Autolite APP3923 Spark Plug

Reliable Ignition with Autolite Double Platinum Spark Plug APP3923

The Autolite Double Platinum Spark Plug APP3923 delivers consistent ignition performance for a wide range of vehicles including Acura, BMW, Toyota, and Volkswagen models. Designed with durable platinum electrodes and a tapered ground electrode tip, this spark plug supports efficient combustion and long service life.

• Double platinum center and ground electrode tips for enhanced durability
• Nickel ground electrode core material with tapered tip design
• Standard electrical stud terminal type for secure connection
• Flat seat type with 0.750 inch (19.5 mm) reach and 14.0 mm thread diameter
• Resistor type spark plug with 4000 ohm resistance to reduce electrical noise
• Ceramic insulator with mid projection design for reliable insulation
• Pre-gap size of 0.044 inches (1.10 mm) for optimal spark gap
• Hex size 5/8 inch (16 mm) for easy installation

About the Double Platinum Spark Plug Line

The Autolite Double Platinum Spark Plug line features platinum on both the center and ground electrode tips, providing improved wear resistance and longer service intervals compared to conventional spark plugs. This design helps maintain a stable spark over time, which is critical for vehicles such as the Audi A4, Honda Civic, and Mercedes-Benz C230 that require consistent ignition performance under varied driving conditions.

Technical Details and Compatibility

The APP3923 spark plug is engineered with a nickel core ground electrode and a platinum-tipped tapered ground electrode tip, enhancing durability and combustion efficiency. The ceramic insulator with mid projection ensures excellent electrical insulation and heat dissipation. Its flat seat design and 0.750 inch reach make it compatible with many secondary ignition systems across multiple makes and models, including Toyota 4Runner, BMW 525i, and Volkswagen Golf.

Common Applications and Problem Solving

• Restores engine misfire issues caused by worn or fouled spark plugs
• Improves fuel efficiency by ensuring consistent spark delivery
• Reduces ignition system electrical interference with built-in resistor
• Extends spark plug service life in high-performance and daily driver vehicles
• Supports smooth engine start and stable idle in Acura and Lexus models

Installation Notes and Tips

• Verify correct spark plug gap of 0.044 inches (1.10 mm) before installation
• Use a 5/8 inch (16 mm) spark plug socket for proper torque application
• Ensure threads are clean and apply anti-seize compound if recommended by vehicle manufacturer
• Torque spark plug to vehicle-specific specifications to avoid damage
• Check compatibility with your vehicle’s ignition system, especially for models like the Dodge Ram 1500 and Subaru Outback

Quality Assurance and Warranty

Autolite spark plugs, including the APP3923, are manufactured to meet or exceed OEM specifications for fit, form, and function. The Double Platinum Spark Plug line is designed for durability and consistent performance. While specific warranty details may vary, Autolite products typically come with a limited warranty against manufacturing defects to ensure customer confidence in product reliability.