NGK 90992 Spark Plug

NGK Laser Iridium Spark Plug 90992

NGK 90992 is a Laser Iridium High Ignitability spark plug built for precise ignition performance and OE-style durability. It uses an iridium center electrode, a square platinum ground electrode tip, and a copper core to support consistent spark delivery in demanding engine conditions.

Compatible With select Honda Civic and Toyota Corolla applications where NGK 90992 is specified, this spark plug is part of NGK’s Laser Iridium High Ignitability line. That product line focuses on stable ignition characteristics, fine-wire electrode design, and original-equipment standards for everyday drivability and long service life.

Key Features

• Laser Iridium High Ignitability design for precise spark initiation
• Iridium center electrode tip material for strong ignition performance
• Square platinum ground electrode tip design for improved ignitability
• Copper center electrode core for efficient heat transfer
• Nickel ground electrode core material and standard ground configuration
• 5000 ohm resistance for ignition system compatibility
• Flat seat, 10.00 mm thread diameter, 26.5 reach, and 14 mm hex size
• Pre-gapped at .036 for specified applications

Detailed Description

NGK 90992, also referenced as SILMAR8A9S, is engineered as a direct-fit spark plug for applications that call for a Laser Iridium High Ignitability design. The fine iridium center electrode and square platinum ground electrode tip help promote reliable spark formation, while the copper core supports thermal control. As an OE-focused ignition component from NGK, this plug is suited for drivers looking for stable starting, smooth combustion, and consistent engine response in the correct Honda Civic or Toyota Corolla application.

This part cross-references NGK (e.g., 90992) for the same application.

What It Helps Address

• Hard starting caused by worn or fouled spark plugs
• Rough idle from weak or inconsistent ignition
• Misfire conditions related to degraded plug electrodes
• Reduced throttle response from inefficient combustion
• Maintenance replacement for specified Honda Civic and Toyota Corolla ignition service

Installation Notes and Tips

Verify the engine calls for NGK 90992 before installation. Confirm thread diameter, reach, seat type, heat range, and pre-gap specification against the service information for the vehicle. Use proper spark plug removal and torque procedures, and inspect ignition coils and plug wells for wear or contamination before installing the new plug.

Quality Assurance

NGK is a major OE spark plug supplier in North America with decades of automotive manufacturing experience. The brand’s OE-oriented production standards and broad vehicle coverage support consistent part quality for specified ignition applications.