They tend to include cleaning additives that keep those sooty carbon build-ups to a minimum. The EGR valve is controlled by your engine management system.
It connects into your exhaust system via a metal tube, feeding the exhaust gases back in through the inlet manifold. The valve is driven by a solenoid on the EGR unit or by a solenoid on the vacuum circuit. Some EGR units include a cooler that lowers the temperature of the gasses before being sent back into the combustion system. The EGR cooling unit is plumbed into the engine cooling system.
For those who have a good understanding into the workings of their car, and have confidently carried out a wide range of repairs already, we think this is one of the tasks that should be within their scope, and hopefully, only take a couple of hours. Your browser does not support iFrames. Skip to content. Enter your details to see exact price Your postcode. Your registration number. This page is for personal, non-commercial use.
With society being much more conscious about the environment and leaving as little footprint as possible, the exhaust gas recirculation EGR valve is more important than ever before. This little valve is responsible for single-handily bringing down the amount of exhaust emissions your car expels from the tailpipe into the atmosphere.
The valve makes it possible to recirculate the engine gasses by putting them back into the intake manifold. At this point the engine burns them again, so there are no emissions to worry about. Typically if your vehicle has been made in the last two decades, it is outfitted with an EGR valve. While there is no set mileage that it should be replaced, it is important to check that it is in good working order.
It is suggested that every 50, miles you have a carbon cleaning done, which is an air induction. This will clean out any carbons and sludge that is building in the air intake system and the engine. You may start to notice a sudden loss of power. This can be quite dangerous if you are in the middle of driving. If the valve is stuck, it can result in the car not running smoothly.
It may feel as though it is about to stall, it can stumble, and even shake. If you have tried to pass an emissions test recently, only to have your vehicle fail, that can be due to a faulty EGR valve. Once it is replaced, you should be able to pass the test. Your Check Engine Light may come on since the engine is not operating as it should. Therefore, incorporating EGR systems into the design of a car is important with regards to lowering harmful emissions to save the environment and have a positive impact on human health.
The majority of modern vehicles incorporate EGR valves into their design to reduce NOx emissions and therefore meet stringent emissions regulations. EGR systems recycle a portion of the exhaust gas back into the combustion chamber, where it combines with fresh intake air. This lowers the amount of Oxygen and increases the water vapour content to the combustion mixture which reduces the peak combustion temperature.
Because more NOx is created as peak combustion temperature rises, the EGR valve effectively reduces the amount of NOx produced by the engine. The EGR valve begins working once the engine has started, attained the correct operating temperature and the vehicle's speed increases. Gradually, the EGR valve regulates the flow of exhaust gases. Once the vehicle slows down and the engine stops, the EGR valve will return to its closed position and prevent the flow of exhaust gases.
A frequent problem with the EGR valve is sticking due to a build up of carbon deposits. In worst cases, the EGR valve and EGR passages can be completely blocked, preventing the process of recirculating the exhaust gases. Clogged EGRs are often the cause of black smoke escaping the exhaust, in addition to increased fuel consumption or reduced performance.
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