{"product_id":"ignition-coil-spark-plugs-for-gmc-c3500-sierra-2500-hd-3500-2001-2002-8-1l-v8","title":"Ignition Coil \u0026 Spark Plugs for GMC C3500 Sierra 2500 HD 3500 (2001-2002) 8.1L V8","description":"\u003ch2\u003eComplete Ignition Tune-Up Kit for 2001-2002 GMC Sierra 8.1L\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eThis comprehensive ignition tune-up kit replaces the degrading factory coils, wires, and plugs on your L18 V8 to restore proper firing voltage and eliminate under-load misfires.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003ch3\u003eThe Stock Sierra GMT800 Ignition Weakness\u003c\/h3\u003e\n\u003cp\u003eThe massive 8.1L Vortec V8 generates extreme under-hood temperatures, especially when the vehicle is used for towing heavy loads up sustained grades. Over time, this intense heat cycling degrades the internal epoxy and primary\/secondary windings of the OEM ignition coils. Furthermore, the factory spark plug wire insulation breaks down, leading to micro-arcing against the engine block or exhaust manifolds. This thermal degradation results in severe voltage leaks, high-rpm misfires, rough idling, trigger faults, and compromised fuel efficiency.\u003c\/p\u003e\n\n\u003ch3\u003eThe Engineering Solution\u003c\/h3\u003e\n\u003cp\u003eThis 24-piece replacement kit directly addresses the thermal shortcomings of the stock GM components. The upgraded D580-style ignition coils are manufactured with high-grade copper windings and premium dielectric epoxy that actively resist thermal breakdown and pinhole leaks. Paired with heavy-duty insulated spark plug wires and precision-gapped spark plugs, this system ensures maximum spark energy is delivered directly to the combustion chamber without dissipation. This guarantees a complete fuel burn, lowers emissions, and stabilizes power delivery when the Vortec 8100 is operating under heavy, torque-demanding loads.\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;\"\u003e2001-2002 GMC Sierra 2500 HD \/ 3500\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;\"\u003eL18 Vortec 8100 (8.1L V8) \/ GMT800\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;\"\u003e340 hp \/ 455 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;\"\u003eD580, UF192, 12556450, 5C1078\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eCompatibility\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e2001 GMC Sierra 2500 HD (8.1L V8)\u003c\/li\u003e\n  \u003cli\u003e2002 GMC Sierra 2500 HD (8.1L V8)\u003c\/li\u003e\n  \u003cli\u003e2001 GMC Sierra 3500 (8.1L V8)\u003c\/li\u003e\n  \u003cli\u003e2002 GMC Sierra 3500 (8.1L V8)\u003c\/li\u003e\n  \u003cli\u003e2001 GMC C3500 (8.1L V8)\u003c\/li\u003e\n  \u003cli\u003e2002 GMC C3500 (8.1L V8)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eThe GMC Heavy-Duty Standard\u003c\/h3\u003e\n\u003cp\u003eRestoring the ignition system on your heavy-duty Sierra ensures the massive low-end torque required for serious hauling remains consistent. Reliable spark delivery means you can confidently tow up steep grades without worrying about engine surging, stumbling, or sudden power loss.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":50065388503288,"sku":"DS-EHXWZZ8IZ","price":239.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0800\/1290\/2648\/files\/ignition-coil-spark-plugs-for-gmc-c3500-sierra-2500-hd-3500-2001-2002-8-1l-v8-1.webp?v=1785257251","url":"https:\/\/performancechiptuning.com\/fr\/products\/ignition-coil-spark-plugs-for-gmc-c3500-sierra-2500-hd-3500-2001-2002-8-1l-v8","provider":"Performance Chip Tuning","version":"1.0","type":"link"}