Okay,
EFE is the valve on the exhaust manifold between the manifold and the head pipe. It stays closed when cold sending warm air through the intake for better atomization of fuel.
TVS is a temperature vacuum switch for the EGR if it was equipped with it.
Spark TVS This is a delay for the vacuum advance. When the engine is cold the timing will not be fully advanced.
Both of those switches are in the intake manifold in water passages.
EFE is controlled by a thermal vacuum switch as well.
The other 2 are not for your application.
Roy
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Friday, September 10th, 2021 AT 2:03 PM