What Is an EGR in a Mazda 626?

An EGR helps keep smog emissions down.

An exhaust gas recirculation system is a very important automobile component. It plays a large role in keeping each automobile's emissions from polluting the atmosphere to a large extent.

Function

The primary function of an EGR system in a Mazda 626 is the same as it is in any car -- to reduce nitrous oxide emissions. When the combustion chamber in a car's engine gets too hot, nitrous oxide can form. The EGR system prevents this by recirculating exhaust into the intake stream to cool down the combustion process.

Significance

When nitrous oxide is formed in a car's combustion chamber and released, it can combine with hydrocarbons to form smog. The exhaust gas recirculation system is a means of reducing nitrous oxide production and thereby reducing the harmful emissions of your Mazda 626 or any other automobile.

Considerations

In considering an exhaust gas recirculation system in a Mazda 626, there are a few things you should take into account. The EGR system must control the flow of recirculated exhaust very precisely. This is partly to maintain national standards and partly because the performance of the EGR system will affect the car's performance as a whole. Too much flow may cause a lull in acceleration, and too little flow may cause engine ping.

References

• AutoInc.: Understanding Exhaust Gas Recirculation Systems