Autolite AP23 Spark Plug

Autolite Platinum Spark Plug AP23 Overview

The Autolite Platinum Spark Plug AP23 is built for drivers who want OE-style ignition performance with platinum durability. It is a direct-fit spark plug option for a wide range of classic Chevrolet, GMC, Pontiac, Buick, Cadillac, Oldsmobile, Ford, and Mercury applications, including Camaro, S10, Firebird, and Mustang models.

Autolite Platinum spark plugs are part of the Platinum Spark Plug line, which focuses on durable electrode materials, easier starting, quicker throttle response, and improved fuel economy compared with standard copper plugs. The AP23 uses a platinum center electrode and a nickel ground electrode for consistent ignition performance in everyday driving.

• Part number: AP23
• Platinum center electrode tip material for extended service life
• Nickel ground electrode with tapered tip design
• Resistor spark plug with 5000 ohm resistance
• Pre-gapped at 0.045 in. / 1.10 mm
• 14 mm thread diameter, 5/8 in. hex, tapered seat
• Ceramic insulator with mid-projection design
• OE-style form, fit, and function for many domestic applications

Detailed Product Description

The Autolite AP23 is a platinum spark plug engineered for stable ignition performance and long-term durability. Its platinum center electrode and platinum tip material help maintain consistent firing characteristics, while the nickel ground electrode and tapered ground tip support reliable spark delivery. The resistor design helps reduce electrical noise in the ignition system, and the 0.045 in. pre-gap supports straightforward installation on listed applications.

This part cross-references Champion Spark Plug 400 for the same application. The AP23 is a practical OE-style replacement for vehicles such as Chevrolet Camaro, Chevrolet S10, Pontiac Firebird, and Ford Mustang where the listed gap and thread specifications match the engine requirements.

What This Spark Plug Helps Address

• Hard starting caused by worn or inconsistent spark plugs
• Rough idle from weak or unstable ignition output
• Slower throttle response from degraded plug performance
• Fuel economy loss related to inefficient combustion
• Misfire concerns tied to worn electrode materials

Installation Notes and Fitment Tips

Compatible With 1985-1988 Chevrolet Camaro, N/A; 1985-1988 Chevrolet S10, N/A; 1985-1988 Chevrolet S10 Blazer, N/A; 1985-1988 GMC S15, N/A; 1985-1988 GMC S15 Jimmy, N/A; 1985-1988 Pontiac Fiero, N/A; 1983-1988 Pontiac Firebird, N/A; 1980-1987 Chevrolet Chevette, N/A; 1981-1987 Pontiac Acadian, N/A; 1981-1987 Pontiac T1000, N/A; 1983-1986 Buick Skyhawk, N/A; 1982-1986 Cadillac Cimarron, N/A; 1985-1986 Cadillac Cimarron, N/A; 1982-1986 Chevrolet Cavalier, N/A; 1985-1986 Chevrolet Cavalier, N/A; 1984-1986 Chevrolet Celebrity, N/A; 1986 Oldsmobile Cutlass Ciera, N/A; 1983-1986 Oldsmobile Firenza, N/A; 1985-1986 Oldsmobile Firenza, N/A; 1985-1986 Pontiac 6000, N/A; 1983 Pontiac 6000, N/A; 1986 Pontiac Sunbird, N/A; 1982-1985 Buick Skylark, N/A; 1984-1985 Chevrolet Citation II, N/A; 1984-1985 Pontiac J2000 Sunbird, N/A; 1983-1984 Chevrolet S10, N/A; 1983-1984 Chevrolet S10 Blazer, N/A; 1983-1984 GMC S15, N/A; 1983-1984 GMC S15 Jimmy, N/A; 1982-1984 Oldsmobile Omega, N/A; 1984 Pontiac 6000, N/A; 1982-1984 Pontiac Phoenix, N/A; 1982-1983 Chevrolet Citation, N/A; 1983 Pontiac J2000, N/A; 1979 Chevrolet Chevette, N/A; 1970 Ford Mustang, N/A; 1970 Mercury Cougar, N/A; 1969 Ford Mustang, N/A.

Verify the engine’s specified spark plug gap before installation. Listed applications call for either 0.045 in. (1.1 mm) or 0.035 in. (0.9 mm), depending on the vehicle and engine calibration. Use the correct torque procedure for the cylinder head material and confirm the 14 mm thread, 5/8 in. hex, and tapered seat match the original specification.

Quality Assurance

Autolite supplies ignition products to the automotive aftermarket and original equipment manufacturers, and the Platinum Spark Plug line is built to OE form, fit, and function standards for a broad range of domestic and foreign vehicles. The AP23 is manufactured to support durable, consistent ignition performance in the applications listed above.