EGR Valve: Testing and Inspection

1) Disconnect vacuum hose from EGR solenoid vacuum valve (for system check).





2) Connect vacuum pump gauge to its hose.
3) Check that EGR valve diaphragm moves smoothly and that it is held at the same position when 20 cm Hg vacuum is applied to EGR valve. If diaphragm fails to move smoothly, or it isn't held at the same position, replace EGR valve.
4) After checking, be sure to connect vacuum hose.