EFE valve?!

[GTRS Fiero]

What is it?  Never heard of an EFE valve, but maybe it goes by a different name.

[Fierofool]

Early Fuel Evaporation Valve according to Google.

On start-up, a vacuum motor acts to close a heat valve in the exhaust manifold which causes exhaust gases to enter the intake manifold heat riser passages.

[GTRS Fiero]

So, not the EVRV.

No idea where this EFE valve is on the Fiero, unless it's the valve in the tank on the sender.

[Fierofool]

It was generally used on carburated engines.

[GTRS Fiero]

Of course, I discovered the EFE valve in the FSM.

[Fierofool]

Come to think of it, there was something on the 4 cylinders that worked similarly.  There was a shield around the exhaust pipe that had a hose that ran up to the intake snorkel or breather neck.  I think it might have been called a Thermac.  I still have part of an exhaust system with that shield on the pipe.  It helped to keep the carb or throttle body from icing before the whole engine warmed up.