3.0 LITER TURBO. By-pass valve. A manifold vacuum actuated Valve designed to release pressure in the intake system of a turbocharged engine when the throttle is lifted or closed. Turbocharger Intercooler Bypass Valve. Non RETU. BY - Passenger Control. Charge Air Cooler Coolant Diverter. THROTTLE Body. Turbocharger Intercooler Bypass.