
GM LS Gen III 3-Wire Mass Airflow Sensor to GM LS Gen IV LS3 Mass Airflow Sensor Wiring Harness
JEGS 555-40617 Airflow Sensor Wiring Harness Features:
- This 1-piece wire adapter harness is designed for converting the smaller 78 mm LS1 3-wire mass airflow (MAF) sensor to the larger 5-wire LS3 car-style MAF with an integrated intake air temperature (IAT) sensor
- Built using factory-style connectors, seals, and high-quality terminals to ensure a secure, reliable connection with your LS3 MAF sensor
- This plug-and-play adapter harness eliminates the need for cutting or splicing wires, allowing for a quick and clean installation when upgrading to an LS3 MAF sensor
- Manufactured with high-quality automotive-grade wiring for maximum durability, ensuring consistent signal transmission and long-lasting performance
- Designed with standard aftermarket wire color coding, making identification and connection easier during installation
- Ideal for performance builds, engine swaps, or upgrades requiring the larger LS3 MAF sensor for improved airflow and accurate air/fuel ratios
- Converting to the LS3 MAF sensor requires proper ECU tuning and rescaling of MAF tables to ensure optimal engine performance and accurate air/fuel mixture
Seamlessly Connect Your LS Engine Swap
Simplify your LS engine swap with JEGS GM LS Wiring Harness Adapters. Designed to connect factory or aftermarket LS wiring harnesses to your vehicle’s existing electrical system, these adapters eliminate the hassle of splicing or modifying wires. Built with high-quality materials for maximum durability and a secure fit, JEGS wiring harness adapters ensure a clean and professional installation. Whether you're upgrading a classic muscle car or modernizing your project vehicle, JEGS has the solution to make your LS swap easy and reliable.





![61-Piece Heat Shrink Tubing Kit [Black]](https://www.jegs.com/images/mini_200/500/555/555-10630.jpg)



![Colored Electrical Tape [5 pack]](https://www.jegs.com/images/mini_200/500/555/555-w549.jpg)
![14-Gauge Premium Automotive Wire Black [50 ft.]](https://www.jegs.com/images/mini_200/500/555/555-10800.jpg)
![14-Gauge Premium Automotive Wire Red [50 ft.]](https://www.jegs.com/images/mini_200/500/555/555-10801.jpg)
![16-Gauge Premium Automotive Wire Black [50 ft.]](https://www.jegs.com/images/mini_200/500/555/555-10850.jpg)
![16-Gauge Premium Automotive Wire Red [50 ft.]](https://www.jegs.com/images/mini_200/500/555/555-10851.jpg)
![18-Gauge Premium Automotive Wire Red [100 ft.]](https://www.jegs.com/images/mini_200/500/555/555-11321.jpg)
![18-Gauge Premium Automotive Wire Black [100 ft.]](https://www.jegs.com/images/mini_200/500/555/555-11320.jpg)


![Nylon Wire and Cable Ties [8 in. Black]](https://www.jegs.com/images/mini_200/500/555/555-10605.jpg)

