Bosch 79100 Spark Plug

Bosch Nickel Spark Plug for OE-Style Ignition

The Bosch 79100 is a conventional nickel-copper spark plug built for steady ignition performance and value. It uses a copper-core center electrode with a nickel tip, plus a yttrium-enhanced nickel design for longer service life in secondary ignition applications.

Compatible With 2003-2004 Cadillac CTS and 2002-2003 Saturn Vue, this Bosch Nickel spark plug is engineered to meet or exceed original equipment specifications for nickel-copper core spark plugs. The 79100 also features a resistor design, flat seat, 14 mm thread diameter, 19 mm reach, and a 1.35 mm pre-gap for OE-style replacement service.

Key Features

• Bosch Nickel line conventional spark plug for secondary ignition service
• Part number 79100 for OE-style replacement identification
• Copper core center electrode with nickel center electrode tip
• Nickel ground electrode material with multiple ground electrode design
• Resistor type spark plug with 6000 resistance
• Flat seat, 14 mm thread diameter, 19 mm reach
• Ceramic insulator and non-removable nut terminal
• Manufacturer heat range 8 and non-projected insulator type

Product Details

The Bosch Nickel product line focuses on conventional nickel-copper spark plugs that balance durability and ignition consistency. On the 79100, the copper core helps manage heat transfer while the nickel electrode materials support stable spark delivery in everyday driving conditions. The multiple ground electrode configuration and standard center electrode design follow an OE-style layout for vehicles that call for this plug specification.

This part cross-references Bosch 79100 for the same application. It is a direct-fit style spark plug for 2003-2004 Cadillac CTS and 2002-2003 Saturn Vue applications listed in the fitment data.

Common Issues This Part Addresses

• Engine misfire caused by worn spark plug electrodes
• Hard starting from weak or inconsistent spark output
• Rough idle related to aged ignition components
• Reduced throttle response from degraded plug performance
• Maintenance replacement for OE-spec nickel-copper spark plug service

Installation Notes and Tips

Verify the vehicle application before installation and confirm the plug gap matches the engine specification if adjustment is required. Use the correct spark plug socket for the 16 mm hex and inspect ignition coils, wires, and boots during service to avoid repeat misfire concerns. Thread the plug by hand first to prevent cross-threading in the cylinder head.

Quality Assurance

Bosch designs this spark plug to meet or exceed original equipment specifications for nickel-copper core applications. The 79100 is built with a ceramic insulator, resistor design, and OE-style dimensions to support consistent ignition service in the listed Cadillac CTS and Saturn Vue applications.