NGK 3901 Spark Plug

Reliable Ignition with NGK Standard Spark Plug 3901

The NGK Standard Spark Plug 3901 is engineered to provide consistent ignition performance for a variety of vehicles. 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 and Configuration: Standard design for dependable spark delivery
• Core Materials: Copper center electrode with nickel tip and nickel ground electrode core
• Pre-Gap Size: .036 inches for precise spark gap
• Thread Diameter: 10.00 mm with a 5/8 inch hex size for secure fitment
• Insulator Height: 50.00 mm and flat seat type for proper sealing
• Manufacturer Heat Range: 7, suitable for moderate engine temperatures
• Electrical Terminal Type: Stud for reliable connection
• Reach: .75 inches ensuring compatibility with various engine designs

About the NGK Standard Spark Plug Line

The Standard Spark Plug line by NGK offers dependable ignition components designed to meet OEM specifications. These spark plugs are built with quality materials such as copper and nickel to ensure consistent performance and durability. The 3901 part number is part of this line, providing a balance of reliability and value for everyday driving conditions.

Technical Details and Application

The NGK 3901 spark plug features a copper core center electrode with a nickel tip, enhancing conductivity and wear resistance. The single ground electrode with a standard tip design ensures stable spark generation. With a resistance of 5000 ohms, it helps reduce radio frequency interference while maintaining ignition efficiency. The flat seat and 10 mm thread diameter allow for proper installation in compatible engines. This spark plug is suitable for vehicles requiring a heat range 7 plug and a pre-gap of .036 inches.

Common Issues Addressed by NGK 3901 Spark Plug

• Misfiring or rough idling due to worn or fouled spark plugs
• Difficulty starting the engine caused by inconsistent spark
• Reduced fuel efficiency from incomplete combustion
• Engine hesitation or power loss under load
• Excessive emissions linked to poor ignition performance

Installation Notes and Tips

Before installation, verify the spark plug gap is set to .036 inches to match engine requirements. Use a torque wrench to tighten the spark plug to the manufacturer’s recommended specification to avoid damage. The 5/8 inch hex size allows for standard spark plug socket compatibility. Ensure the spark plug threads are clean and free of debris to prevent cross-threading. The stud-type electrical terminal requires a compatible ignition wire connection.

Quality Assurance and Warranty

NGK spark plugs are manufactured to meet strict quality standards, ensuring reliable ignition performance. The Standard Spark Plug line, including part number 3901, undergoes rigorous testing for durability and consistency. While specific warranty details may vary, NGK products typically come with manufacturer-backed quality assurance to support long-term use.