El Camino Central Forum banner

exhaust efe valve

  1. the Real Scoop on exhaust manifold EFE Valve, please?

    Engine Topics
    I've heard it both ways on this forum, so now I need to know for sure how this works. With no vacuum applied, is the EFE valve open, or closed? My '82 Elky has vacuum in that circuit when the engine is running, even fully warmed up. So from that I would like to assume that the valve is open...
Top