Emission Control Systems: Specifications

Canister purge control valve opening vacuum 40-80 mmHg (1.6-3.2 inHg)
Fuel tank pressure control valve opening vacuum 28 mmHg (1.1 inHg)
Evaporative emission vacuum switching valve operating temperature [1] above 60~C (140~F)
EGR thermal vacuum valve opening temperature [2] 46~-54~C (115~-129~F
EGR vacuum switching valve operating temperature [1] above 26~C (79~F)
EGR valve full open vacuum [1] 143 mmHg (5.7 inHg)
EGR valve full open vacuum [2] 178 mmHg (7.1 inHg)
Back pressure transducer control pressure:
Off less than or equal to 53.5 mmAq (2.1 inAq) [1][3]
On more than or equal to 81.5 mmAq (3.2 inAq) [1][3]
Air induction system reed valve opening vacuum [1] 200 mmHg (8 inHg)
Air induction valve opening vacuum [2] 94 mmHg (3.76 inHg)
Air induction system delay valve opening vacuum [2] 14.3 mmHg (.57 inHg)
ITC valve vacuum cut-off temperature (air cleaner) [2] 36.5~-43.5~C (98~-110~F)
Vacuum motor full open vacuum (air cleaner) [2] 158 mmHg (6.3 inHg)
Mixture control valve operating vacuum [2] 118 mmHg (4.7 inHg)

[1] Turbo
[2] Non-Turbo
[3] mmAq (inAq) is used to represent pressure or vacuum measured by the height of a column of water which it supports. This convention is used when pressure differentials are too small to accurately measure using millimeters or inches of Mercury (Hg).