Denso 3473 Spark Plug

Reliable Ignition Performance for Lexus Vehicles

The Denso Iridium Long Life (SIP) spark plug, part number 3473, is engineered to deliver consistent ignition performance for a range of Lexus models. Designed with advanced materials and precise specifications, this spark plug supports efficient combustion and engine reliability.

• Iridium center electrode tip for enhanced durability
• Platinum needle ground electrode tip with needle-to-needle configuration
• Three ground electrodes for improved spark stability
• Copper core center electrode for optimal conductivity
• Flat seat type with 14.00 mm thread diameter and 26.50 mm reach
• Pre-gap size of 1.1 mm for precise ignition timing
• Manufacturer heat range rating of 20
• Hex size of 16.0 mm for standard installation tools

About the Iridium Long Life (SIP) Product Line

The Iridium Long Life (SIP) line from Denso focuses on delivering extended service life and consistent ignition quality. Utilizing iridium and platinum materials in the electrode tips, these spark plugs are designed to withstand high temperatures and resist wear, making them suitable for modern Lexus engines that demand reliable secondary ignition components.

Technical Details and Benefits

This spark plug features a copper core center electrode with an iridium tip, which provides excellent electrical conductivity and durability. The ground electrode uses a platinum needle tip arranged in a needle-to-needle configuration with three ground electrodes, enhancing spark efficiency and combustion stability. The nickel core material in the ground electrodes contributes to structural strength. With a pre-gap size of 1.1 mm and a flat seat design, the Denso 3473 spark plug ensures proper fitment and ignition timing for compatible Lexus models.

Compatible Lexus Models

• Lexus GS300, GS350, GS450h, GS460
• Lexus IS250, IS300, IS350, IS F
• Lexus LS460, LS600h
• Lexus RC300, RC350

Common Issues Addressed by This Spark Plug

• Misfiring or rough idling in Lexus GS and IS series
• Reduced fuel efficiency due to inconsistent spark
• Difficulty starting or engine hesitation
• Premature electrode wear affecting ignition timing
• Engine performance loss in Lexus LS and RC models

Installation Notes and Tips

Ensure the spark plug gap is set to the specified 1.1 mm before installation. Use a 16.0 mm socket wrench for proper torque application. The flat seat design requires careful seating to avoid damage to the cylinder head. Always follow the vehicle manufacturer’s torque specifications and installation procedures to maintain optimal performance.

Quality Assurance and Warranty

Denso spark plugs are manufactured to meet strict quality standards, ensuring reliable ignition performance and durability. While specific warranty details for part number 3473 are not provided here, Denso products typically come with manufacturer-backed quality assurance. Refer to the vehicle or part documentation for warranty information.