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 about Car Parts & Maintenance
A bad mass air flow sensor in a vehicle makes starting difficult and affects the performance of the engine because he engine-control unit uses data from the MAF sensor to balance the fuel ratio the injectors deliver to the engine. A bad sensor returns a significantly different temperature than that of the engine coolant when read using a scan tool set to temperature.Full Answer >
Putting mothballs in the gas tank does not improve a car's performance. That was not always the case, though. Gasoline used to have such a low octane rating that adding napthalene, which was the active ingredient in old mothballs, did in fact increase the octane rating.Full Answer >
A car's purge valve is a mechanism that directs the vapors emitted by the engine fuel from the fuel tank to the intake manifold. The purge valve also stores the fuel vapors for future combustion, allowing it to be recycled back into the engine combustion process when needed.Full Answer >
The most common symptoms of a bad exhaust gas recirculation valve are rough or misfiring idle, detonation, stalling and hard starting. The EGR valve is a component of an automobile’s exhaust circulation system that reduces pollution-causing emissions.Full Answer >