NGK 6216 Spark Plug

NGK Iridium IX Spark Plug 6216 Overview

NGK Iridium IX Spark Plug 6216 is a secondary ignition spark plug built with an iridium center electrode and a copper core for stable ignition performance. It uses a 5,000 ohm resistor, a flat seat, and a .036 pre-gap size to support consistent spark delivery in the correct application.

As part of the NGK Iridium IX Spark Plug line, this plug reflects NGK’s OE-focused manufacturing background and broad coverage across domestic and import vehicles, including applications such as Honda Civic and Toyota Corolla where the correct heat range and thread specifications matter.

Key Features

• Iridium center electrode tip material for precise spark delivery
• Copper center electrode core material for dependable conductivity
• Nickel ground electrode core material with standard ground configuration
• Taper cut ground electrode tip design for efficient spark exposure
• 5,000 ohm resistance for ignition system noise control
• Heat range 9, 10 mm thread diameter, .75 reach, and flat seat
• 5/8 hex size and stud terminal type for specified engine applications
• NGK part number 6216, also identified as CR9EHIX-9

Detailed Description

NGK 6216 is an Iridium IX spark plug engineered for engines that call for a 10 mm, flat-seat plug with a .75 reach and a .036 pre-gap. The iridium tip helps maintain a consistent firing point, while the copper core and nickel ground electrode support reliable heat transfer and ignition performance in the specified engine design. This plug is a direct-fit style component for applications that match the listed dimensions and heat range, including select Honda Civic and Toyota Corolla engine setups.

This part cross-references AMS Automotive 4142 and 6216 for the same application.

What It Helps Address

• Misfires caused by worn or eroded spark plug electrodes
• Hard starting from weak or inconsistent ignition output
• Rough idle related to degraded spark quality
• Reduced throttle response from incorrect plug wear or gap condition
• Ignition noise concerns where resistor-equipped plugs are specified

Installation Notes and Tips

Verify the engine’s required thread diameter, reach, seat type, heat range, and terminal style before installation. Check the existing gap against the specified .036 pre-gap size and confirm the plug matches the vehicle’s ignition system requirements. For best results, install only in engines that call for NGK CR9EHIX-9 / 6216 specifications, and follow the vehicle manufacturer’s torque procedure.

Quality Assurance

NGK is a long-established OE spark plug manufacturer with North American coverage for domestic and import vehicles. The brand’s manufacturing focus centers on original-equipment standards, durability, and consistent operational performance across automotive applications.