{"product_id":"ignition-coil-spark-plugs-for-gmc-suburban-1996-1999-5-7l-7-4l","title":"Ignition Coil + Spark Plugs for GMC Suburban (1996-1999) 5.7L 7.4L","description":"\u003ch2 style=\"font-size: clamp(18px, 3vw, 21px); margin-bottom: 15px; line-height: 1.3;\"\u003eDirect-Fit Ignition Coil and Spark Plug Refresh Kit for 1996-1999 GMC Suburban (GMT400)\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat it Does:\u003c\/strong\u003e The ignition coil and spark plug kit restores secondary ignition voltage and consistent flame front propagation on 1996-1999 GMC Suburban utility vehicles to eliminate misfires and restore heavy-load combustion efficiency.\u003c\/p\u003e\n\n\u003ch3\u003eThe Stock GMC Suburban Ignition Voltage Breakdown\u003c\/h3\u003e\n\u003cp\u003eUnder heavy towing and prolonged operation, the factory remote-mounted ignition coil on the \u003cstrong\u003eGMT400\u003c\/strong\u003e chassis suffers from severe thermal cycling. Over decades, engine bay heat soak breaks down the internal primary and secondary coil winding insulation, causing dielectric failure, voltage leakages, and weak spark output. Compounded by widened spark plug gaps from electrode erosion on the \u003cstrong\u003eVortec L31\u003c\/strong\u003e and \u003cstrong\u003eVortec L29\u003c\/strong\u003e engines, the ignition system struggles to ionize the air-fuel mixture under high cylinder pressures, triggering random misfires (P0300), sluggish off-idle throttle response, and unburned fuel entering the exhaust stream.\u003c\/p\u003e\n\n\u003ch3\u003eThe Engineering Solution\u003c\/h3\u003e\n\u003cp\u003eThis comprehensive tune-up kit replaces high-mileage ignition hardware with a high-dielectric epoxy-potted ignition coil engineered to resist thermal degradation and internal short circuits. Featuring premium magnetic lamination steel cores, the coil delivers a robust secondary discharge capable of firing under lean cruise and heavy-throttle enrichment. Paired with eight precision-gapped spark plugs equipped with nickel-alloy shell plating and high-thermal-conductivity ceramic insulators, this setup ensures consistent anti-fouling protection, rapid heat dissipation, and stable spark timing under sustained load.\u003c\/p\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: solid font-size: min-width:\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;\"\u003e1996-1999 GMC Suburban\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;\"\u003eVortec 5.7L (L31) \/ 7.4L (L29) \/ GMT400\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;\"\u003e255-290 hp \/ 330-410 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\u003e10489421\u003c\/strong\u003e, \u003cstrong\u003e19207138\u003c\/strong\u003e, \u003cstrong\u003e19418996\u003c\/strong\u003e, \u003cstrong\u003eD577\u003c\/strong\u003e\n\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\u003e1996-1999 GMC Suburban 1500 5.7L V8\u003c\/li\u003e\n  \u003cli\u003e1996-1999 GMC Suburban 2500 5.7L V8\u003c\/li\u003e\n  \u003cli\u003e1996-1999 GMC Suburban 2500 7.4L V8\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eDoes this fit the GMT400 Suburban?\u003c\/h4\u003e\n\u003cp\u003eYes, this is a direct fit for the 1996-1999 GMC Suburban equipped with the \u003cstrong\u003eL31\u003c\/strong\u003e 5.7L or \u003cstrong\u003eL29\u003c\/strong\u003e 7.4L Vortec engine.\u003c\/p\u003e\n\n\u003ch4\u003eAre spark plug wires included with this kit?\u003c\/h4\u003e\n\u003cp\u003eNo, this service kit includes one remote-mount ignition coil and eight spark plugs; high-tension secondary leads must be sourced separately.\u003c\/p\u003e\n\n\u003ch3\u003eThe GMC Towing Caliber\u003c\/h3\u003e\n\u003cp\u003eEngineered to handle severe utility duty, this ignition package restores dependable cold-start behavior, rock-solid idle stability, and the high-output spark delivery required when pulling maximum gross vehicle weight.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":67518828413176,"sku":"DS-EF2P1JNDS","price":74.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0800\/1290\/2648\/files\/ignition-coil-spark-plugs-for-gmc-suburban-1996-1999-5-7l-7-4l-1.jpg?v=1790370690","url":"https:\/\/performancechiptuning.com\/fr\/products\/ignition-coil-spark-plugs-for-gmc-suburban-1996-1999-5-7l-7-4l","provider":"Performance Chip Tuning","version":"1.0","type":"link"}