Autolite 4173 Spark Plug

Autolite 4173 Copper Spark Plug Overview

Autolite 4173 is a copper non-resistor spark plug built for quick starts, steady idle quality, and smooth throttle response. It follows OE-style form, fit, and function for a wide range of foreign and domestic applications, making it a practical replacement for drivers looking for dependable ignition performance.

The Autolite Copper Non-Resistor Spark Plug line focuses on straightforward ignition service with a copper core, nickel electrode materials, and a ceramic insulator. For vehicles that call for a flat-seat plug with a 0.500-inch reach and 0.028-inch pre-gap, part number 4173 offers a direct-fit service option.

Key Features

• Copper center electrode core for consistent ignition transfer
• Nickel center and ground electrode tip materials
• Non-resistor design for applications that specify no resistor type
• Flat seat construction with 0.500-inch reach
• 0.028-inch pre-gap for specified applications
• 13/16-inch hex size and removable nut terminal
• Ceramic insulator with short insulator design

Detailed Product Description

Autolite 4173 is engineered as an OE-style spark plug replacement for engines that require a copper, non-resistor configuration. The standard center electrode design, tapered ground electrode tip, and nickel electrode materials support stable spark delivery in everyday driving conditions. This spark plug is a practical choice for maintenance on vehicles that need a flat-seat plug with a 12 mm thread diameter and 0.500-inch reach.

As part of the Autolite Copper Non-Resistor Spark Plug family, 4173 is positioned for drivers and technicians who want a straightforward ignition service part that matches original equipment dimensions and electrical requirements. It is a relevant search match for spark plug replacement needs on Ford Mustang, Chevrolet Camaro, and Dodge Dart applications where this specification is called for. Part number 4173 also appears in cross-reference listings with Champion 845.

Common Issues This Spark Plug Can Address

• Hard starting caused by worn or fouled spark plugs
• Rough idle from inconsistent spark delivery
• Reduced throttle response from aged ignition components
• Misfire symptoms related to plug wear or incorrect gap
• Fuel economy loss tied to inefficient combustion

Installation Notes and Tips

Verify the required thread diameter, reach, seat type, and resistor specification before installation. Check the plug gap against the engine’s service specification before use, since the pre-gap listed here is application-specific. Use the correct socket size for the 13/16-inch hex and confirm the removable nut terminal matches the ignition wire or coil connection style on the vehicle.

For fitment-based searches, this part is commonly referenced for Ford Mustang, Chevrolet Camaro, and Dodge Dart spark plug replacement applications where the OE specification matches Autolite 4173. Always compare the engine’s original plug specification to the plug dimensions and electrical design before service.

Quality Assurance

Autolite supplies ignition products to the automotive aftermarket and original equipment manufacturers, and this spark plug is built to OE form, fit, and function standards for specified applications. The copper-core, nickel-electrode construction is intended to support consistent ignition performance in routine maintenance service.