What is EGR Cleaning?
The main function of the Exhaust Gas Recirculation Valve, or EGR valve as it’s generally known, is to recirculate spent exhaust gas back to an engine’s air intake. The EGR valve is controlled by the vehicle’s central computer and is designed to reduce the amount of NOx emissions in the engine and in turn, the amount of overall pollution the vehicle produces.
The EGR valve helps reduce the combustion temperature, resulting in improved engine performance. However, the valve has a tendency to get clogged due to the unburnt gases that pass through it. A faulty EGR valve can become stuck in an open position, which will further increase the amount of particulates causing the DPF to become clogged quicker than usual. It will also causes a rough idle and a heavy knocking and pinking sound which is associated with pre-detonation.