X4XZ Ignition Coil and Double-Iridium Spark Plug Kit for Toyota Tundra 4.7L — 8-Coil/8-Plug Set, OE-Fit for V8

This X4XZ kit delivers a full ignition refresh for compatible Toyota and Lexus V8 engines, combining coil packs designed to match or improve original equipment with long-life double-iridium spark plugs. The components are engineered to reduce misfires, support consistent combustion and simplify replacement with OE-equivalent fitment. Use this kit when you need to replace multiple coils and plugs at once to reduce diagnostic repeats and get the engine operating smoothly again.

What vehicles and engines does this kit fit?

The kit is built for several Toyota and Lexus V8 models with 4.3L, 4.7L, and selected 5.7L engines across late 1990s through 2010 model years. Confirm fitment against your VIN or the vehicle list before purchase to ensure compatibility.

• Toyota: Tundra (2000–2009) 4.7L, Sequoia (2001–2009) 4.7L, 4Runner (2003–2009) 4.7L, Land Cruiser (1998–2007) 4.7L
• Lexus: GS430, LS430, SC430 (2001–2006/2010 depending on model) and GX470/LX470 (various years), LX570 (2008–2009)
• Check images or dealer data for full vehicle-year coverage and part number match

How do these coils and plugs improve engine performance?

Each ignition coil and double-iridium spark plug is designed to deliver more consistent high-voltage spark and durability compared with worn OEM parts. That consistency helps reduce rough idle and intermittent misfire symptoms without requiring tuning or special programming.

• Double-iridium electrodes offer extended service life and stable spark across the set
• Coils include stainless-steel springs and ferrite noise suppressors for reliable transfer and low EMI
• Thermoplastic connectors resist heat cycling to prevent connector fractures over time

What comes in the package and which part numbers are covered?

The kit ships with eight ignition coil packs and eight double-iridium spark plugs so you can replace all cylinders at once. The parts are made to match OE references and common replacement numbers to simplify ordering and installation.

• Included: Ignition Coil Packs x8 and Double Iridium Spark Plugs x8
• OE/replace numbers covered: UF230 + 4504 and many cross-references such as 90919-02230, 90919-02259, IC336, UF-493, and others
• No printed manual included; straightforward swap for familiar DIY or mechanic installation

What warranty and support does X4XZ provide?

X4XZ backs this kit with customer support and a limited product service period to address installation or quality issues. Reach out through the brand’s customer channels for troubleshooting guidance or warranty claims.

• 24-hour customer service response available
• 1-year product service coverage for defects or fitment concerns
• Customer assistance for installation questions or replacement guidance

Who this is for: This eight-cylinder ignition coil and plug kit is ideal for Toyota and Lexus owners, independent mechanics, and fleet technicians who need a complete replacement solution for 4.3L–4.7L V8 engines (and select 5.7L applications). Choose this set when multiple cylinders are showing ignition-related faults, during a scheduled tune-up for high-mile vehicles, or when you prefer replacing all coils and plugs at once to restore consistent starting and running behavior.