NGK 7544 Spark Plug

NGK Iridium IX Spark Plug 7544 Overview

NGK Iridium IX Spark Plug 7544 is built for precise ignition performance in secondary ignition systems. It uses an iridium center electrode, a copper core, and a 5,000-ohm resistor to support stable spark delivery and consistent engine operation.

As part of the NGK Iridium IX Spark Plug line, this plug is engineered for drivers who want OE-focused construction with a fine-wire iridium tip and a tapered ground electrode design. It is a practical choice for vehicles such as Honda Civic and Toyota applications where the correct heat range and thread specifications matter.

Key Features

• Part number 7544, NGK CR7HIX cross reference
• Iridium center electrode tip material for durable spark performance
• Copper core center electrode for efficient heat transfer
• Taper cut ground electrode tip design with standard ground configuration
• 5,000-ohm resistance for ignition system noise control
• Pre-gapped at .028 for applications calling for this setting
• 10 mm thread diameter, .5 reach, and flat seat design
• Heat range 7 with 5/8 hex size and stud terminal type

Detailed Description

NGK 7544 is a spark plug designed around the specifications that matter most in modern ignition systems: electrode material, gap, heat range, and thread fitment. The iridium tip helps maintain a consistent firing edge, while the copper core supports thermal control under normal operating conditions. With a .028 pre-gap, 10 mm thread diameter, .5 reach, and flat seat, this plug is built for applications that call for those exact dimensions. It is a direct-fit style spark plug for selected Honda Civic and Toyota models, as well as other vehicles listed in the interchange data.

This part cross-references DENSO Auto Parts 5383 for the same application.

What It Helps Address

• Hard starting caused by worn or fouled spark plugs
• Rough idle from inconsistent spark delivery
• Misfire conditions tied to electrode wear or incorrect gap
• Reduced throttle response from weak ignition performance
• Maintenance replacement for vehicles requiring NGK CR7HIX / 7544 specifications

Installation Notes and Tips

Verify thread diameter, reach, seat type, heat range, and terminal style before installation. Confirm the specified gap for the engine and check the existing plug condition for signs of oil fouling, carbon buildup, or overheating. For fitment-based searches, this part is commonly referenced for Honda Civic and Toyota applications; always match the vehicle’s required plug specification before service. Fits 2006-2011 Honda Civic, front. Fits Toyota models listed in the interchange data when the engine calls for this plug specification.

Quality Assurance

NGK is a long-standing OE supplier and spark plug manufacturer with extensive coverage across domestic and import vehicles in North America. The brand’s manufacturing and distribution network supports consistent product standards for automotive ignition service.