Bosch 9612 Spark Plug

Overview of Bosch OE Fine Wire Double Iridium Spark Plug 9612

The Bosch OE Fine Wire Double Iridium Spark Plug 9612 is engineered for reliable ignition performance in select GM vehicles. Designed with advanced materials and precise specifications, this spark plug supports efficient combustion and consistent engine operation.

• Double iridium center and ground electrode tips for durability
• Tapered ground electrode tip design with a single ground electrode
• Pre-gap size of 1.1 mm for optimal spark delivery
• Resistor type spark plug with 6000 ohms resistance
• Compatible with various Buick, Cadillac, Chevrolet, GMC, Oldsmobile, Pontiac, and Saturn models

Features of the OE Fine Wire Double Iridium Spark Plug

The OE Fine Wire Double Iridium line from Bosch focuses on enhanced ignition efficiency and longevity. This spark plug features a fine wire iridium center electrode combined with a platinum-iridium ground electrode tip, both supported by nickel-yttrium and copper core materials. The ceramic insulator is projected and designed to withstand high temperatures, while the tapered seat and ground electrode tip ensure a precise fit and spark gap. The 16 mm hex size and 17.5 mm reach make it suitable for specific GM engines requiring these dimensions.

Technical Specifications and Compatibility

Part number 9612 is a 4-cycle spark plug with a 14 mm thread diameter and a manufacturer heat range of 9. The resistor value of 6000 ohms helps reduce electrical noise interference. This spark plug is compatible with a range of GM vehicles, including Buick Century, Cadillac CTS, Chevrolet Avalanche 2500, GMC Sierra 2500 HD, Oldsmobile Cutlass Supreme, Pontiac Grand Prix, and Saturn Aura, among others. It is designed for use in gasoline engines requiring a tapered seat and standard ground configuration.

Applications and Problem Solving

• Restores proper ignition in engines experiencing misfires or rough idling
• Improves fuel efficiency by ensuring consistent spark delivery
• Reduces electrode wear and extends service intervals
• Minimizes electrical interference with onboard electronics
• Supports smooth engine start-up and acceleration performance

Installation Notes and Tips

When installing the Bosch OE Fine Wire Double Iridium Spark Plug 9612, ensure the spark plug gap is set to 1.1 mm as specified. Use a torque wrench to tighten the plug to the manufacturer’s recommended torque to avoid damage to the tapered seat. Inspect the spark plug threads and cylinder head for cleanliness before installation. This spark plug is designed for 4-cycle engines and should be replaced in sets to maintain balanced engine performance.

Quality Assurance and Warranty

Bosch OE Fine Wire Double Iridium spark plugs are manufactured to meet OEM standards for fit, form, and function. The use of premium materials such as iridium and platinum ensures durability and consistent performance. While specific warranty details are not provided here, Bosch products typically come with a limited warranty covering defects in materials and workmanship.