NGK 7390 Spark Plug

Reliable Ignition Performance for Mercury and Nissan Vehicles

The NGK V-Power Spark Plug 7390 is engineered to deliver consistent ignition performance for select Mercury and Nissan models. 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 with a single nickel ground electrode
• Center Electrode: Copper core with nickel tip for balanced conductivity and durability
• Pre-Gap Size: Factory set at 0.036 inches for precise spark delivery
• Thread Diameter: 14 mm with a 0.75-inch reach and flat seat type
• Hex Size: 5/8 inch for standard installation tools
• Electrical Terminal: Non-removable nut type for secure connection
• Manufacturer Heat Range: 5, suitable for moderate operating temperatures
• Insulator Height: 50.50 mm for proper insulation and heat dissipation

About the NGK V-Power Spark Plug Line

The V-Power Spark Plug line from NGK is designed to provide reliable ignition components that meet OEM specifications. This product line focuses on delivering consistent spark performance and durability through quality materials such as copper core electrodes and nickel tips. The 7390 part number within this line is tailored for secondary ignition systems in specific Mercury and Nissan vehicles, ensuring compatibility and dependable operation.

Technical Details and Compatibility

The NGK 7390 spark plug features a copper core center electrode with a nickel tip, which balances electrical conductivity and wear resistance. The single ground electrode made of nickel provides a stable spark path. With a resistance of 5000 ohms, this spark plug helps reduce radio frequency interference while maintaining ignition efficiency. The flat seat and 14 mm thread diameter ensure proper fitment in compatible engines. This spark plug is compatible with Mercury Quest and Nissan Villager models, making it a suitable replacement part for these vehicles.

Common Applications and Issues Addressed

• Restores proper ignition timing and spark delivery
• Reduces misfires and rough idling in Mercury Quest and Nissan Villager
• Improves fuel efficiency by ensuring complete combustion
• Prevents ignition system interference with 5000 ohm resistance
• Maintains engine performance under moderate heat conditions (heat range 5)

Installation Notes and Tips

When installing the NGK V-Power Spark Plug 7390, ensure the spark plug gap is set to the factory pre-gap of 0.036 inches. Use a 5/8 inch socket for installation and tighten to the vehicle manufacturer’s torque specifications. The non-removable nut terminal type requires a secure connection to the ignition wire. Inspect the spark plug seat and threads for cleanliness before installation to avoid cross-threading or poor sealing.

Quality Assurance and Warranty

NGK spark plugs are manufactured to meet strict quality standards, ensuring reliable performance and durability. The V-Power Spark Plug 7390 undergoes rigorous testing for electrical resistance, heat range, and material integrity. While specific warranty details are not provided here, NGK products typically come with manufacturer-backed quality assurance to support their use in OEM and replacement applications.