Technician A says that multi-orifice hydraulic injectors have hard value NOPs. Technician B says that NOPs in electrohydraulic injectors (EHIs) have variable NOPs that are controlled by the ECM. Who is correct?

Question

Quizplus · Accepted Answer

Multi-orifice hydraulic injectors do indeed have hard value NOPs (Nozzle Opening Pressure), meaning the pressure at which the injector nozzle opens is fixed. Electrohydraulic injectors (EHIs), on the other hand, have variable NOPs that can be adjusted by the Engine Control Module (ECM) to optimize engine performance under different conditions. Therefore, both technicians are correct in their statements.

Technician a Says That Multi-Orifice Hydraulic Injectors Have Hard Value