Aftermarket & OEM EGR Control Valve
A faulty vacuum control valve will not allow for a smooth idling engine along with a hesitation when the operator decides to accelerate the vehicle. This occurs because of the delay in the butterfly valve in the intake opening that makes it possible for the air and on older vehicles air and fuel mixture to move more rapidly towards the combustion chamber. The cause of the vacuum control valve failing can be from a vacuum leak with a broken line, the diaphragm in the valve body or a vacuum leak in the system on the engine that can occur at a gasket or vacuum line becoming loose.
A faulty Vacuum Control Valve will cause your emission control system to malfunction causing the performance of your vehicle to never be able to reach an optimum level. This is the most likely place for this type of controlling mechanism to be on your vehicle. Another name for it is EGR valve solenoid. The Vacuum Control Valve can become non-functional when the polymer diaphragm in its interior becomes cracked and can no longer hold the suction of the vacuum the engine requires from it or a plunger with polymer seals. With this device not functioning properly, the fuel in the exhaust gases will no longer be able to enter the combustion chamber and warm the new air and fuel mixture to help reduced the amount of pollutants the vehicle burns along with reducing the performance level of the engine. Your engine check light will also become illuminated.
The location of the vacuum control valve is on top of the engine on the intake. It can be controlled by a vacuum line or by electronic means in which the onboard computer regulates the opening and closing of the butterfly valves. The vacuum control valve is on the exterior of the intake but connected to the butterfly vales on the interior of the intake by a lever that is connected to both components. Valves that are controlled by vacuum have a polymer diaphragm in them while electronic versions had a solenoid that moves the lever back and forth.
The Vacuum Control Valve is a polymer and metal component that is attached to the engine block. Not only are vacuum hoses attached to it but also electrical wires so it can receive and send a signal from the onboard computer when the engine is being operated. Each manufacturer and model of vehicle has a different Vacuum Control Valve located in its system and they are not interchangeable with another type of vehicle.
To replace a damaged or non-functioning Vacuum Control Valve is most easily accomplished by looking at the emission control diagram on the decal in the engine compartment of your vehicle or a service manual for the vehicle. Another way is to trace the vacuum line from the engine block to the faulty Vacuum Control Valve. Once located, it has to be removed and the new one put into place. Before this procedure is carried out, the battery must be disconnected. This will clear the code in your onboard computer so the new valve can be tested once the repair procedure is completed.
The replacement procedure for the vacuum control valve requires that the battery be disconnected if the vehicle has an electronically controlled valve. The valve should then be disconnected from either the vacuum system with the line being taken off or the electrical plug being disconnected. Then the lever connecting the vacuum control valve to the butterfly valves in the interior of the intake removed. The technician can them remove the mounting bolts and replace the valve.