Constant Vacuum Control (CVC)
WARNING: This page is about a different car, the 1992 Acura Legend. However, it is still accessible from the selected car via links, so may be relevant.
Start engine. Verify manifold vacuum is present at CVC valve located inside control box on firewall. See Figure . Disconnect CVC vacuum hose at EGR cut-off solenoid. Connect vacuum gauge. If vacuum is not about 8 in. Hg, replace CVC valve.