Denso 5378 Spark Plug

Reliable Ignition Performance with Denso Iridium Power Spark Plug 5378

The Denso Iridium Power spark plug 5378 is engineered to deliver consistent ignition and improved combustion efficiency. Designed with advanced materials and precise specifications, this spark plug supports optimal engine performance for various vehicle makes and models.

• Iridium center electrode tip for enhanced durability and ignition
• Tapercut, u-groove ground electrode tip design for better spark exposure
• Copper core center electrode for efficient heat dissipation
• Nickel ground electrode core material with standard ground configuration
• Flat seat type with 14.00 mm thread diameter and 12.70 mm reach
• Pre-gap size of 0.8 mm and manufacturer heat range of 20
• Hex size of 20.6 mm for standard installation tools

Detailed Features of Denso Iridium Power 5378 Spark Plug

The Denso Iridium Power 5378 spark plug incorporates a copper core center electrode with an iridium tip, which provides a balance of excellent conductivity and long-lasting wear resistance. The tapercut, u-groove ground electrode tip design improves spark exposure, contributing to more efficient combustion. The nickel ground electrode core ensures durability under high temperatures, while the flat seat type and precise thread diameter of 14.00 mm guarantee a secure fit in compatible engines. With a pre-gap size of 0.8 mm and a manufacturer heat range of 20, this spark plug is optimized for stable ignition and heat management.

About the Denso Iridium Power Product Line

The Iridium Power line from Denso focuses on delivering spark plugs that combine iridium's high melting point with advanced electrode designs. This product line aims to improve ignition reliability and fuel efficiency while maintaining durability under demanding engine conditions. The 5378 spark plug is part of this line, offering features tailored to secondary ignition systems requiring precise electrode configurations and heat ranges.

Common Applications and Issues Addressed

• Replacement for worn or fouled spark plugs causing misfires
• Improving ignition stability in vehicles experiencing rough idling
• Addressing poor fuel economy due to incomplete combustion
• Resolving hard starts related to weak spark generation
• Maintaining engine performance in models requiring a heat range of 20

Installation Notes and Tips

Ensure the spark plug gap is set to the specified 0.8 mm before installation. Use a 20.6 mm hex socket for proper tightening torque to avoid damage to the electrode or threads. Confirm compatibility with your vehicle’s make and model by checking thread diameter and reach specifications. Avoid over-tightening to maintain the flat seat integrity and prevent sealing issues.

Quality Assurance and Warranty

Denso manufactures the Iridium Power 5378 spark plug to meet strict quality standards, ensuring consistent performance and durability. While specific warranty details are not provided, Denso products typically adhere to industry standards for reliability and material quality.