Bosch 79091 Spark Plug

Bosch 79091 Nickel Spark Plug Overview

Bosch 79091 is a conventional nickel-copper spark plug built for steady ignition performance and OE-style service life. It is a direct secondary ignition service part for select Chevrolet Aveo, Chevrolet Aveo5, Pontiac G3, Pontiac G3 Wave, and Saturn Astra applications from 2008 through 2011.

The Bosch Nickel line focuses on practical replacement value, using a yttrium-enhanced nickel center electrode with a copper core to support longer wear than a basic copper-core design. Bosch 79091 also uses a resistor design, a projected ceramic insulator, and a flat seat for the specified 14 mm thread applications.

Key Features

• Bosch 79091 conventional nickel-copper spark plug
• Fits 2009-2011 Chevrolet Aveo, N/A
• Fits 2009-2011 Chevrolet Aveo5, N/A
• Fits 2009-2010 Pontiac G3, N/A
• Fits 2009 Pontiac G3 Wave, N/A
• Fits 2008-2009 Saturn Astra, N/A
• 14 mm thread diameter with flat seat
• 0.9 pre-gap size and 6000 ohm resistance
• Nickel center and ground electrode tip materials with copper cores
• Projected ceramic insulator and single ground electrode design

Detailed Description

Bosch 79091 is engineered as a standard 4-cycle spark plug for secondary ignition service where a nickel-copper construction is specified. The center electrode uses a copper core with a nickel tip, while the ground electrode also uses a copper core with a nickel tip and tapered J-gap configuration. This layout supports consistent spark delivery in the listed OE-style applications and follows Bosch’s conventional Nickel product line approach for value-focused replacement service.

For fitment-based searches, this spark plug is a direct match for 2009-2011 Chevrolet Aveo and Chevrolet Aveo5, 2009-2010 Pontiac G3, 2009 Pontiac G3 Wave, and 2008-2009 Saturn Astra. The Bosch 79091 part number is useful when cross-checking ignition service parts for these vehicles, especially when matching the specified 14 mm thread, 19 mm reach, flat seat, and resistor configuration.

Common Issues This Part May Address

• Hard starting caused by worn spark plug electrodes
• Rough idle from inconsistent ignition firing
• Misfire conditions related to aged secondary ignition components
• Reduced throttle response from degraded spark delivery
• Service intervals reached on OE-style nickel spark plugs

Installation Notes and Tips

Verify the engine’s required thread diameter, reach, seat type, and heat range before installation. Bosch 79091 is a 14 mm, 19 mm reach, flat-seat spark plug with a 0.9 pre-gap size, so confirm the engine specification matches these values before service. Use proper spark plug removal and installation procedures to avoid thread damage in the cylinder head, and inspect the ignition system for wear if misfire symptoms are present.

Quality Assurance

Bosch designs this Nickel spark plug to meet or exceed original equipment specifications for nickel-copper core applications. The Bosch 79091 part number identifies the exact service part for the listed Chevrolet, Pontiac, and Saturn applications.