NGK 90526 Spark Plug

NGK Laser Iridium Spark Plug 90526

NGK 90526 is a Laser Iridium spark plug built for precise ignition performance in modern gasoline engines. It combines an iridium center electrode tip with a copper core and a tapered-cut ground electrode to support consistent spark delivery and stable combustion.

As part of the NGK Laser Iridium Spark Plug line, this plug reflects NGK’s OE-focused engineering and broad coverage across domestic and import vehicles. It is a direct-fit style spark plug for applications that call for NGK part number 90526, including select Honda Civic and Toyota Corolla service needs where the specified heat range and gap are required.

Key Features

• NGK Laser Iridium Spark Plug line for OE-style ignition service
• Iridium center electrode tip for durable spark performance
• Copper core center and ground electrodes for efficient heat transfer
• Taper-cut ground electrode design for focused spark exposure
• Resistor type plug with 5,000 ohm resistance
• Pre-gapped at 0.031 in for specified applications
• Flat seat design, 10.00 mm thread diameter, 26.5 mm reach
• Manufacturer heat range 9 with 14 mm hex size

Detailed Description

NGK 90526, also identified as LMAR9AI-8D, is engineered for engines that require a fine-wire iridium spark plug with a 0.031 in pre-gap and a 9 heat range. The non-removable nut terminal, standard ground configuration, and flat seat design support secure installation in the correct cylinder head application. This spark plug is built to meet the demands of modern ignition systems where consistent firing and reliable electrical resistance matter.

NGK’s long OE supply history and North American manufacturing and distribution footprint support dependable parts availability for service work on vehicles such as Honda Civic and Toyota Corolla. If your repair calls for NGK 90526, this plug is specified to match the required dimensions and electrode design for that application.

What It Helps Address

• Rough idle caused by worn or fouled spark plugs
• Hard starting from weak or inconsistent ignition output
• Misfire conditions related to excessive plug wear
• Reduced fuel efficiency from incomplete combustion
• Loss of throttle response from degraded spark quality

Installation Notes and Tips

Verify the engine calls for NGK 90526 / LMAR9AI-8D before installation. Confirm thread diameter, reach, seat type, and heat range against the vehicle service specification, and inspect the plug well and ignition coil condition during service. Use the specified torque procedure for the cylinder head material and avoid altering the pre-gap unless the application data requires it.

For fitment-based searches, this part is commonly referenced for select Honda Civic and Toyota Corolla applications where NGK 90526 is specified. Always match the exact engine and model-year requirements before replacement.

Quality Assurance

NGK is a major OE spark plug supplier with more than 80 years of automotive experience, and this plug is produced to support original-equipment-level durability and performance expectations. Part number 90526 is backed by NGK’s established ignition expertise and global manufacturing standards.