EGR System: Description

Exhaust Gas Recirculation (EGR) system is used to reduce NOx emissions. This is accomplished by recycling exhaust gases back into the intake manifold, resulting in cooler combustion temperatures and controlled NOx emissions.

EGR system used by Ford consists of an EGR valve, vacuum amplifier, vacuum reservoir, ported vacuum switch (PVS) and connecting lines and hoses.

Fig 1: Cutaway View of EGR Valve Without Back Pressure Transducer When testing, apply 8 in. Hg to EGR Valve and hold it for at least 30 seconds.