Bosch 7900 Spark Plug

Bosch Nickel Spark Plug 7900 Overview

Bosch 7900 is a conventional nickel-copper spark plug built for steady ignition performance and value. It uses a heavy-duty yttrium-enhanced nickel center electrode with a copper core to support longer service life than a basic copper-core plug, while meeting or exceeding original equipment specifications for nickel-copper applications.

Compatible With a wide range of import and domestic engines, including select Chevrolet Metro, Porsche 928, and Volvo 940 applications, Bosch 7900 is a practical OE-style replacement for secondary ignition service. The resistor design, ceramic insulator, and tapered V-profile ground electrode help maintain consistent spark delivery in everyday driving.

Key Features

• Conventional nickel-copper spark plug for 4-cycle engines
• Yttrium-enhanced nickel center electrode with copper core
• Resistor design rated at 6000 ohms
• Tapered V-profile ground electrode tip for stable spark exposure
• Flat seat, 14 mm thread diameter, 19 mm reach
• Non-projected ceramic insulator for OE-style fitment
• Manufacturer heat range 7

Detailed Description

Bosch Nickel 7900 is engineered for drivers and technicians who need a straightforward replacement spark plug that follows OE specifications for nickel-copper core designs. The nickel-ytrium center and ground electrode materials, paired with a copper core, are selected to balance durability, conductivity, and everyday ignition performance. The 20.8 mm hex size, flat seat, and 0.8 mm pre-gap support direct replacement in listed applications without unnecessary complexity.

This part number appears across many older import platforms, including 1998-2001 Chevrolet Metro, 1990-1995 Suzuki Samurai, 1991-1995 Volvo 940, and 1984-1989 Porsche 911 applications. Bosch 7900 also shows fitment for select Mitsubishi Eclipse, Land Rover Defender 90, and Mazda B2200 models, making it a useful OE-style service part for secondary ignition maintenance.

Common Problems This Plug Can Address

• Hard starting caused by worn spark plug electrodes
• Rough idle from inconsistent ignition output
• Misfire conditions related to aged secondary ignition components
• Reduced throttle response from degraded spark quality
• Maintenance replacement for high-mileage nickel-copper plug applications

Installation Notes and Tips

Verify the required gap and compare it to the vehicle specification before installation; listed applications include gaps such as 0.028 in, 0.032 in, 0.035 in, 0.040 in, 0.042 in, 0.044 in, and 0.045 in depending on the vehicle. Confirm thread diameter, reach, seat type, and hex size against the engine specification, especially on older vehicles with multiple plug options. For best results, install on a cool engine and torque to the manufacturer’s specification.

Fits 1998-2001 Chevrolet Metro, N/A; 1990-1995 Suzuki Samurai, N/A; 1991-1995 Volvo 940, N/A; 1984-1989 Porsche 911, N/A; 1990-1999 Mitsubishi Eclipse, N/A; and other listed applications in the fitment data.

Quality Assurance

Bosch manufactures this spark plug to meet or exceed original equipment specifications for nickel-copper core spark plugs. The conventional construction and OE-focused dimensions make Bosch 7900 a dependable service replacement for maintenance on compatible vehicles.