EGR Valve

The EGR Valve is a vital component to the vehicle as it controls the flow of the exhaust gases. This device restricts the exhaust gases from returning into the combustion chamber. At first the EGR was very unpolished and needed work as soon as possible, since it was causing rough starting and poor engine performance. Now many modern cars are in need of the EGR to pass certain emission standards, but recent inventions have led to engines that no longer require them.

EGR function

The EGR was made to recirculate a bit of the exhaust gas back into the engine cylinders. Exhaust gas is pushed into the intake air stream to lower the temperature in the combustion while also reducing the nitrogen oxide emissions. Also, in a modern vehicle engine a 5% to 15% of exhaust gas is recirculated to the intake.

Too much recirculation over time can cause the EGR system to get clogged up with the carbon and can make the system stop functioning. But a proper functioning EGR can increase the engines efficiency through reduced heat injection and throttling losses.

Common issues with a bad EGR valve

A faulty EGR valve can lead to carbon buildup, engine performance will decline, and the vehicle will have a rough idle.