Autolite 23 Spark Plug

Autolite 23 Copper Resistor Spark Plug

Autolite 23 is an OE-style copper resistor spark plug built for quick starts, smooth acceleration, and consistent ignition performance. It uses a 14 mm thread, 5/8 in. hex, tapered seat, and a pre-gap of 0.045 in. (1.10 mm) for applications that call for this specification.

The Copper Resistor Spark Plug line is positioned as a direct-fit replacement option for a wide range of foreign and domestic vehicles, including classic and compact GM applications and select Ford models. If you are servicing a Chevrolet Camaro, Chevrolet S10, Pontiac Firebird, or Ford Mustang, Autolite 23 provides the OE form, fit, and function expected in a standard replacement plug.

• Center electrode core material: copper for stable ignition transfer
• Resistor type: yes, with 5000 ohm resistance
• Ground electrode tip design: tapered
• Insulator material: ceramic with mid-projection design
• Thread diameter: 14.0 mm with tapered seat
• Pre-gapped to 0.045 in. / 1.10 mm
• Electrical terminal type: stud

Detailed Product Overview

Autolite 23 is a copper resistor spark plug designed around OE-style dimensions and ignition requirements. The nickel center and ground electrode tip materials, copper core, and ceramic insulator support reliable spark delivery in everyday driving conditions. This part number is commonly selected for older GM compact and performance platforms, along with select Ford and Mercury applications, where the specified gap and tapered-seat design are required. This part cross-references Champion Spark Plug 400 for the same application.

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 during acceleration
• Misfire symptoms related to incorrect plug wear or gap condition
• Service replacement needs on OE-style ignition systems

Installation Notes and Tips

• Verify the required seat type, thread diameter, reach, and gap before installation.
• Confirm the vehicle calls for a 0.045 in. / 1.10 mm pre-gap specification.
• Use the correct torque procedure for tapered-seat spark plugs.
• Inspect ignition wires, coil condition, and plug wells during service to avoid repeat misfire concerns.
• Check vehicle-specific service data for final application confirmation on Chevrolet, Pontiac, Buick, Cadillac, GMC, Ford, and Mercury models.

Quality Assurance

Autolite supplies ignition products to the automotive aftermarket and OE channels, with spark plugs engineered to meet OE-style form, fit, and function requirements. Autolite 23 is built as a practical replacement for service work on vehicles such as the Chevrolet Camaro, Chevrolet S10, Pontiac Firebird, and Ford Mustang.