NGK 5688 Spark Plug

NGK Iridium IX Spark Plug Overview

The NGK Iridium IX Spark Plug 5688 is engineered for reliable ignition performance in select Geo, Saab, and Toyota vehicles. Designed with advanced materials and precise specifications, this spark plug supports efficient combustion and engine responsiveness.

• Iridium center electrode tip for enhanced durability
• 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 0.032 inches for precise spark gap
• Flat seat type with 0.75-inch reach and 14mm thread diameter
• Hex size of 5/8 inch for installation compatibility
• Manufacturer heat range rating of 5

Detailed Product Description

The NGK Iridium IX Spark Plug 5688 features a copper core center electrode with an iridium tip, which provides a balance of excellent electrical conductivity and wear resistance. The taper cut ground electrode tip design increases spark exposure, promoting more complete combustion and improved throttle response. The spark plug’s nickel ground electrode core and standard ground configuration ensure consistent performance under various operating conditions. With a pre-gap size of 0.032 inches and a flat seat type, this spark plug is designed to fit securely and maintain optimal spark gap for efficient ignition.

The Iridium IX Spark Plug line from NGK is known for its use of iridium, a metal with a high melting point and superior durability compared to conventional spark plugs. This product line is engineered to provide longer service life and stable ignition performance, making it suitable for vehicles requiring precise ignition components.

Compatible Vehicles and Applications

This NGK Iridium IX Spark Plug 5688 is compatible with various models from Geo, Saab, and Toyota, including the Toyota 4Runner, Celica, Corolla, and Prizm, as well as the Saab 900. It is designed specifically for secondary ignition systems in these vehicles, ensuring proper fitment and reliable operation.

• Resolves misfires and rough idling issues
• Improves cold start performance
• Enhances fuel efficiency by promoting complete combustion
• Reduces engine hesitation during acceleration
• Helps maintain consistent engine power output

Installation Notes and Tips

When installing the NGK Iridium IX Spark Plug 5688, ensure the spark plug gap is set to the specified pre-gap size of 0.032 inches if adjustment is necessary. Use a torque wrench to tighten the spark plug to the manufacturer’s recommended torque specification to avoid damage to the threads or improper sealing. The 5/8 inch hex size allows for standard spark plug socket compatibility. Inspect the ignition system components for wear or damage during installation to maintain optimal performance.

Quality Assurance and Warranty

NGK spark plugs are manufactured to meet strict quality standards, ensuring consistent performance and durability. The Iridium IX Spark Plug 5688 undergoes rigorous testing for heat range, electrode wear, and electrical resistance, rated at 5000 ohms to reduce radio frequency interference. While specific warranty details may vary, NGK products typically come with a limited warranty against manufacturing defects. Refer to NGK’s official documentation for complete warranty information.