Bosch 9664 Spark Plug

Reliable Ignition Performance for Chrysler, Dodge, Jeep, and Mitsubishi

The Bosch OE Fine Wire Double Iridium spark plug 9664 is engineered to deliver consistent ignition and efficient combustion for select Chrysler, Dodge, Jeep, and Mitsubishi vehicles. Designed with advanced materials and precise specifications, this spark plug supports optimal engine performance and durability.

• Iridium center electrode tip for enhanced durability and ignition
• Tapered ground electrode tip with platinum-iridium and nickel-yttrium core
• Copper ground electrode core for improved conductivity
• Resistor type spark plug with 6000 ohm resistance to reduce electrical noise
• Flat seat type with 14mm thread diameter and 19mm reach
• Pre-gap size of 1.1 mm for precise spark gap
• Hex size 16 mm for standard installation tools
• Manufacturer heat range 8 suitable for specific engine requirements
• Non-projected ceramic insulator for reliable insulation and heat dissipation

About the Bosch OE Fine Wire Double Iridium Product Line

The OE Fine Wire Double Iridium line from Bosch features spark plugs designed with fine wire iridium center electrodes and durable ground electrodes combining platinum-iridium and nickel-yttrium materials. This combination enhances ignition reliability and electrode longevity, making it suitable for modern 4-cycle engines requiring precise spark delivery and resistance to electrode wear. The 9664 spark plug exemplifies this technology, providing consistent performance for compatible vehicles.

Technical Details and Specifications

The Bosch 9664 spark plug incorporates a copper core ground electrode and a nickel-yttrium and copper center electrode core, ensuring efficient electrical conductivity and heat transfer. The tapered ground electrode tip design improves spark exposure and combustion efficiency. With a 1.1 mm pre-gap and a flat seat, this spark plug fits securely and maintains optimal spark gap for reliable ignition. The resistor feature with 6000 ohms resistance helps minimize radio frequency interference, supporting vehicle electronics.

Compatible Vehicles and Applications

• Chrysler Aspen
• Dodge Commander, Dakota, Durango, Ram 1500
• Jeep Grand Cherokee
• Mitsubishi Raider

This spark plug is designed specifically for 4-cycle engines in these models, ensuring proper fitment and performance.

Common Issues Addressed by Bosch 9664 Spark Plug

• Engine misfires due to worn or inefficient spark plugs
• Reduced fuel efficiency from incomplete combustion
• Difficulty starting the engine in cold or damp conditions
• Increased emissions caused by poor ignition
• Rough idling or hesitation during acceleration

Installation Notes and Tips

When installing the Bosch OE Fine Wire Double Iridium 9664 spark plug, ensure the spark plug gap is set to the manufacturer’s recommended 1.1 mm pre-gap if adjustment is necessary. Use a 16 mm socket wrench for proper torque application. Avoid over-tightening to prevent damage to the flat seat and threads. It is recommended to replace all spark plugs simultaneously to maintain balanced engine performance.

Quality Assurance and Warranty

Bosch spark plugs are manufactured to meet strict OEM standards, ensuring consistent quality and reliability. The OE Fine Wire Double Iridium 9664 spark plug is built with high-grade materials including iridium and platinum alloys for extended service life. While specific warranty details may vary, Bosch products typically come with a limited warranty covering defects in materials and workmanship.