NGK 97977 Spark Plug

NGK Iridium IX Spark Plug for GM Turbo Applications

NGK Iridium IX Spark Plug 97977 is a performance-grade ignition component built for precise spark delivery, stable idle quality, and strong throttle response. It is engineered with a fine-wire iridium center electrode, a tapered cut ground electrode, and a 0.028 in. pre-gap for select Buick, Chevrolet, and GMC applications.

The Iridium IX line focuses on durable ignition performance for modern engines that demand consistent firing under heat and load. For drivers servicing a Chevrolet Equinox, Chevrolet Malibu, or GMC Terrain, part number 97977 provides a direct-fit spark plug option with the correct thread, reach, and seat design for listed applications.

Key Features

• NGK Iridium IX performance spark plug
• Part number 97977 / service number LNAR8AIX-P
• Iridium fine-wire center electrode for durable spark delivery
• Taper cut ground electrode for improved starting, idle quality, and throttle response
• 0.028 in. pre-gap for listed fitments
• Resistor design with 5,000 ohm resistance
• Tapered seat, M12 x 1.25 thread, 25.0 mm reach
• Heat range 8 for specified engine applications

Product Details

NGK Iridium IX Spark Plug 97977 uses an iridium center electrode with a fine-wire design and a platinum ground tip to support consistent ignition performance in modern gasoline engines. The ceramic insulator, nickel ground core, and resistor construction are specified for stable operation, while the tapered cut ground electrode helps promote cleaner starts and smoother response. This part cross-references Dorman - HELP 97977 for the same application.

Compatible With select Buick Encore GX, Buick Envista, Chevrolet Equinox, Chevrolet Malibu, Chevrolet Trailblazer, Chevrolet Trax, GMC Terrain, Buick Encore, Buick Cascada, and Chevrolet Cruze applications. Part number 97977 is also listed under service number LNAR8AIX-P.

What This Spark Plug Helps Address

• Rough idle caused by worn or fouled spark plugs
• Hard starting from weakened ignition output
• Throttle hesitation during acceleration
• Misfire symptoms related to plug wear or incorrect gap
• Reduced fuel economy from inconsistent combustion

Installation Notes and Tips

Verify engine application by year, make, model, and engine code before installation. Check the specified gap of 0.028 in. against the vehicle service information before use, and inspect coil boots and ignition components at the same time to avoid repeat misfire concerns. Use proper torque procedures for the tapered seat design and confirm the plug threads match the cylinder head specification.

Quality Assurance

NGK is a recognized ignition component manufacturer with a focus on durable electrode materials and modern engine requirements. The iridium center electrode is designed for high-temperature durability, and the plug construction is intended to maintain stable ignition performance across the listed GM applications.