NGK 94940 Spark Plug

Reliable Ignition Performance for Jaguar and Land Rover Vehicles

The NGK Laser Iridium Spark Plug 94940 is engineered to deliver consistent ignition and efficient combustion for select Jaguar and Land Rover models. Designed with durable materials and precise specifications, this spark plug supports optimal engine performance and fuel efficiency.

• Iridium center electrode tip for enhanced durability and stable ignition
• Copper core center electrode to improve conductivity and heat dissipation
• Standard ground electrode design with nickel core material
• Non-removable nut electrical terminal type for secure connection
• Pre-gap size of 0.040 inches for precise spark gap
• Flat seat type with 26.5 mm reach and 12 mm thread diameter
• Hex size of 14 mm for easy installation
• Manufacturer heat range rating of 7 suitable for high-performance engines

About the NGK Laser Iridium Spark Plug Line

The Laser Iridium Spark Plug line from NGK combines iridium's high melting point with advanced electrode design to provide long service life and reliable ignition. This product line is tailored for vehicles requiring precise spark plug specifications, such as the Jaguar F-Type and Land Rover Range Rover models, ensuring consistent combustion and engine responsiveness.

Technical Details and Compatibility

The NGK 94940 spark plug features a single ground electrode with a nickel core, paired with a copper core center electrode tipped with iridium. This combination enhances electrical conductivity and electrode durability. The flat seat design and 26.5 mm reach ensure proper fitment in engines designed for this configuration. The non-removable nut terminal type provides a secure electrical connection, reducing the risk of loosening under vibration. This spark plug is compatible with Jaguar models including the F-Type, XF, XFR, XJ, XJR, XK, and their performance variants, as well as Land Rover models such as the LR4, Range Rover, and Range Rover Sport.

Common Applications and Problem Solving

• Restores consistent ignition in engines experiencing misfires
• Improves fuel efficiency by ensuring optimal spark delivery
• Reduces rough idling caused by worn or damaged spark plugs
• Supports smooth acceleration and engine responsiveness
• Helps maintain emissions compliance by promoting complete combustion

Installation Notes and Tips

Before installation, verify the spark plug gap is set to 0.040 inches as specified. Use a torque wrench to tighten the spark plug to the manufacturer’s recommended torque to avoid damage to the threads or seat. The 14 mm hex size allows for standard spark plug socket compatibility. Ensure the ignition system is off and the engine is cool before replacing spark plugs. Proper installation will help maintain engine performance and prevent potential ignition issues.

Quality Assurance and Warranty

NGK spark plugs are manufactured to meet strict quality standards, ensuring reliable performance and durability. The Laser Iridium Spark Plug 94940 undergoes rigorous testing for heat range, electrode wear, and electrical resistance (5000 ohms) to maintain consistent ignition characteristics. While specific warranty details may vary, NGK products typically come with manufacturer-backed quality assurance to support long-term use in compatible Jaguar and Land Rover vehicles.