NGK 3964 Spark Plug

Reliable Ignition Performance for Volkswagen Vehicles

The NGK Standard Spark Plug 3964 is engineered to deliver consistent ignition performance for select Volkswagen models including the Corrado, EuroVan, Golf, Jetta, and Passat. Designed with durable materials and precise specifications, this spark plug supports efficient combustion and engine reliability.

• Resistance: 5000 ohms for optimal electrical performance
• Ground Electrode Tip Design: Semi-surface discharge for improved spark efficiency
• Center Electrode Core Material: Copper for enhanced conductivity
• Ground Electrode Core Material: Nickel for durability
• Pre-Gap Size: 0.028 inches for precise ignition timing
• Ground Electrode Quantity: Dual electrodes for stable spark generation
• Hex Size: 5/8 inch for standard installation tools
• Thread Diameter: 14.00 mm with 0.75 inch reach for proper fitment
• Electrical Terminal Type: Non-removable nut for secure connection
• Seat Type: Flat for consistent sealing
• Manufacturer Heat Range: 5 suitable for moderate engine temperatures

About the NGK Standard Spark Plug Line

The Standard Spark Plug line by NGK is designed to meet OEM specifications for a wide range of vehicles, providing reliable ignition components that maintain engine performance and efficiency. The 3964 part number is part of this line, offering a balance of durability and electrical characteristics suitable for Volkswagen engines requiring a heat range 5 spark plug with nickel and copper electrode materials.

Technical Details and Application

This spark plug features a semi-surface discharge ground electrode design with two nickel ground electrodes, enhancing spark stability and combustion efficiency. The copper core center electrode improves electrical conductivity, supporting consistent ignition. The 0.028 inch pre-gap size is factory set to optimize spark timing and engine responsiveness. With a 14 mm thread diameter and 0.75 inch reach, the NGK 3964 fits Volkswagen Corrado, EuroVan, Golf, Jetta, and Passat models requiring this specification.

Common Issues Addressed by NGK 3964 Spark Plug

• Engine misfires due to worn or faulty spark plugs
• Reduced fuel efficiency from inconsistent ignition
• Hard starting or rough idling in Volkswagen vehicles
• Loss of engine power or hesitation during acceleration
• Increased emissions caused by incomplete combustion

Installation Notes and Tips

Ensure the engine is cool before removing old spark plugs. Use a torque wrench to tighten the NGK 3964 spark plug to manufacturer specifications to avoid damage. Verify the pre-gap size of 0.028 inches before installation, adjusting if necessary. The 5/8 inch hex size allows for standard spark plug sockets. Confirm compatibility with your Volkswagen model and engine type prior to installation.

Quality Assurance and Warranty

NGK spark plugs are manufactured to meet strict quality standards, ensuring reliable performance and durability. The Standard Spark Plug line undergoes rigorous testing for heat range, electrode wear, and electrical resistance. While specific warranty details may vary, NGK products typically come with manufacturer-backed quality assurance to support long-term use in Volkswagen vehicles.