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EFE/TVS System

  1. With engine cold (coolant temperature at 120°F or cooler), disconnect hose from port "D" (or "2") on TVS and connect vacuum gauge to port. Start engine, if hoses are connected properly, full manifold vacuum should be present at port "D" ("2"). If no vacuum is present, check for manifold vacuum at hose "C" (or "3"), if vacuum is found in this hose, replace switch. Secure switch using a soft-setting sealant on threads.
  2. For warm engine check (coolant temperature at 120°F or hotter), disconnect hose from port "D" ("2") on EFE/TVS and connect vacuum gauge to port. Start engine, if hoses are connected to proper ports, less than 5 in. Hg vacuum should be present at port "D" ("2"). If more than 5 in. Hg vacuum is noted, replace switch. Secure switch using a soft-setting sealant on threads. DTVS (Engine with Ported Spark) - Disconnect distributor vacuum hose at port "D" of TVS, connect vacuum gauge and check for vacuum with engine idling at normal operating temperature. If more than 5 in. Hg vacuum is present and hoses are connected to proper ports, check using vacuum pump. Replace switch if not to specification.
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