NGK 3961 Spark Plug

Reliable Ignition with NGK Standard Spark Plug 3961

The NGK Standard Spark Plug 3961 delivers consistent ignition performance for a variety of vehicles. Designed with durable materials and precise specifications, this spark plug supports efficient engine operation and reliable starts.

• Resistance: 5000 ohms for optimal electrical performance
• Ground Electrode Tip and Configuration: Standard design with nickel core
• Center Electrode: Copper core with nickel tip for durability
• Pre-Gap Size: Factory set at 0.032 inches for precise spark delivery
• Thread Diameter: 14.00 mm with 0.75 inch reach and flat seat type
• Hex Size: 13/16 inch for easy installation
• Electrical Terminal: Non-removable nut for secure connection
• Manufacturer Heat Range: 8, suitable for moderate engine temperatures

About the NGK Standard Spark Plug Line

The NGK Standard Spark Plug line is engineered to meet OEM specifications, providing dependable ignition components for everyday driving conditions. The Standard Spark Plug 3961 is part of this line, offering a balance of performance and durability with nickel and copper electrode materials designed to maintain stable combustion and reduce misfires.

Technical Details and Performance

The NGK 3961 spark plug features a single ground electrode with a nickel core and tip, paired with a copper core center electrode also tipped with nickel. This combination supports efficient heat dissipation and consistent spark generation. The 5000 ohm resistance helps suppress electrical noise, protecting sensitive vehicle electronics. With a pre-gap of 0.032 inches and a flat seat design, this spark plug ensures proper sealing and spark gap consistency, critical for smooth engine operation.

Applications and Problem Solving

• Restores engine misfire issues caused by worn or fouled spark plugs
• Improves cold start reliability in compatible vehicles
• Maintains stable combustion to reduce rough idling
• Helps prevent ignition system interference with onboard electronics
• Supports consistent fuel efficiency by ensuring proper spark timing

Installation Notes and Tips

When installing the NGK Standard Spark Plug 3961, verify the correct thread diameter (14.00 mm) and reach (0.75 inch) for your vehicle. Use a 13/16 inch socket for proper torque application. The pre-set gap of 0.032 inches typically requires no adjustment, but always confirm gap specifications per your vehicle’s service manual. Ensure the spark plug seats flat against the cylinder head to maintain proper compression and prevent leaks.

Quality Assurance and Warranty

NGK spark plugs are manufactured to meet strict quality standards, ensuring reliable performance and durability. The Standard Spark Plug 3961 undergoes rigorous testing for heat range, resistance, and electrode integrity. While specific warranty details vary by region and retailer, NGK products generally come with manufacturer-backed quality assurance to support long-term use.