Denso 4135 Spark Plug

Reliable Ignition Performance with Denso U-Groove Conventional Spark Plug

The Denso U-Groove Conventional Spark Plug 4135 is engineered to deliver consistent ignition performance for a variety of vehicle applications. Designed with a multi-electrode ground configuration and quality core materials, this spark plug supports efficient combustion and engine reliability.

• Multi-electrode ground configuration with 2 ground electrodes for improved spark distribution
• Nickel ground electrode tip and center electrode tip for durability
• Copper center electrode core material for enhanced conductivity
• Pre-gap size of 0.7 mm optimized for ignition efficiency
• Flat seat type with 14 mm thread diameter and 19 mm reach for precise fitment
• Hex size of 16.0 mm for standard installation tools
• Manufacturer heat range of 31 suitable for moderate engine temperatures
• Resistance of 5000 ohms to reduce electrical interference

About the U-Groove Conventional Product Line

The Denso U-Groove Conventional spark plug line features a unique groove design on the center electrode that enhances spark exposure and combustion efficiency. This design helps improve ignition reliability and fuel efficiency in compatible vehicles. The 4135 part number belongs to this line, offering a balance of conventional spark plug technology with advanced electrode materials.

Technical Details and Application

The Denso 4135 spark plug incorporates a multi-electrode ground configuration with two nickel ground electrodes and a copper core center electrode tipped with nickel. This combination ensures stable spark generation and durability under typical operating conditions. The flat seat and 19 mm reach provide a secure fit in engines requiring these specifications. The 5000 ohm resistance helps minimize radio frequency interference, making it suitable for vehicles with sensitive electronic systems.

Common Issues Addressed by Denso 4135 Spark Plug

• Misfires caused by worn or inefficient spark plugs
• Reduced fuel efficiency due to incomplete combustion
• Engine hesitation or rough idling
• Difficulty starting the engine in cold conditions
• Electrical interference affecting onboard electronics

Installation Notes and Tips

Ensure the spark plug gap is set to the specified 0.7 mm pre-gap before installation. Use a 16 mm socket wrench for proper tightening to avoid damage to the electrodes or threads. Verify compatibility with your vehicle’s make and model by checking thread diameter (14 mm) and reach (19 mm) specifications. Proper torque application is essential to maintain the flat seat seal and prevent combustion leaks.

Quality Assurance and Warranty

Denso spark plugs, including the U-Groove Conventional 4135, are manufactured to meet strict quality standards for durability and performance. While specific warranty details may vary by distributor, Denso products typically come with a limited warranty covering manufacturing defects. Always consult your vehicle’s service manual and Denso’s warranty policy for detailed information.