Constant Vacuum Control (CVC) Valve
Start engine. Verify presence of manifold vacuum to CVC valve. Disconnect CVC vacuum hose at EGR solenoid. Connect vacuum gauge. If vacuum reading is not about 8 in. Hg, replace CVC valve.
Start engine. Verify presence of manifold vacuum to CVC valve. Disconnect CVC vacuum hose at EGR solenoid. Connect vacuum gauge. If vacuum reading is not about 8 in. Hg, replace CVC valve.