EGR Valve: Testing and Inspection

Checking EGR Valve:

- Disconnect vacuum hose from EGR modulator.
- Connect vacuum pump gauge to its hose.
- Check that EGR valve diaphragm moves smoothly and that it is held at the same position when 20 cmHg vacuum is applied to EGR valve.
- If diaphragm doesn't move smoothly, or it isn't held at the same position, replace EGR valve.
- After checking, be sure to connect vacuum hose.