{"product_id":"ignition-coil-and-iridium-spark-plugs-for-gmc-canyon-2004-2006-2-8l","title":"Ignition Coil and Iridium Spark Plugs for GMC Canyon (2004-2006) 2.8L","description":"\u003ch2\u003eDirect-Fit Ignition Coil and Iridium Spark Plug Kit for 2004-2006 GMC Canyon\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat it Does:\u003c\/strong\u003e The ignition coil and iridium spark plug kit restores secondary ignition voltage and resolves combustion misfires on the 2004-2006 GMC Canyon 2.8L to optimize idle stability, engine response, and under-load fuel efficiency.\u003c\/p\u003e\n\n\u003ch3\u003eThe Stock GMC Canyon Secondary Ignition Breakdown\u003c\/h3\u003e\n\u003cp\u003eThe factory coil-on-plug setup on the \u003cstrong\u003eGMT355\u003c\/strong\u003e chassis frequently suffers from dielectric breakdown due to intense thermal cycling within the narrow cylinder head spark plug wells of the \u003cstrong\u003eVortec 2800 (LK5)\u003c\/strong\u003e engine. Over time, the factory epoxy resin degrades and forms micro-fractures, allowing high-voltage flashover to the cylinder head rather than the electrode. Simultaneously, standard copper or worn platinum plugs exhibit rapid electrode erosion, expanding the gap beyond factory specification. This increased gap forces the aging coil pack to work harder to bridge the threshold, eventually burning out primary windings, triggering P0300-series misfire trouble codes, and causing hesitation during acceleration.\u003c\/p\u003e\n\n\u003ch3\u003eThe Engineering Solution\u003c\/h3\u003e\n\u003cp\u003eThis refresh kit replaces worn electronics with four upgraded coil-on-plug units and four laser-welded iridium spark plugs. The replacement coils utilize high-grade magnetic steel cores paired with thermal-resistant epoxy potting to resist under-hood heat soak and combat internal shorting. Premium high-dielectric silicone boots prevent voltage leakage and resist carbon tracking along the ceramic insulator. Matched with fine-wire iridium center electrodes, this combination requires significantly lower firing voltage while yielding faster flame kernel propagation, ensuring consistent combustion under tow loads or wide-open throttle conditions.\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; margin-bottom: 20px;\"\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;\"\u003e2004-2006 GMC Canyon\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;\"\u003e2.8L LK5 I4 \/ GMT355\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;\"\u003e175 hp \/ 185 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\u003eUF303\u003c\/strong\u003e, \u003cstrong\u003e68070492AB\u003c\/strong\u003e, \u003cstrong\u003e68070492AC\u003c\/strong\u003e, \u003cstrong\u003e68070492AD\u003c\/strong\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eCompatibility\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e2004 GMC Canyon (Base, SLE, Z85, Z71) - 2.8L L4 Gas\u003c\/li\u003e\n  \u003cli\u003e2005 GMC Canyon (Base, SLE, Z85, Z71) - 2.8L L4 Gas\u003c\/li\u003e\n  \u003cli\u003e2006 GMC Canyon (Base, SL, SLE, WT, Z85, Z71) - 2.8L L4 Gas\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eDoes this fit the GMT355 Canyon?\u003c\/strong\u003e\u003cbr\u003e Yes, this is a direct fit for the 2004-2006 GMC Canyon equipped with the 2.8L LK5 engine.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eAre the included iridium spark plugs pre-gapped?\u003c\/strong\u003e\u003cbr\u003e Yes, the plugs arrive pre-gapped to factory specification, but verifying gap clearance prior to installation is always standard practice.\u003c\/p\u003e\n\n\u003ch3\u003eThe GMC Workhorse Standard\u003c\/h3\u003e\n\u003cp\u003eBuilt to handle genuine utility demands, this ignition package delivers the durable, uncompromised spark energy required to keep your truck running clean under heavy bed payloads and sustained highway towing.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":50593970782456,"sku":"DS-E7EF8DBVH","price":99.95,"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-gmc-canyon-2004-2006-2-8l-1.jpg?v=1790054835","url":"https:\/\/performancechiptuning.com\/products\/ignition-coil-and-iridium-spark-plugs-for-gmc-canyon-2004-2006-2-8l","provider":"Performance Chip Tuning","version":"1.0","type":"link"}