Denso 5373 Spark Plug

Overview of Denso Iridium Power Spark Plug 5373

The Denso Iridium Power spark plug 5373 is engineered for precision ignition performance in select Ferrari and Lamborghini models. Designed with advanced materials and a specialized electrode configuration, this spark plug supports efficient combustion and reliable engine operation.

• Iridium center electrode tip for enhanced durability and ignition
• Tapercut, u-groove ground electrode tip design for improved spark exposure
• Copper core center electrode for optimal conductivity
• Nickel ground electrode core material with standard ground configuration
• Pre-gap size of 0.8 mm for precise spark gap
• Flat seat type with 19.00 mm reach and 12.00 mm thread diameter
• Hex size of 18.0 mm for installation compatibility
• Manufacturer heat range rating of 27
• Resistance rating of 5000 ohms to reduce electrical noise

Iridium Power Product Line Details

The Iridium Power line by Denso focuses on delivering spark plugs with iridium-tipped electrodes that provide a balance of durability and performance. This product line is designed to improve ignition efficiency and maintain stable combustion, which is critical for high-performance vehicles such as the Ferrari 348 GTS and Lamborghini Diablo. The use of iridium in the center electrode tip enhances wear resistance compared to conventional plugs.

Technical Description and Compatibility

This Denso spark plug 5373 features a copper core center electrode that ensures excellent thermal conductivity, helping to maintain optimal operating temperatures. The nickel ground electrode with a tapercut, u-groove tip design increases spark exposure, promoting better ignition and combustion stability. The flat seat and 19.00 mm reach make it suitable for specific engine configurations found in Ferrari 348 TS, Mondial 3.2, Mondial t, and Testarossa models, as well as Lamborghini Diablo. The 5000 ohm resistance helps minimize electromagnetic interference with vehicle electronics.

Applications and Problem Solving

• Compatible with Ferrari 348 GTS, 348 TS, Mondial 3.2, Mondial t, Testarossa
• Compatible with Lamborghini Diablo
• Addresses misfires caused by worn or damaged spark plugs
• Improves cold start performance and throttle response
• Reduces engine hesitation and rough idling
• Helps maintain fuel efficiency by ensuring consistent ignition

Installation Notes and Tips

When installing the Denso Iridium Power spark plug 5373, ensure the pre-gap size of 0.8 mm is maintained or adjusted according to manufacturer specifications. Use a torque wrench to tighten the spark plug to the recommended torque to avoid damage to the flat seat or thread. The 18.0 mm hex size allows for standard spark plug socket compatibility. Inspect the spark plug hole for debris before installation to ensure proper seating and sealing.

Quality Assurance and Warranty

Denso spark plugs, including the Iridium Power 5373, are manufactured to meet strict quality standards for durability and performance. The use of premium materials such as iridium and copper ensures long service life under demanding conditions. While specific warranty details may vary, Denso products typically come with manufacturer-backed quality assurance to support reliable operation in compatible Ferrari and Lamborghini vehicles.