{"product_id":"ignition-coil-and-iridium-spark-plugs-for-jeep-grand-cherokee-2000-2004-4-0l","title":"Ignition Coil and Iridium Spark Plugs for Jeep Grand Cherokee (2000-2004) 4.0L","description":"\u003ch2\u003eDirect-Fit Ignition Coil Rail \u0026amp; Iridium Spark Plug Kit for 2000-2004 Jeep Grand Cherokee\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003ePrimary Function:\u003c\/strong\u003e Restores complete secondary ignition integrity and combustion efficiency across all cylinders by replacing the failure-prone factory coil cassette and degraded plugs on the 4.0L Inline-6 engine.\u003c\/p\u003e\n\n\u003ch3\u003eThe Stock Grand Cherokee Coil Rail Heat Soak Vulnerability\u003c\/h3\u003e\n\u003cp\u003eThe distributorless ignition system (DIS) on the 4.0L PowerTech engine mounts the unified coil rail assembly directly above the cylinder head. Sustained radiant heat cycles cause internal epoxy breakdown, core delamination, and micro-cracking across the cassette housing. Combined with hardened silicone boots, these thermal stresses allow high-voltage secondary current to arc to the block, resulting in persistent random misfires (P0300–P0306), unburnt fuel loading the catalytic converter, and rough idle under operating temperatures.\u003c\/p\u003e\n\n\u003ch3\u003eThe Engineering Solution\u003c\/h3\u003e\n\u003cp\u003eThis ignition service kit combines an upgraded three-coil waste-spark cassette rail with fine-wire iridium spark plugs. The replacement rail features reinforced thermoplastic housing with high-grade vacuum-potted epoxy insulation to resist thermal saturation and prevent voltage bleed. The paired iridium spark plugs offer superior thermal and erosion resistance compared to standard copper cores, requiring lower strike voltage from the primary windings and ensuring reliable flame-front propagation during heavy load cycles.\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;\"\u003e2000-2004 Jeep Grand Cherokee\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;\"\u003e4.0L AMC 242 Inline-6 (PowerTech) \/ WJ Chassis\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;\"\u003e195 hp \/ 230 lb-ft (Approx)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd style=\"padding:8px;\"\u003e\u003cstrong\u003ePart Number \/ Interchange\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003eUF296, UF-296, 56041476AA, 56041476AB, 5C1181, 5C1182, C1230, C1263, 56041019, IC399, E239\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eCompatibility\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003e2000-2004 Jeep Grand Cherokee:\u003c\/strong\u003e Laredo, Limited, Special Edition, Sport (4.0L L6 - Gas)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eThe Jeep Durability Standard\u003c\/h3\u003e\n\u003cp\u003eEngineered to handle extreme engine bay operating temperatures during low-speed rock crawling, trail riding, and heavy payload demands without ignition breakdown.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":50428870951160,"sku":"DS-E7APYJ8DV","price":109.95,"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-jeep-grand-cherokee-2000-2004-4-0l-1.jpg?v=1788444848","url":"https:\/\/performancechiptuning.com\/products\/ignition-coil-and-iridium-spark-plugs-for-jeep-grand-cherokee-2000-2004-4-0l","provider":"Performance Chip Tuning","version":"1.0","type":"link"}