Emission Control Systems: Specifications

Evaporative emission check and relief valve:
Check valve opening vacuum 25.4-35.5 mmHg (1.0-1.4 inHg)
Relief valve opening vacuum 5.0-15.2 mmHg (0.2-0.6 inHg)
Canister purge control valve opening pressure 70-110 mmHg (2.8-4.4 inHg)
Purge hose vacuum to open purge valve 380 mmHg (15.0 inHg)
EGR valve operating vacuum:
Starting approx. 50 mmHg (2.0 inHg)
Wide open approx. 80 mmHg (3.1 inHg)
EGR thermal vacuum valve opening temperature above 46~-54~C (115~-129~F)