Denso 4124 Spark Plug

Reliable Spark Plug for Jeep Cherokee and Classic Models

The Denso 4124 spark plug is engineered to deliver consistent ignition performance for Jeep vehicles including the Cherokee, CJ5, CJ7, J10, and Wagoneer. Designed with a U-groove ground electrode tip, this spark plug supports efficient combustion and reliable engine operation.

• U-groove ground electrode tip design for improved spark exposure
• Nickel ground and center electrode tips with copper core for durability and conductivity
• Standard ground configuration with a single ground electrode
• Flat seat type with 14.00 mm thread diameter and 19.00 mm reach
• Pre-gap size of 1.0 mm and manufacturer heat range of 16
• Hex size of 20.6 mm for standard installation tools
• Resistance rating of 5000 ohms to reduce electrical interference

About the Denso U-Groove Conventional Spark Plug Line

The U-Groove Conventional line from Denso focuses on spark plugs featuring a unique U-groove ground electrode tip design. This design enhances the spark exposure area, promoting better ignition and combustion efficiency. The Denso 4124 spark plug is part of this line, combining conventional materials like nickel and copper to balance durability and conductivity for secondary ignition systems.

Technical Details and Performance Features

The Denso 4124 spark plug incorporates a nickel ground electrode tip and a copper core center electrode with a nickel tip, providing a reliable conduction path and resistance to electrode wear. The single ground electrode with a U-groove design increases the spark area, which can improve ignition reliability in Jeep engines. With a flat seat and a 19.00 mm reach, this spark plug fits securely in the combustion chamber, ensuring proper sealing and heat dissipation. The 5000 ohm resistance helps minimize radio frequency interference, supporting stable engine electronics.

Compatible Applications and Common Issues Addressed

• Compatible with Jeep Cherokee, CJ5, CJ7, J10, and Wagoneer models
• Helps resolve misfires caused by worn or damaged spark plugs
• Improves cold start performance and throttle response
• Reduces engine hesitation and rough idling
• Supports consistent ignition timing for smoother engine operation

Installation Notes and Tips

Ensure the spark plug gap is set to the specified 1.0 mm pre-gap before installation. Use a 20.6 mm socket wrench for proper tightening torque to avoid damage to the electrode or threads. Verify the flat seat type matches the engine’s cylinder head design to ensure a proper seal. Always install spark plugs when the engine is cool to prevent thread damage.

Quality Assurance and Warranty Information

Denso spark plugs are manufactured to meet strict quality standards for secondary ignition components. The 4124 part number undergoes rigorous testing to ensure durability and performance in Jeep vehicles. While specific warranty details are not provided, Denso products typically come with manufacturer-backed quality assurance to support reliable operation.