{"product_id":"ignition-coil-spark-plugs-for-buick-rainier-2004-2005-5-3l","title":"Ignition Coil + Spark Plugs for Buick Rainier (2004-2005) 5.3L","description":"\u003ch2 style=\"font-size: clamp(18px, 3vw, 21px); margin-bottom: 15px; line-height: 1.3;\"\u003eDirect-Fit Ignition Coil and Spark Plug Kit for 2004-2005 Buick Rainier (GMT360)\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat it Does:\u003c\/strong\u003e The Ignition Coil + Spark Plugs Kit replaces degraded primary ignition components on the 2004-2005 Buick Rainier to eliminate cylinder misfires and restore complete combustion efficiency.\u003c\/p\u003e\n\n\u003ch3\u003eThe Stock Buick Rainier Ignition Breakdown\u003c\/h3\u003e\n\u003cp\u003eFactory coil packs on the \u003cstrong\u003eGMT360\u003c\/strong\u003e platform endure persistent thermal cycling and severe underhood heat soak, accelerating dielectric breakdown inside the internal winding insulation. Over time, high resistance leads to micro-arcing, intermittent secondary voltage drops, and partial combustion. Paired with aged, eroded spark plug electrodes that widen the spark gap beyond specification, the stock ignition system suffers from severe high-load misfires (DTC P0300), rough idle stability issues, unburned hydrocarbon buildup, and uncharacteristic sluggishness during heavy throttle input.\u003c\/p\u003e\n\n\u003ch3\u003eThe Engineering Solution\u003c\/h3\u003e\n\u003cp\u003eThis matched overhaul kit restores high-voltage secondary output to factory-calibrated tolerances. The heavy-duty \u003cstrong\u003eD585\u003c\/strong\u003e-style coil-near-plug units are engineered with high-grade copper windings and vacuum-potted epoxy insulation to resist continuous engine-bay thermal degradation and internal short circuits. Matched with pre-gapped \u003cstrong\u003eNGK\u003c\/strong\u003e spark plugs featuring corrosion-resistant trivalent metal plating and high-alumina silicate ceramic insulators, this setup ensures consistent spark kernel propagation, optimized flame front travel, and dependable arc stabilization across the entire RPM band without ECU recalibration.\u003c\/p\u003e\n\n\u003ch3\u003eWhat's Included\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e8 Energy Ignition Coils\u003c\/li\u003e\n  \u003cli\u003e8 NGK Spark Plugs\u003c\/li\u003e\n\u003c\/ul\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;\"\u003e2004-2005 Buick Rainier\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;\"\u003e5.3L V8 (Vortec 5300 LM4 \/ LH6) \/ GMT360\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;\"\u003e290-300 hp \/ 325-330 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;\"\u003eUF262, 3186, 178-8399, GN10119, IC413, U5183, 410001, C-593, 10457730, 19005218, D585, 140040ACC, 3IC221, 50016, 36-1205, 5113, 2505-247733, E254, C1251, C1251-8, 12563293, 2-50016, 8104577300, C1251VC, 5C1082, IC413SB, UF262T, 673-7101, 52-1647, C1251SPEC, EBC1347, 26C1048, IGC0127, 920-1020, SKIC121, CUF262, 2IGC0199, 353N, 3-566, 8263, 82633, 8286, 82863, 48658\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\u003e2004 Buick Rainier 5.3L V8\u003c\/li\u003e\n  \u003cli\u003e2005 Buick Rainier 5.3L V8\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eFrequently Asked Questions \u0026amp; Fitment Warnings\u003c\/h3\u003e\n\u003ch4\u003eDoes this fit the GMT360 Rainier?\u003c\/h4\u003e\n\u003cp\u003eYes, this is a direct fit for the 2004-2005 Buick Rainier equipped with the \u003cstrong\u003e5.3L V8\u003c\/strong\u003e engine; it does not fit models equipped with the 4.2L inline-six (LL8) engine.\u003c\/p\u003e\n\n\u003ch4\u003eAre spark plug wires included with this kit?\u003c\/h4\u003e\n\u003cp\u003eNo, secondary spark plug wires are not included and must be inspected or sourced separately during service.\u003c\/p\u003e\n\n\u003ch3\u003eThe Buick Durability Standard\u003c\/h3\u003e\n\u003cp\u003eEngineered to handle heavy loads, steep grades, and long-distance towing, this ignition refresh ensures the robust Vortec V8 delivers unwavering torque reliability under real-world truck operating conditions.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":67556668145912,"sku":"DS-E437GTMW3","price":224.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0800\/1290\/2648\/files\/ignition-coil-spark-plugs-for-buick-rainier-2004-2005-5-3l-1.jpg?v=1790886828","url":"https:\/\/performancechiptuning.com\/es\/products\/ignition-coil-spark-plugs-for-buick-rainier-2004-2005-5-3l","provider":"Performance Chip Tuning","version":"1.0","type":"link"}