Denso 4008 Spark Plug

Reliable Ignition Performance with Denso 4008 Spark Plug

The Denso 4008 spark plug from the U-Groove Conventional line offers consistent ignition performance designed for a range of vehicles. Engineered with a U-groove ground electrode tip and quality core materials, this spark plug supports efficient combustion and reliable engine operation.

• U-groove ground electrode tip design for improved spark exposure
• Nickel ground electrode core and tip for durability
• Copper center electrode core for optimal conductivity
• Standard ground configuration with a single ground electrode
• Flat seat type with 14.00 mm thread diameter and 12.70 mm reach
• Pre-gap size of 0.7 mm for precise spark gap
• Hex size of 16.0 mm for standard installation tools
• Manufacturer heat range of 22 suitable for various engine conditions

About the Denso U-Groove Conventional Spark Plug Line

The U-Groove Conventional product line by Denso focuses on delivering dependable ignition components with a unique U-groove ground electrode tip design. This design enhances spark exposure to the air-fuel mixture, promoting better combustion efficiency. The Denso 4008 spark plug incorporates this technology along with durable nickel and copper materials to maintain consistent performance in secondary ignition systems.

Technical Details and Specifications

The Denso 4008 spark plug features a nickel ground electrode core and tip, providing resistance to wear and corrosion. The copper center electrode core ensures excellent electrical conductivity, supporting stable ignition. With a pre-gap size of 0.7 mm and a single ground electrode, this spark plug is engineered for standard ignition systems requiring a flat seat and a 14.00 mm thread diameter. The 12.70 mm reach and 16.0 mm hex size facilitate compatibility with many vehicle engines. The manufacturer heat range of 22 indicates its suitability for moderate operating temperatures.

Common Applications and Problem Solving

• Restores consistent ignition in vehicles experiencing misfires
• Improves fuel combustion efficiency for smoother engine operation
• Addresses rough idling caused by worn or damaged spark plugs
• Reduces engine hesitation during acceleration
• Helps maintain optimal engine performance in compatible makes and models

Installation Notes and Tips

Ensure the spark plug gap is set to the specified 0.7 mm before installation. Use a 16.0 mm socket wrench for proper tightening to avoid damage to the flat seat. Verify thread diameter and reach compatibility with your vehicle’s engine specifications to prevent cross-threading or improper fit. It is recommended to replace spark plugs in sets to maintain balanced engine performance.

Quality Assurance and Warranty

Denso spark plugs, including the 4008 part number, are manufactured to meet strict quality standards for durability and performance. The use of nickel and copper materials supports long service life under normal operating conditions. While specific warranty details may vary, Denso products typically come with manufacturer-backed quality assurance to ensure reliability in secondary ignition applications.