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EGR valves

 

 

 

  

The EGR Valve (Exhaust Gas Recirculation Valve)  designed to allow the flow of exhaust gases into the combustion chambers.  The valve allows the exhaust gas back when the engine reaches certain operating temperatures.

When the engine first starts or still cold or when idling the valve stays closed. As the engine heats up the valve gradually opens to allow exhaust gases to combine with air and fuel mixture.  The reason the EGR valve does this as nitrogen oxide (NOx) is produced when nitrogen begins to react with oxygen at high temperatures.

The EGR valve helps reduce harmful NOx levels being produced by your car.  Bydoing this it also improves fuel efficiency.

Faulty EGR Valve Symptoms:

The most common reason for an EGR valve to become faulty is carbon accumulation which then can cause clogging. This then can leave the valve stuck open or closed. 
The symptoms from a faulty EGR valve can be similar to some other parts fitted to your car so please read on to understand some of the symptoms relating to EGR valve failure.

If the EGR valve is stuck open it will allow exhaust gasses to flow in to the combustion chamber even at cold temperatures causing engine to idle rough or stall when idling.  Fuel economy will decline along with previously mentioned symptoms and you may notice smell of fuel.

If the EGR valve is stuck closed it will cause NOx levels to rise as temperatures in the combustion chamber will stay high from no recirculation this could then cause MOT failure. You may start to hear sharp knocking sound from the engine.

In our experience cleaning EGR valve can rectify the proble for a couple of weeks but the issue usually returns. In most cases the EGR valve replacement is almost inevitable.

Please contact us if you need a help finding the correct EGR valve for your car.