EGR (exhaust gas recirculation) the valve has the role of reducing the percentage of nitrogen oxides and hydrocarbons released by internal combustion engines during operation. It can be found in both petrol and diesel engines. It is placed between the intake and exhaust manifold so that it communicates with both manifolds. In certain positions of the accelerator pedal, it can be opened or closed, so that when it is open, part of the gases that have already burned is returned to the intake manifold, mixing with fresh air and burning again in the engine, thus reducing harmful nitrogen oxides and carbon hydrogen released through the exhaust system.
With petrol engines, as a rule, there are much fewer problems with the operation of EGR valves due to the very nature of petrol, which is much "cleaner" compared to diesel.
The problem with diesel engines is due to the deposition of soot, because during recirculation, that part has already burned once and returns to the engine. Due to the poor quality of the fuel (insufficient purification) and its continuous refueling, the problem can occur very quickly, after only a few thousand km.
The most common symptoms of a faulty EGR valve are:
There are several ways to solve the EGR valve problem:
With the correct and high quality EGR off, the engine will work completely correctly without any lights, errors or limp modes. Also, the DPF will continue to perform regeneration at the prescribed intervals. During the technical inspection, it will not be possible to notice the deregistration of the EGR and the vehicle will pass all ECO tests. The intake manifold, turbine, valves ... everything will be much less exposed to soot because there will be no more recirculation so the engine will be much cleaner.
SM chip tuning can provide you with quality and professional EGR off valves at any of our addresses.