: It uses HEUI (Hydraulically Actuated Electronically Controlled Unit Injection), which relies on high-pressure engine oil to fire the fuel injectors.
: Because it uses oil to actuate injectors, maintaining fresh oil with the correct viscosity is critical for performance and fuel economy. Buyer's Recommendations
Experts typically consider the as the peak for this engine, as they benefited from factory intercooling and electrical lift pumps. Late-model engines (2001–2003) occasionally used PMRs (Powdered Metal Rods) , which are considered slightly less desirable for high-horsepower performance modifications than the earlier forged steel rods. 1994-1997 Ford 7.3L Powerstroke Buyer's Guide - XDP