Ford PowerStroke 7.3L AD HEUI Injector for 1999-2003 E and F Series, 1999-2003 Navistar T444E Overview
Ford PowerStroke 7.3L AD HEUI Injector for 1999-2003 E and F Series, 1999-2003 Navistar T444E is a critical component used in diesel engines, specifically designed for the 1999-2003 Ford E and F Series vehicles, as well as the Navistar T444E engines from the same period. The acronym HEUI stands for Hydraulic Electronic Unit Injector, which is a type of fuel injection system that uses hydraulic energy to pressurize fuel and electronic controls to manage injection timing and quantity.
Applications and Compatibility
The AD type injector is compatible with several vehicle models and engine configurations:
- Ford Vehicles: It fits the 1999-2003 Ford F-Series and E-Series vehicles built after December 7, 1998. This includes models such as the Excursion (2000-2003), Econoline Super Duty (1999), E-350 Club Wagon (2003), E-450 Super Duty (2003), F-250 Super Duty (1999-2003), F-350 Super Duty (1999-2003), F-450 Super Duty (1999-2003), F-550 Super Duty (1999-2003), F-650 (2000-2003), and F-750 (2000-2003).
- Navistar T444E Engines: The injector is also applicable for Navistar T444E engines with serial numbers ranging from 843,990 to 5,999,999. These include various series such as the IC Corporation models from 2002 to 2004, including school buses and commercial vehicles.
Technical Specifications
The AD injector is known as a “Prime” or “Split Shot” injector. This design helps improve fuel atomization and combustion efficiency by delivering two separate injections per cycle: a small pilot injection followed by the main injection. This technology reduces emissions and enhances engine performance.
Replacement Recommendations
For optimal performance, it is recommended to replace the AD injector in the #8 cylinder location with an AE injector to eliminate what is known as “cackle,” a common noise issue in these engines. This recommendation became standard practice in production following technical bulletins issued by Ford.
