NGK 4904 Spark Plug

Reliable Ignition Performance for Lexus and Toyota Vehicles

The NGK Laser Iridium Spark Plug 4904 is engineered to deliver consistent ignition and efficient combustion for select Lexus and Toyota models. Designed with durable materials and precise specifications, this spark plug supports optimal engine performance and fuel efficiency.

• Iridium center electrode tip for enhanced durability and ignition
• Copper core center electrode for improved conductivity
• Standard ground electrode with nickel core material
• Non-removable nut electrical terminal type for secure connection
• Pre-gap size of 0.044 inches for precise spark gap
• Flat seat type with 14.00 mm thread diameter and 26.5 mm reach
• Hex size of 5/8 inch for easy installation
• Manufacturer heat range rating of 6

About the NGK Laser Iridium Spark Plug Line

The Laser Iridium Spark Plug line from NGK combines iridium's high melting point and fine electrode design to provide stable ignition and longer service life. This technology reduces electrode wear and maintains consistent spark performance, making it suitable for demanding ignition conditions in vehicles like the Lexus GX460 and Toyota Tundra.

Technical Details and Specifications

This NGK spark plug features a single ground electrode with a standard tip design made from nickel, paired with a copper core center electrode tipped with iridium. The 0.044-inch pre-gap ensures optimal spark delivery, while the flat seat and 14 mm thread diameter provide a secure fit. The 26.5 mm reach and 5/8 inch hex size facilitate compatibility and installation in various Lexus and Toyota engines. The non-removable nut terminal type enhances electrical connection reliability.

Compatible Vehicles and Applications

• Lexus 4Runner, GX460, LX570
• Toyota FJ Cruiser, Land Cruiser, Sequoia, Tacoma, Tundra
• Designed for secondary ignition systems requiring precise spark plug specifications
• Suitable for engines needing a heat range of 6

Common Issues Addressed by NGK Laser Iridium Spark Plug 4904

• Misfires caused by worn or degraded spark plugs
• Reduced fuel efficiency due to inconsistent ignition
• Difficulty starting engines in cold or demanding conditions
• Engine hesitation or rough idling
• Premature electrode wear affecting spark quality

Installation Notes and Tips

Ensure the engine is cool before removing old spark plugs. Use a torque wrench to tighten the NGK 4904 spark plug to manufacturer specifications to avoid damage. The 5/8 inch hex size allows for standard spark plug socket use. Verify the pre-gap of 0.044 inches before installation if adjustments are necessary. The flat seat design requires proper seating to prevent compression leaks.

Quality Assurance and Warranty

NGK spark plugs are manufactured to meet strict quality standards, ensuring reliable performance and durability. The Laser Iridium Spark Plug 4904 undergoes rigorous testing for electrical resistance and heat range compliance. While specific warranty details vary by region, NGK typically offers coverage against manufacturing defects to support customer confidence.