Firebird V8-305 5.0L (1982)
Thermal Vacuum Valve: Testing and Inspection
EGR-TCV
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This valve is used on some engines in the vacuum line to the EGR valve.
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The valve is closed below 61° F to block the vacuum to the EGR valve permitting better cold engine operation.
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The valve is open above 76° F permitting normal EGR operation.
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If vacuum is present at the EGR valve when engine coolant temperature is below 61° F, or there is no vacuum present when temperature is above
76° F, replace the valve.
NOTE: Refer to the number stamped on the base of the switch or valve for calibrated switching or activation temperatures.
