Denso 4709 Spark Plug

Reliable Ignition Performance for Multiple Vehicle Makes

The Denso Iridium TT 4709 spark plug is engineered to deliver consistent ignition performance across a wide range of vehicles including Audi, Ford, Honda, Toyota, and Volkswagen models. Designed with advanced materials and a precise electrode configuration, this spark plug supports efficient combustion and engine responsiveness.

• Iridium center electrode tip for enhanced durability and ignition
• Platinum twin-tip ground electrode design for improved spark stability
• Copper core center electrode for optimal conductivity
• Flat seat type with 14mm thread diameter and 19mm reach for secure fitment
• Pre-gap size of 1.0 mm for precise spark gap
• Heat range rating of 20 suitable for various engine conditions
• Hex size of 20.6 mm for easy installation

Advanced Iridium TT Technology for Improved Ignition

The Iridium TT line from Denso combines iridium and platinum materials to enhance spark plug longevity and ignition efficiency. The twin-tip ground electrode design reduces quenching and promotes a more stable spark, which can improve throttle response and fuel efficiency. The copper core center electrode ensures excellent thermal conductivity, helping maintain consistent performance under different driving conditions. This makes the Denso Iridium TT 4709 spark plug a suitable choice for vehicles requiring reliable secondary ignition components.

Technical Specifications and Compatibility

This spark plug features a nickel ground electrode core with a platinum twin-tip design, providing durability and resistance to electrode wear. The single ground electrode configuration and flat seat type ensure proper sealing and fitment. With a thread diameter of 14.00 mm and a reach of 19.00 mm, it is compatible with a variety of models such as the Honda Accord, Ford Mustang, Toyota Camry, Volkswagen Jetta, and Audi 4000 Quattro. The manufacturer heat range of 20 supports stable operation in moderate to high-temperature environments.

Common Applications and Problem Solving

• Restores engine misfire issues caused by worn or damaged spark plugs
• Improves cold start performance in vehicles like the Nissan 240SX and Subaru Impreza
• Enhances fuel efficiency and reduces emissions in models such as the Chevrolet Camaro and Mazda 626
• Maintains consistent ignition in high-performance vehicles including the Porsche 911 and Jaguar XJ12
• Reduces rough idling and hesitation in daily drivers like the Hyundai Sonata and Mitsubishi Eclipse

Installation Notes and Tips

Before installation, verify the spark plug gap is set to the recommended 1.0 mm pre-gap size. Use a torque wrench to tighten the spark plug to the manufacturer’s specifications to avoid damage to the threads or improper sealing. The 20.6 mm hex size allows for standard spark plug socket compatibility. It is advisable to inspect the ignition system components and replace spark plugs in sets to maintain balanced engine performance.

Quality Assurance and Warranty

Denso manufactures the Iridium TT 4709 spark plug to meet strict quality standards, ensuring reliable secondary ignition performance. The use of premium materials such as iridium and platinum contributes to extended service life and consistent operation. While specific warranty details may vary, Denso products typically come with a limited warranty covering defects in materials and workmanship.