NGK 90909 Spark Plug

NGK Laser Iridium Spark Plug 90909

NGK 90909 is a Laser Iridium spark plug built for OE-style ignition performance in select Hyundai and Kia applications. It uses an iridium center electrode, a copper core, and a 5,000 ohm resistor to support stable spark delivery and consistent combustion.

The Laser Iridium Spark Plug line is engineered around original equipment standards, with NGK drawing on decades of OE supply experience for domestic and import vehicles. For drivers servicing a Kia Forte, Kia Soul, Hyundai Elantra, or Hyundai Kona, this plug is specified for direct replacement use in confirmed applications.

Key Features

• Laser Iridium center electrode tip material for precise spark delivery
• Copper core center and ground electrode construction
• 5,000 ohm resistor for ignition noise suppression
• Flat seat design with 12 mm thread diameter and 1.04 in reach
• Pre-gapped at 0.031 in
• Standard ground configuration with one ground electrode
• Heat range 8 for specified OE-style applications
• Part number 90909; NGK part number ILZKR8C8G

Detailed Description

NGK 90909 is a Laser Iridium spark plug intended for modern small-displacement engines that call for a fine-wire iridium electrode and OE-equivalent dimensions. The iridium tip supports consistent ignition performance, while the copper core construction helps manage heat transfer in normal service. With a flat seat, stud terminal, and 0.031 in pre-gap, this plug is built to match the requirements listed for covered Hyundai and Kia models.

Compatible With select 2016-2025 Kia Forte, Kia Forte5, Kia Soul, Kia Seltos, Hyundai Elantra, Hyundai Kona, and Hyundai Veloster applications. This part cross-references Dorman - Conduct-Tite 90909 for the same application.

What It Is Used For

• Replacing worn spark plugs that cause rough idle
• Restoring ignition performance after misfire-related service
• Addressing hard starting in covered Hyundai and Kia engines
• Supporting fuel economy loss tied to degraded spark plug condition
• Correcting hesitation or weak acceleration from ignition wear

Installation Notes and Tips

• Verify engine application by year, make, model, and notes before ordering.
• Check the specified gap and confirm it matches the engine requirement before installation.
• Use proper spark plug removal and torque procedures to avoid thread damage.
• Inspect ignition coils and boots during service, especially on higher-mileage vehicles.
• For fitment language, examples include Fits 2021-2025 Kia Seltos, N/A; Fits 2018-2020 Hyundai Elantra, N/A; Fits 2017-2020 Kia Forte, N/A.

Quality Assurance

NGK is a long-established OE supplier and manufacturer of spark plugs for domestic and import vehicles in North America, with production and distribution support across North America and global facilities. The brand’s OE-focused manufacturing approach and broad vehicle coverage make NGK 90909 a technical replacement choice for covered Hyundai and Kia service applications.