2009-2010-3-7l","title":"Ignition Coil and Iridium Spark Plugs for Hummer H3T (2009-2010) 3.7L","description":"\u003ch2\u003eDirect-Fit Ignition Coil and Iridium Spark Plug Kit for 2009-2010 Hummer H3\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat it Does:\u003c\/strong\u003e The Ignition Coil and Iridium Spark Plug Kit restores secondary ignition energy and consistent flame-front propagation on the 2009-2010 H3 to eliminate cylinder misfires and restore lost engine performance.\u003c\/p\u003e\n\n\u003ch3\u003eThe Stock Hummer H3 Secondary Ignition Breakdown\u003c\/h3\u003e\n\u003cp\u003eIn the cramped bay of the \u003cstrong\u003eGMT345\u003c\/strong\u003e chassis, continuous thermal cycling severely degrades factory coil-on-plug modules. Over time, internal micro-arcing compromises the primary and secondary copper windings, while thermal fatigue breaks down the dielectric epoxy resin and silicone plug boots. Compounding this, standard nickel-core spark plugs suffer from accelerated electrode erosion, increasing the plug gap and demanding higher dielectric breakdown voltage. This results in erratic spark delivery, unburnt hydrocarbon build-up, catalyst degradation, and persistent P0300-P0305 random misfire diagnostic trouble codes under load.\u003c\/p\u003e\n\n\u003ch3\u003eThe Engineering Solution\u003c\/h3\u003e\n\u003cp\u003eEngineered as a synchronized drop-in refresh, this kit pairs reinforced pencil ignition coils with ultra-fine-wire iridium spark plugs. The coils utilize premium copper wire with upgraded internal magnetic lamination and high-grade dielectric potting to resist heat soak, electrical leakages, and mechanical vibration. Paired with laser-welded iridium center electrodes, this package significantly lowers the required ionization voltage, ensuring crisp arc stability, optimal combustion efficiency, and precise throttle response across the entire powerband.\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; margin-bottom: 20px;\"\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;\"\u003e2009-2010 Hummer H3 \/ H3T\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;\"\u003e3.7L Atlas \u003cstrong\u003eLLR\u003c\/strong\u003e Inline-5 \/ \u003cstrong\u003eGMT345\u003c\/strong\u003e\n\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;\"\u003e239 hp \/ 241 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;\"\u003e\n\u003cstrong\u003eUF497\u003c\/strong\u003e, \u003cstrong\u003e12596547\u003c\/strong\u003e, 5C1615, D1935E, 1788471, CUF497, 8125965470\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eCompatibility\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e2009-2010 Hummer H3 Base 3.7L L5\u003c\/li\u003e\n  \u003cli\u003e2009-2010 Hummer H3 Adventure 3.7L L5\u003c\/li\u003e\n  \u003cli\u003e2009-2010 Hummer H3 Luxury 3.7L L5\u003c\/li\u003e\n  \u003cli\u003e2009-2010 Hummer H3T Base 3.7L L5\u003c\/li\u003e\n  \u003cli\u003e2009-2010 Hummer H3T Adventure 3.7L L5\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eDoes this fit the GMT345 H3?\u003c\/strong\u003e\u003cbr\u003e Yes, this is a direct fit for the 2009-2010 Hummer H3 and H3T equipped with the 3.7L \u003cstrong\u003eLLR\u003c\/strong\u003e inline-five engine.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eAre the iridium spark plugs pre-gapped for the Atlas 3.7L?\u003c\/strong\u003e\u003cbr\u003e Yes, they are factory gapped to OEM specifications, though checking gap clearance prior to installation is always recommended.\u003c\/p\u003e\n\n\u003ch3\u003eThe Hummer Heavy-Duty Trail Standard\u003c\/h3\u003e\n\u003cp\u003eBuilt to handle extreme trail conditions, high ambient thermal loads, and heavy utility demands, this complete ignition service pack provides dependable spark stability and sustained low-end torque retention on and off the pavement.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":50603795546360,"sku":"DS-E9QYGDK5Y","price":89.95,"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-hummer-h3t-2009-2010-3-7l-1.jpg?v=1790088462","url":"https:\/\/performancechiptuning.com\/fr\/products\/ignition-coil-and-iridium-spark-plugs-for-hummer-h3t-2009-2010-3-7l","provider":"Performance Chip Tuning","version":"1.0","type":"link"}