Bosch 9687 Spark Plug

Reliable Ignition Performance for Mitsubishi and Toyota Vehicles

The Bosch OE Fine Wire Double Iridium Spark Plug 9687 is engineered to deliver consistent ignition and efficient combustion for select Mitsubishi and Toyota models. Designed with advanced materials and precise specifications, this spark plug supports optimal engine performance and durability.

• Double iridium-platinum ground electrode tip for enhanced wear resistance
• Fine wire iridium center electrode for improved ignition and fuel efficiency
• 6000 ohm resistor to reduce electrical noise and protect ignition components
• Standard ground electrode with J-gap configuration for reliable spark delivery
• Copper core center electrode for superior thermal conductivity
• Ceramic insulator with projected design for better heat dissipation
• Flat seat type with 14 mm thread diameter and 19 mm reach
• Manufacturer heat range rating of 7 suitable for specific engine requirements
• Hex size 16 mm for standard installation tools

About the OE Fine Wire Double Iridium Product Line

The Bosch OE Fine Wire Double Iridium line focuses on combining fine wire center electrodes with double iridium-platinum ground electrodes to enhance spark efficiency and longevity. This design reduces electrode wear and maintains stable ignition over extended service intervals, making it suitable for modern 4-cycle engines requiring precise ignition components.

Detailed Product Description

The Bosch 9687 spark plug features a fine wire iridium center electrode supported by a copper core, which improves heat transfer and ignition reliability. The ground electrode uses a durable iridium-platinum tip with a standard design and J-gap configuration, ensuring consistent spark generation. The ceramic insulator is projected and designed to withstand high temperatures while maintaining electrical insulation. With a pre-gap size of 0.8 mm and a flat seat, this spark plug fits securely in the combustion chamber. The integrated 6000 ohm resistor helps suppress electromagnetic interference, protecting sensitive vehicle electronics.

Compatible Vehicles and Common Applications

• Replacement spark plug for Mitsubishi Eclipse, Endeavor, and Galant models
• Suitable for Toyota Prius C ignition systems
• Addresses issues such as misfires, rough idling, and poor fuel economy
• Helps reduce engine hesitation and improves cold start performance
• Supports stable combustion in 4-cycle engines requiring iridium spark plugs

Installation Notes and Tips

Ensure the spark plug gap is set to the manufacturer’s recommended specification before installation, although the Bosch 9687 comes pre-gapped at 0.8 mm. Use a 16 mm socket wrench for proper tightening torque to avoid damage to the spark plug or cylinder head. Inspect the spark plug threads and seat type compatibility with your vehicle’s engine to confirm fitment. Avoid over-tightening to maintain the integrity of the flat seat design.

Quality Assurance and Warranty

Bosch OE Fine Wire Double Iridium spark plugs are manufactured to meet strict quality standards for durability and performance. The use of premium materials such as iridium and platinum ensures extended service life. While specific warranty details are not provided, Bosch products typically adhere to industry standards for automotive ignition components.