Autolite AP3924 Spark Plug

Overview of Autolite AP3924 Platinum Spark Plug

The Autolite AP3924 Platinum Spark Plug is engineered for reliable ignition performance across a wide range of vehicles including Acura, BMW, Ford, Honda, Toyota, and Volkswagen models. Designed with durable materials and precise specifications, this spark plug supports efficient combustion and consistent engine operation.

• Platinum center electrode tip and core for enhanced durability
• Tapered ground electrode tip made of nickel for stable spark delivery
• Resistor type with 4000 ohms resistance to reduce electrical noise
• Flat seat type with 14.0 mm thread diameter and 0.750 inch reach
• Ceramic insulator with mid projection for optimal insulation
• Pre-gap size of 0.044 inches (1.10 mm) for precise spark gap
• Hex size 5/8 inch (16 mm) for standard installation tools
• Stud type electrical terminal for secure connection

Detailed Product Features and Specifications

The AP3924 spark plug features a platinum center electrode tip and core, which provides improved wear resistance and longevity compared to conventional spark plugs. The nickel ground electrode with a tapered tip design ensures consistent spark formation and efficient ignition. This spark plug includes a resistor with 4000 ohms resistance to minimize radio frequency interference, protecting sensitive electronic components in modern vehicles.

The ceramic insulator with mid projection enhances insulation properties and heat dissipation, contributing to stable engine performance. The flat seat design and 14.0 mm thread diameter ensure compatibility with a variety of engines, while the 0.750 inch reach fits specific combustion chamber designs. The pre-gap size of 0.044 inches (1.10 mm) is factory set for optimal spark gap, reducing the need for adjustment during installation.

About the Autolite Platinum Spark Plug Line

The Platinum Spark Plug line by Autolite is designed to offer a balance of durability and performance for secondary ignition systems. Utilizing platinum materials on the center electrode tip and core, these spark plugs provide extended service life and consistent ignition quality. The AP3924 is part of this line, delivering reliable spark delivery for a broad range of vehicle makes and models.

Compatible Vehicles and Applications

• Compatible with Acura, BMW, Ford, Honda, Toyota, Volkswagen, and many other makes
• Suitable for models such as 4Runner, 323i, Camry, Civic, Jetta, and more
• Designed for use in secondary ignition systems requiring a 14.0 mm thread diameter and 0.750 inch reach
• Ideal for vehicles needing a resistor spark plug to reduce electrical interference

Common Issues Addressed by Autolite AP3924

• Misfiring or inconsistent engine ignition
• Reduced fuel efficiency due to poor spark quality
• Engine hesitation or rough idling
• Electrical interference affecting onboard electronics
• Premature spark plug wear in high-mileage vehicles

Installation Notes and Tips

Ensure the spark plug gap is checked before installation, although the AP3924 comes pre-gapped at 0.044 inches (1.10 mm). Use a 5/8 inch (16 mm) socket wrench for proper tightening to the manufacturer’s torque specifications. The stud type electrical terminal requires secure connection to the ignition wire. Avoid over-tightening to prevent damage to the flat seat or threads. This spark plug is designed for mid-projection insulator applications, so verify compatibility with your engine’s cylinder head design.

Quality Assurance and Warranty

Autolite manufactures the AP3924 Platinum Spark Plug to meet OEM standards for ignition components. The use of platinum and nickel materials ensures durability and consistent performance. While specific warranty details are not provided here, Autolite products typically come with manufacturer-backed quality assurance to support reliable operation in compatible vehicles.