An EGR valve helps to improve the performance and economy of a vehicle while reducing emissions by directing exhaust gases back into the cylinders of the vehicle for a second burn. The valve reduces nitrous oxide emissions and directs the warmer exhaust back into the engine, reducing the amount of work required by the fuel-and-air mix in maintaining the engine at operating temperature.Know More
The first EGR valves were simple orifices that directed exhaust gas back into the engine. They resulted in several problems, including difficulty starting, poor fuel economy, rough idle and poor performance. Manufacturers redesigned the EGR valve to use the manifold vacuum to keep the valve closed when starting the engine and open it once the engine reached a certain temperature. Although most engines continue to use the EGR valve to meet 2014 emission standards, some manufacturers are finding options that eliminate the valve while still meeting the requirements.
A dirty EGR valve in an engine affects its performance. Many are easy to clean by soaking in carburetor-cleaning fluid. A vehicle owner who attempts this fix should ensure he does not expose electrical connections to the cleaner. Once the device is cleaned and reinstalled, there is usually a noticeable difference in the performance of the engine.Learn More
Replace the PVC valve on a vehicle by locating the valve and pulling it out with needle nose pliers. Put in the new valve by attaching it to the hose and snapping it into place.Full Answer >
A car's electronic control module is the computer responsible for providing fuel to the engine and controlling the quality of the car's emissions. The ECM uses a microprocessor and software to analyze and respond to the input values from an array of sensors. An ECM is typically part of a larger system, with multiple modules that control everything from power steering to airbags, commonly called the car's computer.Full Answer >
The purpose of the intake manifold, or inlet manifold, is to evenly distribute the air-fuel mixture to the cylinders as well as to the carburetor on a non-fuel-injected engine. An intake manifold is the opposite of an exhaust manifold, which collects gases from the cylinders.Full Answer >
The most common causes of insufficient EGR flow are carbon build up in the EGR valve and a malfunctioning EGR valve. The EGR valve, or the exhaust gas recirculation valve, reroutes exhaust gas back into the intake manifold where it is drawn into the engine cylinders. Without proper EGR flow, a car will not pass an emissions test because insufficient flow causes a high saturation of noxious gas.Full Answer >