NGK 6966 Spark Plug

NGK Laser Iridium Spark Plug 6966

NGK Laser Iridium Spark Plug 6966 is built for drivers who want precise ignition performance and OE-style reliability. This spark plug uses an iridium center electrode tip, a nickel ground electrode, and a 0.036 pre-gap to support consistent spark delivery in modern ignition systems.

Part number 6966, also identified as IMR9A-9H, is part of NGK’s Laser Iridium line, a product family focused on OE-level construction and durable ignition performance. It is a direct-fit style spark plug for applications that call for a 10 mm thread, 0.75 reach, flat seat, and 5/8 hex.

Key Features

• Laser Iridium spark plug with iridium center electrode tip material
• Nickel ground electrode with standard ground configuration
• 5000 ohm resistance for ignition system compatibility
• 0.036 pre-gap size for factory-style setup
• 10 mm thread diameter, 0.75 reach, and flat seat design
• Stud terminal type with 5/8 hex size
• Manufacturer heat range 9 for specified engine applications
• NGK part number 6966 / IMR9A-9H

Detailed Description

NGK 6966 is a Laser Iridium spark plug engineered for engines that require a fine-wire iridium center electrode and OE-style fitment dimensions. The copper core center electrode supports heat transfer, while the nickel ground electrode and standard single-ground design help maintain stable ignition characteristics. For shoppers searching for an NGK spark plug 6966, IMR9A-9H, or a Laser Iridium replacement for select Honda Civic and Acura applications, this plug matches the specifications commonly required in performance-focused and late-model ignition systems.

NGK has long supplied original equipment spark plugs for domestic and import vehicles in North America, and this part reflects that OE-oriented approach. If you are cross-shopping ignition service parts for Honda Civic or Acura models, part number 6966 is a relevant reference for applications that specify this exact plug design and heat range.

This part cross-references Gates 6966 for the same application.

What It Helps Address

• Engine misfire caused by worn or fouled spark plugs
• Hard starting from weak or inconsistent spark output
• Rough idle related to degraded ignition performance
• Reduced throttle response from aging plugs
• Fuel economy loss tied to inefficient combustion

Installation Notes and Tips

Verify the required thread diameter, reach, seat type, and heat range before installation. Check the gap against the engine specification before threading the plug into the cylinder head, and use the correct torque procedure for the application. For fitment-based searches, confirm the exact engine callout on Honda Civic and Acura models before ordering NGK 6966.

Quality Assurance

NGK is a major OE spark plug supplier with decades of automotive manufacturing experience and broad coverage across domestic and import vehicle applications. Part number 6966 is produced to support original-equipment standards for durability and consistent ignition performance.