Denso 4004 Spark Plug

Reliable Ignition Performance with Denso 4004 Spark Plug

The Denso 4004 spark plug delivers consistent ignition performance designed for a range of vehicle applications. Featuring a U-groove ground electrode tip and durable materials, this spark plug supports efficient combustion and engine reliability.

• U-groove ground electrode tip design for improved spark exposure
• Nickel ground electrode core and center electrode 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 20 suitable for various engine conditions

About the Denso U-Groove Conventional Product Line

The Denso U-Groove Conventional spark plug line is engineered to provide reliable secondary ignition performance with a unique U-groove ground electrode tip. This design enhances spark exposure to the air-fuel mixture, promoting efficient combustion. The conventional construction balances durability and conductivity, making it suitable for many gasoline engines requiring standard heat range plugs.

Technical Details and Material Composition

The Denso 4004 spark plug features a copper core center electrode that ensures excellent thermal conductivity and consistent spark delivery. The nickel material used for both the ground electrode core and center electrode tip offers resistance to wear and corrosion. The single ground electrode with a U-groove tip design increases the spark area, which can improve ignition reliability. With a flat seat and a thread diameter of 14.00 mm, this spark plug fits applications requiring a 12.70 mm reach and a 0.7 mm pre-gap size.

Applications and Common Issues Addressed

• Compatible with vehicles requiring a 14 mm thread diameter spark plug
• Addresses misfires caused by worn or damaged spark plugs
• Helps restore engine starting performance and smooth idling
• Reduces incomplete combustion issues related to spark exposure
• Suitable for engines needing a heat range 20 spark plug

Installation Notes and Tips

Ensure the spark plug gap is set to 0.7 mm before installation if adjustment is necessary. Use a 16 mm socket wrench for proper tightening torque to avoid damage to the plug or cylinder head. Verify compatibility with your vehicle’s make and model by checking thread diameter, reach, and seat type specifications. Avoid over-tightening to maintain the integrity of the flat seat and prevent thread damage.

Quality Assurance and Warranty

Denso spark plugs, including the 4004 part number, are manufactured to meet strict quality standards for ignition components. The use of copper and nickel materials ensures durability and consistent performance under normal operating conditions. While specific warranty details may vary, Denso products typically come with manufacturer-backed quality assurance to support reliable engine operation.