NGK 7397 Spark Plug

NGK Iridium IX Spark Plug Overview

The NGK Iridium IX Spark Plug 7397 is engineered for reliable ignition performance across a wide range of vehicles including Ford, Chevrolet, Audi, and Mercedes-Benz models. Designed with advanced materials and precise specifications, this spark plug supports efficient combustion and consistent engine operation.

• Iridium center electrode tip for enhanced durability and ignition
• Taper cut ground electrode tip design for improved spark exposure
• Copper core center electrode for optimal conductivity
• Standard ground configuration with nickel ground electrode core
• Non-removable nut electrical terminal type for secure connection
• Pre-gap size of 0.040 inches for precise spark gap
• Tapered seat type and 5/8 inch hex size for proper fitment
• Manufacturer heat range 5 suitable for various engine conditions
• Thread diameter of 14 mm and reach of 0.708 inches for compatibility

Iridium IX Spark Plug Product Line Details

The Iridium IX Spark Plug line by NGK is designed to provide enhanced ignition performance and longer service life compared to conventional spark plugs. Featuring an iridium center electrode tip, this product line offers improved wear resistance and stable spark delivery, which is critical for maintaining engine efficiency in vehicles such as the Chevrolet Silverado, Ford F-150, and Audi 9-7x. The 7397 part number belongs to this line, ensuring consistent quality and fitment for secondary ignition systems.

Technical Description and Applications

The NGK 7397 spark plug incorporates a copper core center electrode that promotes excellent electrical and thermal conductivity, paired with an iridium tip that resists erosion. The taper cut ground electrode tip design increases spark exposure, contributing to more complete combustion. With a resistance rating of 5000 ohms, this spark plug helps reduce electromagnetic interference. Its tapered seat and 14 mm thread diameter ensure proper sealing and fitment in compatible engines.

Compatible Vehicles and Use Cases

• Replacement spark plug for Ford F-150, Chevrolet Silverado, and GMC Sierra models
• Suitable for ignition systems in Audi 9-7x and Mercedes-Benz 300SE vehicles
• Addresses issues such as misfires, rough idling, and poor fuel economy
• Helps restore engine responsiveness and smooth acceleration
• Ideal for vehicles requiring a heat range 5 spark plug with a 0.040 inch pre-gap

Installation Notes and Tips

Before installation, verify the spark plug gap is set to 0.040 inches as specified. Use a torque wrench to tighten the spark plug to the manufacturer’s recommended torque to avoid damage to the tapered seat. The non-removable nut electrical terminal type requires compatible ignition wires or boots. Inspect the spark plug threads and cylinder head for cleanliness to ensure proper sealing and performance.

Quality Assurance and Warranty

NGK spark plugs, including the Iridium IX 7397, are manufactured to meet strict quality standards for durability and performance. The use of premium materials such as iridium and copper ensures long service life under normal operating conditions. While specific warranty details may vary, NGK products typically come with manufacturer-backed quality assurance to support reliable ignition system operation.