{"product_id":"x4xz-uf303-ignition-coil-5019-double-iridium-spark-plug-kit-6-pack-for-chevy-trailblazer-gm-2-8l-5-3l-direct-fit-reliabilit","title":"X4XZ UF303 Ignition Coil \u0026 5019 Double Iridium Spark Plug Kit — 6-Pack for Chevy Trailblazer \u0026 GM 2.8L–5.3L, Direct-Fit Reliabilit","description":"\u003cp\u003e\u003cstrong\u003eX4XZ UF303 ignition coils paired with 5019 double iridium spark plugs replace worn-out components to restore reliable ignition, smoother idling, and steady engine performance for compatible GM vehicles.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThis complete kit includes six ignition coil packs and six double iridium spark plugs designed as direct-fit replacements for a range of GM models including Chevy Trailblazer, GMC Envoy, Isuzu Ascender, Buick Rainier, Hummer H3, Oldsmobile Bravada, and Saab 9-7X. Each ignition coil and spark plug combination is engineered to meet or exceed original equipment specifications for fitment and electrical characteristics, simplifying installation while supporting dependable starts, consistent combustion, and reduced misfires.\u003c\/p\u003e\n\n\u003ch3\u003eWhich vehicles will these UF303 coils and 5019 plugs fit?\u003c\/h3\u003e\n\u003cp\u003eThe X4XZ kit targets mid-2000s GM-derived models with 2.8L–5.3L engines. Fitment covers multiple makes and model years; always cross-check your vehicle's VIN or original part numbers before ordering. The package replaces OE numbers like UF303 and commonly matched spark plug codes.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eChevy: Trailblazer\/Trailblazer EXT (2002–2005), Colorado (2004–2006)\u003c\/li\u003e\n  \u003cli\u003eGMC: Envoy\/Envoy XL\/XUV (2002–2005), Canyon (2004–2006)\u003c\/li\u003e\n  \u003cli\u003eIsuzu: Ascender (2003–2008), I-280\/I-290\/I-350\/I-370 models\u003c\/li\u003e\n  \u003cli\u003eAlso compatible: Buick Rainier (2004–2005), Hummer H3 (2006), Oldsmobile Bravada (2002–2004), Saab 9-7X (2005–2009)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow do the double iridium plugs and coils improve ignition reliability?\u003c\/h3\u003e\n\u003cp\u003eThe spark plugs use a dual iridium construction for a durable, precise firing tip that resists wear and maintains a steady spark over long service intervals. The ignition coils are made from robust materials with internal noise suppression and reinforced connectors to protect against heat and vibration, helping sustain strong spark energy under demanding conditions.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eDouble iridium tips extend service life and provide a consistent spark\u003c\/li\u003e\n  \u003cli\u003eFerrite noise suppressor reduces radio frequency interference\u003c\/li\u003e\n  \u003cli\u003eThermoplastic coil connectors resist heat-related cracking\u003c\/li\u003e\n  \u003cli\u003eStainless-steel springs ensure secure, conductive contact\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat symptoms will this kit resolve once installed?\u003c\/h3\u003e\n\u003cp\u003eReplacing worn coils and plugs often clears common ignition-related drivability issues. Expect improved cold starts, fewer engine misfires, steadier idle, and a smoother throttle response when the components are healthy and correctly installed.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eReduces or eliminates engine misfire codes\u003c\/li\u003e\n  \u003cli\u003eImproves idle stability and engine smoothness\u003c\/li\u003e\n  \u003cli\u003eHelps restore lost engine power and responsiveness\u003c\/li\u003e\n  \u003cli\u003ePromotes more consistent combustion cycle timing\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow straightforward is installation and what’s included?\u003c\/h3\u003e\n\u003cp\u003eThis kit is built as a direct replacement to match original mounting and electrical connections, making installation quick for most DIYers or professional mechanics. No printed manual is included, but basic steps are standard: disconnect battery, remove old coils and plugs, install new plugs to correct gap and torque, then fit coils and reconnect electrical plugs.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eIncluded: 6 ignition coil packs + 6 double iridium spark plugs\u003c\/li\u003e\n  \u003cli\u003eOE references: UF303, 12568062, 19300921 and related numbers\u003c\/li\u003e\n  \u003cli\u003eTools needed: socket set, torque wrench, spark plug socket\u003c\/li\u003e\n  \u003cli\u003eManufacturer support: 24-hour customer service and 1-year product coverage\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for: Drivers and mechanics working on compatible GM and GM-derived vehicles from the early-to-mid 2000s who want a cost-effective, OEM-equivalent ignition refresh. This kit suits owners experiencing misfires, rough idle, hard starts, or degraded throttle response, as well as vehicle restorers and fleet maintenance teams seeking reliable replacement coils and long-life iridium plugs.\u003c\/p\u003e\n\u003csection class=\"product-faq-snippet\"\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Are these UF303 coils compatible with my 2004 Trailblazer?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes, the X4XZ UF303 coils and 5019 plugs fit 2002–2005 Chevy Trailblazer models with the compatible 4.2L engines; verify against your VIN or OE part numbers.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: How long do the double iridium spark plugs typically last?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Double iridium plugs are designed for extended life; typical service intervals can reach around 100,000 kilometers depending on driving conditions.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"X4XZ","offers":[{"title":"Default Title","offer_id":48082893045918,"sku":"B0DNH7MV5C","price":124.98,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0781\/2041\/9486\/files\/x4xz-uf303-coil-and-5019-plug-front-packaging.jpg?v=1785818512","url":"https:\/\/northtrailauto.ca\/products\/x4xz-uf303-ignition-coil-5019-double-iridium-spark-plug-kit-6-pack-for-chevy-trailblazer-gm-2-8l-5-3l-direct-fit-reliabilit","provider":"North Trail Auto","version":"1.0","type":"link"}