Autolite AP23 Spark Plug

Reliable Ignition Performance for Select GM and Ford Vehicles

The Autolite AP23 Platinum Spark Plug is engineered to deliver consistent ignition and improved durability for a range of Buick, Cadillac, Chevrolet, Ford, GMC, Mercury, Oldsmobile, and Pontiac models. Designed with precision materials and specifications, this spark plug supports efficient combustion and reliable engine operation.

• Platinum center electrode tip and core for enhanced wear resistance
• Tapered ground electrode tip made of nickel for stable spark delivery
• Resistor type with 5000 ohms resistance to reduce electrical noise
• Ceramic mid-projection insulator for optimal heat dissipation
• Standard center electrode design with a 0.045 inch pre-gap size
• Thread diameter of 14.0 mm and reach of 11.0 mm (0.433 inches)
• Hex size 5/8 inch (16 mm) for easy installation
• Compatible with ignition systems requiring stud-type electrical terminals

About the Autolite Platinum Spark Plug Line

The Platinum Spark Plug line from Autolite focuses on durability and consistent ignition performance by utilizing platinum materials on the center electrode tip and core. This design reduces electrode wear and maintains a stable spark over time, which is critical for maintaining engine efficiency and reducing misfires. The AP23 model benefits from these features, making it suitable for a variety of secondary ignition applications in older and classic GM and Ford vehicles.

Technical Details and Specifications

The AP23 spark plug features a tapered seat type and a single ground electrode constructed from nickel, designed to provide a reliable spark path. The resistor type spark plug includes a 5000 ohm resistance to minimize radio frequency interference, ensuring compatibility with modern vehicle electronics. The ceramic insulator with mid-projection design helps maintain proper heat range and prevents fouling. With a pre-gap size of 0.045 inches (1.10 mm), this spark plug is ready for installation in compatible engines without additional gap adjustment.

Compatible Vehicles and Applications

• Buick models including Skylark and Century
• Cadillac vehicles requiring secondary ignition spark plugs
• Chevrolet Camaro, Cavalier, and S10 series
• Ford Mustang, Cougar, and Mercury Cougar
• GMC S15 and Jimmy trucks
• Oldsmobile Cutlass Ciera and Firenza
• Pontiac Firebird, Fiero, and Sunbird

Common Issues Addressed by the AP23 Spark Plug

• Engine misfires due to worn or fouled spark plugs
• Reduced fuel efficiency from inconsistent ignition
• Difficulty starting engines in compatible Buick, Chevrolet, and Ford models
• Electrical interference affecting vehicle electronics
• Premature electrode wear in high-mileage vehicles

Installation Notes and Tips

Before installation, verify the spark plug gap is set to 0.045 inches (1.10 mm) if adjustment is necessary. Use a 5/8 inch (16 mm) socket wrench for proper torque application. Ensure the spark plug threads match the engine’s 14.0 mm diameter and 11.0 mm reach to avoid damage. The stud-type electrical terminal requires compatible ignition wires or connectors. Always follow vehicle manufacturer torque specifications to prevent over-tightening.

Quality Assurance and Warranty

Autolite spark plugs, including the AP23 Platinum Spark Plug, are manufactured to meet OEM standards for fit, form, and function. The use of platinum electrodes and ceramic insulators ensures durability and consistent performance. While specific warranty details are not provided, Autolite products typically come with quality guarantees against manufacturing defects. For best results, use the AP23 spark plug in vehicles listed under the compatible makes and models.