Autolite APP3924 Spark Plug

Overview of Autolite Double Platinum Spark Plug APP3924

The Autolite Double Platinum Spark Plug APP3924 is engineered for reliable ignition performance across a wide range of vehicles including Acura, BMW, Ford, Honda, Toyota, and Volkswagen models. Designed with durable platinum electrodes and a tapered ground electrode tip, this spark plug supports consistent engine operation and efficient combustion.

• Double platinum center and ground electrode tips for extended durability
• Nickel ground electrode core with tapered tip design
• Standard electrical terminal type: stud
• Pre-gapped to 0.044 inches (1.10 mm) for optimal spark
• Flat seat type with 14.0 mm thread diameter and 0.750 inch (19.5 mm) reach
• Resistor type spark plug with 4000 ohm resistance to reduce electrical noise
• Ceramic mid-projection insulator for improved heat dissipation
• Hex size 5/8 inch (16 mm) for installation with standard tools

Detailed Product Description

The Autolite Double Platinum Spark Plug APP3924 features a platinum center electrode core and tip, paired with a platinum ground electrode tip mounted on a nickel core. This combination enhances electrode longevity and maintains stable spark performance over time. The tapered ground electrode tip design improves ignition efficiency by providing a precise spark gap. The spark plug includes a ceramic mid-projection insulator that helps manage heat and electrical insulation, contributing to consistent engine starts and smooth operation.

With a flat seat and a thread diameter of 14.0 mm, this spark plug is designed for compatibility with a broad range of vehicles such as the Toyota 4Runner, BMW 328i, Ford Taurus, Honda Civic, and Volkswagen Jetta. The resistor type with 4000 ohm resistance helps suppress radio frequency interference, ensuring proper operation of onboard electronics.

Applications and Common Issues Addressed

• Improves ignition reliability in Acura, Audi, and Lexus vehicles
• Reduces misfires and rough idling in Chrysler and Dodge models
• Enhances fuel efficiency and throttle response in Hyundai and Nissan cars
• Helps maintain smooth engine performance in Subaru and Mazda vehicles
• Supports consistent spark delivery in Mercedes-Benz and Land Rover engines

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 the flat seat matches the engine’s cylinder head design
• Apply anti-seize compound sparingly on threads if recommended by vehicle manufacturer
• Torque to manufacturer specifications to avoid damage or improper sealing

Quality Assurance and Warranty

Autolite’s Double Platinum Spark Plug line is manufactured to meet OEM standards for fit, form, and function. The APP3924 spark plug undergoes rigorous quality control to ensure consistent performance and durability. This spark plug includes a built-in resistor to minimize electrical interference, supporting reliable vehicle electronics operation. Warranty coverage details should be confirmed with the product supplier or vehicle manufacturer.

About the Autolite Double Platinum Spark Plug Line

The Double Platinum Spark Plug line from Autolite is designed to provide enhanced durability and stable ignition performance through the use of platinum on both the center and ground electrode tips. This design reduces electrode wear and maintains a consistent spark gap over time, making it suitable for vehicles requiring long-lasting spark plugs. The APP3924 is part of this line, offering a balance of performance and longevity for a wide range of automotive applications.