NGK 91794 Spark Plug

Reliable Ignition Performance for Select Vehicle Models

The NGK Laser Iridium Spark Plug 91794 is engineered to deliver consistent ignition and efficient combustion for a range of vehicles including Buick, Cadillac, Ford, Jaguar, Land Rover, Lincoln, and Suzuki models. Designed with precision materials and specifications, this spark plug supports optimal engine performance and fuel efficiency.

• Iridium center electrode tip for enhanced durability and ignition
• Standard ground electrode design with nickel core material
• Resistor type spark plug with 5000 ohm resistance to reduce electrical noise
• Pre-gapped to .030 inches for precise spark delivery
• Tapered seat type with 14mm thread diameter and 25mm reach
• Non-removable nut electrical terminal for secure connection
• Compatible with multiple makes and models including Ford Mustang, Lincoln MKZ, and Land Rover Discovery Sport

About the NGK Laser Iridium Spark Plug Line

The Laser Iridium Spark Plug line from NGK is designed to provide a balance of longevity and reliable ignition performance. Featuring an iridium center electrode tip, these plugs offer improved wear resistance compared to conventional spark plugs. The copper core center electrode enhances thermal conductivity, while the resistor design helps minimize radio frequency interference. This combination supports stable engine operation across a variety of driving conditions.

Technical Specifications and Features

This NGK spark plug (part number 91794) features a single ground electrode with a nickel core, providing a standard ground configuration optimized for consistent spark generation. The 5/8 inch hex size allows for straightforward installation and removal. With a manufacturer heat range of 6, it is suitable for engines requiring moderate heat dissipation. The insulator height of 52.5 mm and tapered seat ensure proper fitment and sealing in compatible cylinder heads.

Applications and Problem Solving

• Restores reliable ignition in Buick LaCrosse and Cadillac CTS engines
• Improves combustion efficiency in Ford Edge and Explorer models
• Reduces misfires and rough idling in Land Rover Range Rover Evoque
• Helps maintain fuel economy in Lincoln Navigator and MKC vehicles
• Supports smooth engine start-up in Suzuki Grand Vitara and XL-7

Installation Notes and Tips

Ensure the spark plug gap is set to the factory specification of .030 inches before installation. Use a torque wrench to tighten the plug to the vehicle manufacturer’s recommended torque to avoid damage to the tapered seat. The non-removable nut terminal requires compatible ignition wires or coil packs. Inspect the cylinder head threads for damage prior to installation to ensure proper fitment.

Quality Assurance and Warranty

NGK spark plugs are manufactured to meet strict quality standards for durability and performance. The Laser Iridium Spark Plug 91794 includes a resistor to reduce electrical interference and is built with premium materials such as iridium and copper for longevity. While specific warranty details vary by region, NGK products typically come with a limited warranty against manufacturing defects.