B4000 Regular Cab 4WD V6-4.0L OHV (1997)
EGR Valve: Description and Operation
EGR VALVE
Increases or decreases flow of exhaust gas recirculation.
Operation
Uses conventional vacuum actuated valve. At vacuum signal of 1.6 in.Hg (41 mm/Hg) or less, spring force in EGR valve closes valve. Valve is fully
opened at about 4.5 in.Hg (114 mm/Hg).
