NGK 90654 Spark Plug

NGK Laser Iridium High Ignitability Spark Plug Overview

The NGK Laser Iridium High Ignitability Spark Plug 90654 is engineered for reliable ignition performance in select Infiniti and Mercedes-Benz vehicles. Designed with advanced materials and precise specifications, this spark plug supports efficient combustion and consistent engine operation.

• Iridium center electrode tip for enhanced durability and ignition
• Copper core in both center and ground electrodes for optimal conductivity
• Square platinum ground electrode tip designed for high ignitability
• Standard ground configuration with a single ground electrode
• Pre-gap size of 0.028 inches for precise spark delivery
• Flat seat type with 12.00 mm thread diameter and 26.5 mm reach
• Compatible with various Infiniti and Mercedes-Benz models including Q50, C300, and Sprinter 2500

About the Laser Iridium High Ignitability Spark Plug Line

The Laser Iridium High Ignitability Spark Plug line by NGK focuses on delivering improved ignition performance through the use of iridium and platinum materials. This product line is designed to provide a stable spark with reduced voltage requirements, which can contribute to smoother engine starts and better fuel efficiency. The 90654 part number is a specific fitment within this line, tailored for secondary ignition systems in select luxury and commercial vehicles.

Technical Details and Features

This NGK spark plug features a copper core center electrode with an iridium tip, combining excellent electrical conductivity with high wear resistance. The ground electrode uses a copper core with a square platinum tip, enhancing ignitability and ensuring consistent spark generation. The spark plug has a resistance rating of 1000 ohms, which helps reduce electrical noise and interference. Its flat seat design and 14 mm hex size facilitate proper installation and secure fitment. The insulator height of 50 mm and a manufacturer heat range of 8 make it suitable for the thermal demands of the compatible engines.

Compatible Vehicles and Applications

• Infiniti Q50, Q60, QX30 models
• Mercedes-Benz C300, C350e, CLA250, E300, GLA250, GLC300, GLC350e
• Mercedes-Benz Sprinter 1500, Sprinter 2500, Metris
• Mercedes-Benz SLC300, SLK300, B250

This spark plug is designed for secondary ignition systems in these vehicles, supporting efficient combustion and engine performance.

Common Issues Addressed by NGK 90654 Spark Plug

• Misfiring or rough idling due to worn or inefficient spark plugs
• Difficulty starting the engine in cold or damp conditions
• Reduced fuel efficiency caused by incomplete combustion
• Engine hesitation or loss of power under acceleration
• Electrical interference affecting ignition system performance

Installation Notes and Tips

Ensure the spark plug gap is set to the specified pre-gap size of 0.028 inches before installation. Use a torque wrench to tighten the spark plug to the manufacturer’s recommended torque to avoid damage to the threads or seat. The 14 mm hex size allows for standard spark plug socket compatibility. Inspect the ignition system components for wear or damage during replacement to maintain optimal performance.

Quality Assurance and Warranty

NGK spark plugs are manufactured to meet strict quality standards, ensuring reliable performance and durability. The Laser Iridium High Ignitability Spark Plug 90654 undergoes rigorous testing for electrical resistance, electrode wear, and heat tolerance. While specific warranty details are not provided, NGK products typically come with manufacturer-backed quality assurance to support long-term use in compatible Infiniti and Mercedes-Benz vehicles.