NGK 2391 Spark Plug

Reliable Ignition Performance for Acura and Honda Vehicles

The NGK V-Power Spark Plug 2391 is engineered to deliver consistent ignition performance for select Acura and Honda models. Designed with durable materials and precise specifications, this spark plug supports efficient combustion and engine reliability.

• Resistance: 5000 ohms for optimal electrical performance
• Special side ground electrode tip design for improved spark control
• Nickel ground electrode core and tip for durability
• Copper center electrode core with nickel tip for effective conductivity
• Pre-gap size of 0.044 inches for precise ignition timing
• Flat seat type with 14mm thread diameter and 0.75 inch reach
• Non-removable nut electrical terminal type for secure connection
• Hex size of 5/8 inch for standard installation tools
• Manufacturer heat range of 5 suitable for moderate engine temperatures
• Insulator height of 50.50 mm for proper fitment

About the NGK V-Power Spark Plug Line

The V-Power Spark Plug line by NGK focuses on delivering reliable secondary ignition components that meet OEM specifications. This product line emphasizes consistent electrical resistance and electrode design to maintain stable combustion and engine performance. The 2391 part number within this line is tailored for specific Acura and Honda models, ensuring compatibility and durability under typical driving conditions.

Technical Details and Compatibility

The NGK V-Power Spark Plug 2391 features a single ground electrode with a special side ground tip design, enhancing spark efficiency and reducing misfires. The combination of a copper core center electrode and nickel materials for the electrodes provides a balance of conductivity and wear resistance. With a pre-gap size of 0.044 inches and a flat seat, this spark plug fits securely in engines requiring a 14mm thread diameter and 0.75 inch reach. It is compatible with Acura Passport, Honda RL, SLX, and TL models, making it a suitable replacement part for these vehicles.

Common Applications and Problem Solving

• Restores proper ignition in Acura Passport and Honda RL engines
• Reduces engine misfires and rough idling in Honda SLX and TL
• Improves fuel efficiency by ensuring consistent spark delivery
• Addresses ignition coil stress caused by worn spark plugs
• Helps maintain engine performance and emissions compliance

Installation Notes and Tips

When installing the NGK V-Power Spark Plug 2391, ensure the engine is cool to prevent damage to the threads. Use a 5/8 inch socket for proper torque application and verify the pre-gap size of 0.044 inches before installation. The non-removable nut terminal type requires a secure connection to the ignition wire. Follow manufacturer torque specifications to avoid over-tightening, which can damage the spark plug or cylinder head.

Quality Assurance and Warranty

NGK spark plugs are manufactured to meet strict quality standards, ensuring reliable performance and durability. The V-Power Spark Plug 2391 undergoes rigorous testing for electrical resistance and material integrity. While specific warranty details may vary, NGK typically offers coverage against manufacturing defects. Always consult NGK or authorized distributors for warranty information related to this part number.