NGK 4919 Spark Plug - Intake Side

NGK Iridium IX Spark Plug Overview

The NGK Iridium IX Spark Plug 4919 is engineered for reliable ignition performance in a range of vehicles including Acura, Honda, Lexus, Mazda, Nissan, Saab, and Toyota models. Designed with advanced materials and precise specifications, this spark plug supports efficient combustion and consistent engine operation.

• Iridium center electrode tip for enhanced durability and ignition
• Copper core center electrode for improved conductivity
• Taper cut ground electrode tip for optimized spark exposure
• Standard ground configuration with nickel ground electrode core
• Non-removable nut electrical terminal type for secure connection
• Pre-gap size of 0.044 inches for precise spark gap
• Flat seat type with 14mm thread diameter and 0.75 inch reach
• Hex size of 5/8 inch for standard installation tools
• Manufacturer heat range of 6 suitable for various engine conditions

About the NGK Iridium IX Spark Plug Line

The Iridium IX Spark Plug line from NGK is designed to provide enhanced ignition performance and longer service life compared to conventional spark plugs. Featuring an iridium center electrode tip, these plugs offer improved wear resistance and stable spark delivery. The 4919 part number is part of this line, combining iridium technology with a copper core for optimal conductivity and combustion efficiency.

Technical Details and Compatibility

This spark plug features a single ground electrode with a taper cut design made from nickel, which helps maintain a consistent spark and reduces electrode wear. The non-removable nut electrical terminal ensures a secure and reliable connection within the ignition system. With a pre-gap size of 0.044 inches and a flat seat type, the NGK 4919 spark plug fits applications requiring a 14mm thread diameter and 0.75 inch reach. It is compatible with various models such as the Honda Civic, Toyota Camry, Nissan Maxima, Acura Integra, and Mazda 323, among others.

Common Applications and Problem Solving

• Restores engine misfire issues caused by worn or fouled spark plugs
• Improves cold start performance in Acura, Honda, and Toyota vehicles
• Enhances fuel efficiency by ensuring consistent ignition
• Reduces rough idling and hesitation in Nissan and Mazda engines
• Supports stable combustion in high-performance models like the Lexus ES300 and Saab 9-5

Installation Notes and Tips

When installing the NGK Iridium IX Spark Plug 4919, ensure the spark plug gap is set to the manufacturer’s recommended specification, which is 0.044 inches for this part. Use a 5/8 inch socket for proper torque application and avoid over-tightening to prevent damage to the threads or seat. The flat seat design requires proper seating to maintain compression and prevent leaks. It is advisable to inspect the ignition system components during installation for optimal performance.

Quality Assurance and Warranty

NGK spark plugs are manufactured to meet strict quality standards, ensuring reliable performance and durability. The Iridium IX line undergoes rigorous testing for heat range, electrode wear, and electrical resistance, with this model featuring a resistance rating of 5000 ohms. While specific warranty details may vary, NGK typically offers coverage against manufacturing defects, supporting confidence in the 4919 spark plug’s long-term use.