Denso 4010 Spark Plug

Reliable Ignition with Denso U-Groove Conventional Spark Plug 4010

The Denso U-Groove Conventional Spark Plug 4010 is engineered to deliver consistent ignition performance for a variety of vehicles. Designed with a U-groove ground electrode tip and quality core materials, this spark plug supports efficient combustion and engine reliability.

• U-groove ground electrode tip design for improved spark exposure
• Nickel ground electrode and center electrode tips for durability
• Copper center electrode core for enhanced 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 optimized for ignition efficiency
• Hex size of 16.0 mm for standard installation tools
• Manufacturer heat range rating of 24 for balanced thermal performance
• Resistance of 5000 ohms to reduce electrical noise interference

About the U-Groove Conventional Product Line

The Denso U-Groove Conventional spark plug line features a unique U-shaped groove on the ground electrode tip, which increases the spark exposure area. This design helps improve ignition reliability and combustion efficiency in conventional spark plug applications. The 4010 part number is part of this line, combining traditional spark plug construction with enhanced electrode design for steady engine performance.

Technical Details and Application

The Denso 4010 spark plug incorporates a copper core center electrode for excellent thermal conductivity, paired with nickel tips on both the center and ground electrodes to resist wear. The single ground electrode with a U-groove tip design allows for better spark distribution and flame kernel development. With a flat seat and a thread diameter of 14.00 mm, this spark plug fits many vehicles requiring these specifications. The pre-gap of 0.7 mm is set to optimize ignition timing and combustion efficiency, while the heat range of 24 ensures the plug operates within the correct temperature window to prevent fouling or overheating.

Compatible Vehicles and Common Issues Addressed

• Compatible with various makes and models requiring a 14 mm thread diameter and 12.7 mm reach spark plug
• Helps resolve misfires caused by electrode wear or improper spark exposure
• Reduces ignition noise interference with 5000 ohm resistance
• Addresses rough idling and poor acceleration due to spark plug degradation
• Supports stable combustion to improve fuel efficiency and emissions

Installation Notes and Tips

When installing the Denso 4010 spark plug, ensure the pre-gap of 0.7 mm is maintained or adjusted according to the vehicle manufacturer’s specifications. Use a 16 mm socket wrench for proper tightening torque to avoid damage to the flat seat. It is recommended to inspect the spark plug threads and clean the cylinder head threads before installation to ensure proper fitment and sealing.

Quality Assurance and Warranty

Denso spark plugs are manufactured to meet strict quality standards for durability and performance. The U-Groove Conventional 4010 spark plug undergoes rigorous testing to ensure consistent ignition and resistance to electrode wear. While specific warranty details may vary by distributor, Denso products typically come with a limited warranty covering manufacturing defects.