Cutlass Ciera FWD L4-151 2.5L (1982)
Thermal Vacuum Valve - Carb: Testing and Inspection
Secondary Vacuum Break TVS
With the engine at normal operating temperature, the SVB-TVS should be open.
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Apply vacuum to the inlet port--on top of the TVS--and check for vacuum at the outlet. If there is no vacuum, replace the TVS.
