{"product_id":"ignition-coil-spark-plugs-for-chevrolet-astro-blazer-1996-2005-4-3l","title":"Ignition Coil + Spark Plugs for Chevrolet Astro Blazer (1996-2005) 4.3L","description":"\u003ch2 style=\"font-size: clamp(18px, 3vw, 21px); margin-bottom: 15px; line-height: 1.3;\"\u003eDirect-Fit OEM Replacement Ignition Coil \u0026amp; Spark Plug Kit for 1996-2005 Chevrolet Astro, Blazer 4.3L (S\/T \u0026amp; M-Van \/ Vortec 4300)\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat it Does:\u003c\/strong\u003e The direct-fit ignition kit restores primary and secondary ignition efficiency on the 1996-2005 Chevrolet Astro and Blazer to eliminate misfires, stabilize idle quality, and restore peak combustion pressure.\u003c\/p\u003e\n\n\u003ch3\u003eThe Stock Chevrolet Astro, Blazer Ignition Breakdown\u003c\/h3\u003e\n\u003cp\u003eFactory ignition setups on the 4.3L \u003cstrong\u003eVortec 4300\u003c\/strong\u003e (Engine Code \u003cstrong\u003eL35\u003c\/strong\u003e \/ \u003cstrong\u003eLU3\u003c\/strong\u003e) face heavy thermal loading due to tight engine packaging in the \u003cstrong\u003eM-Van\u003c\/strong\u003e doghouse and \u003cstrong\u003eS\/T platform\u003c\/strong\u003e engine bays. Over sustained heat cycles, the factory coil casing degrades, leading to dielectric breakdown, secondary winding shorts, and internal micro-cracks. Concurrently, factory spark plugs suffer from eroded electrode gaps, demanding elevated secondary ignition voltage from an already compromised coil. This failure chain manifests as intermittent multi-cylinder misfires (DTC P0300), fouled plugs, unburnt hydrocarbon wash, and hesitation under load.\u003c\/p\u003e\n\n\u003ch3\u003eThe Engineering Solution\u003c\/h3\u003e\n\u003cp\u003eThis replacement ignition kit pairs a high-output epoxy-potted ignition coil with durable spark plugs configured to factory dielectric specifications. Built to withstand extreme thermal fluctuations without insulation failure, the coil utilizes copper windings to produce consistent kilovolt discharge across the entire RPM range. Matching original \u003cstrong\u003eOE 10489421\u003c\/strong\u003e and \u003cstrong\u003eD577\u003c\/strong\u003e tolerances, this kit restores accurate dwell response, minimizes secondary resistance, and delivers clean, complete combustion for reliable start-up and towing under high manifold pressure.\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: 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;\"\u003e1996-2005 Chevrolet Astro, Blazer\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;\"\u003e4.3L Vortec 4300 (L35 \/ LU3) \/ GM S\/T \u0026amp; M-Platform\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;\"\u003e190 hp \/ 250 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;\"\u003e10489421, 19207138, 19418996, D577, DR-49, 8104894210\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\u003e1996-2005 Chevrolet Astro 4.3L V6\u003c\/li\u003e\n  \u003cli\u003e1996-2005 Chevrolet Blazer 4.3L V6\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eDoes this fit the GM S\/T and M-Van Astro, Blazer?\u003c\/strong\u003e\u003cbr\u003e Yes, this is a direct fit for the 1996-2005 Chevrolet Astro and Blazer equipped with the 4.3L \u003cstrong\u003eVortec 4300\u003c\/strong\u003e V6 engine.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhy are 8 spark plugs included for a 6-cylinder engine?\u003c\/strong\u003e\u003cbr\u003e The kit includes 8 spark plugs standard packaging; use 6 plugs for your 4.3L installation and retain the remaining 2 as direct spares.\u003c\/p\u003e\n\n\u003ch3\u003eThe Chevrolet Truck Caliber\u003c\/h3\u003e\n\u003cp\u003eWhether navigating highway corridors in an Astro or towing off-pavement in a Blazer, uninterrupted ignition delivery is required to handle sustained loads and extreme duty cycles without missing a stroke.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":50625816920312,"sku":"DS-EG2IY1RI4","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-chevrolet-astro-blazer-1996-2005-4-3l-1.jpg?v=1790351763","url":"https:\/\/performancechiptuning.com\/fr\/products\/ignition-coil-spark-plugs-for-chevrolet-astro-blazer-1996-2005-4-3l","provider":"Performance Chip Tuning","version":"1.0","type":"link"}