Bosch 7579 Spark Plug

Bosch Nickel Spark Plug 7579 Overview

Bosch 7579 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 design, while meeting or exceeding original equipment specifications for nickel-copper spark plugs.

Compatible With 1982-1988 Ford Ranger, 1984-1987 Ford Tempo, and 1983 Ford Mustang applications, Bosch 7579 is also listed for Buick, Oldsmobile, Pontiac, Mercury, and additional Ford models across the same era. The Bosch Nickel line focuses on dependable secondary ignition service with OE-style construction.

• Conventional nickel-copper spark plug design
• Yttrium-enhanced nickel center electrode with copper core
• Resistor type with 6000 resistance
• Standard ground electrode tip and standard ground configuration
• Tapered seat with 17.5 reach
• Ceramic insulator and non-projected insulator type
• Removable nut terminal for common ignition wire setups
• Manufacturer heat range 9
• Pre-gapped at 1
• Bosch part number 7579

Detailed Product Description

Bosch 7579 is designed for drivers and technicians who need a direct-style spark plug for older gasoline engines that call for a nickel-copper core plug. The tapered seat, standard electrode layout, and resistor construction support consistent spark delivery and stable ignition performance in the listed Ford Ranger, Ford Tempo, Ford Mustang, Buick Century, Oldsmobile Cutlass Ciera, and Pontiac Grand Am fitments. Bosch 7579 also appears in applications for Buick LeSabre, Skylark, Riviera, Oldsmobile Delta 88, 98, Toronado, and Mercury Topaz, among others in the fitment list.

This Bosch Nickel spark plug is built around OE-spec expectations for secondary ignition service, making it a practical choice when replacing worn plugs on 1982-1988 Ford Ranger, 1984-1987 Ford Tempo, or 1983 Ford Thunderbird engines. Part number 7579 is a straightforward replacement option for maintenance on vehicles that require a 4-cycle spark plug with a removable nut terminal.

Common Issues This Spark Plug Can Address

• Hard starting caused by worn or fouled spark plugs
• Rough idle from inconsistent ignition firing
• Misfire symptoms related to aged secondary ignition components
• Reduced throttle response from weak spark delivery
• Maintenance replacement for high-mileage original plugs

Installation Notes and Tips

Verify the vehicle’s required seat type, reach, heat range, and terminal style before installation. Bosch 7579 uses a tapered seat, 17.5 reach, and removable nut terminal, so it should be matched to the engine specification listed by the vehicle manufacturer. Check plug gap against the engine’s service specification before installation, even though the plug is pre-gapped at 1.

For best results, inspect ignition wires, distributor components, and coil condition during service. On fitments such as Ford Ranger, Ford Tempo, and Mercury Topaz, replacing worn secondary ignition parts at the same time can help restore consistent spark delivery.

Quality Assurance

Bosch designs the Nickel line to meet or exceed OE specifications for nickel-copper core spark plugs. Bosch 7579 follows that OE-style approach with a conventional construction intended for dependable service in the listed applications.