Denso 4708 Spark Plug

Overview of Denso Iridium TT Spark Plug 4708

The Denso Iridium TT spark plug 4708 is engineered for reliable ignition performance across a wide range of vehicles including BMW, Ford, Honda, Toyota, and Volkswagen models. Designed to deliver consistent spark and efficient combustion, this spark plug supports optimal engine operation in both everyday driving and demanding conditions.

• Iridium center electrode tip for enhanced durability and ignition
• Platinum twin-tip ground electrode design for improved spark efficiency
• Copper core center electrode for superior conductivity
• Flat seat type with 14mm thread diameter and 19mm reach
• Pre-gap size of 1.0 mm for precise spark gap
• Hex size of 20.6 mm for standard installation tools
• Manufacturer heat range rating of 16 for balanced thermal performance

Detailed Features and Specifications

The Denso Iridium TT 4708 spark plug features a copper core center electrode with an iridium tip, which provides a strong and stable spark while maintaining electrode longevity. The ground electrode uses a nickel core with a platinum twin-tip design, enhancing spark exposure and reducing misfires. This twin-tip ground configuration improves ignition reliability and fuel efficiency. The spark plug has a resistance rating of 5000 ohms, helping to suppress electrical noise and ensure smooth engine operation.

With a flat seat type and a thread diameter of 14.00 mm, this spark plug fits securely in compatible engines. The 19.00 mm reach and 1.0 mm pre-gap size are optimized for precise ignition timing and combustion. The hex size of 20.6 mm allows for easy installation using common spark plug sockets.

About the Iridium TT Brand Line

The Denso Iridium TT line is designed to combine the durability of iridium with the efficiency of a twin-tip ground electrode. This combination aims to improve ignition performance and fuel economy while extending spark plug life. The Iridium TT spark plugs are suitable for a variety of secondary ignition applications, making them a versatile choice for many vehicle makes and models.

Compatible Vehicles and Applications

This spark plug is compatible with numerous makes and models, including but not limited to BMW 318i, 325i, and 535i; Ford Mustang and F-150; Honda Accord and Civic; Toyota Camry and Corolla; and Volkswagen Jetta and Passat. The Denso Iridium TT 4708 is suitable for vehicles requiring a 14 mm thread diameter and a 19 mm reach spark plug with a heat range of 16.

• Resolves engine misfires and rough idling
• Improves cold start performance
• Enhances fuel efficiency and combustion stability
• Reduces spark plug fouling and wear
• Supports consistent ignition in high-performance engines

Installation Notes and Tips

Before installation, verify the spark plug gap is set to 1.0 mm as specified. Use a torque wrench to tighten the spark plug to the manufacturer’s recommended torque to avoid damage to the threads or seat. The 20.6 mm hex size allows for standard spark plug sockets. Inspect the spark plug hole for debris before installation to ensure proper seating and sealing.

Quality Assurance and Warranty

Denso spark plugs, including the Iridium TT 4708, are manufactured to meet strict quality standards for durability and performance. While specific warranty details may vary, Denso typically offers coverage against manufacturing defects. Using this spark plug helps maintain engine reliability and ignition system integrity in compatible BMW, Ford, Honda, Toyota, and Volkswagen vehicles.