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The main emissions of a car engine are: 1  Nitrogen gas (N2) - Air is 78-percent nitrogen gas, and most of this passes right through the car engine. 2  Carbon dioxide (CO2) - This is one product of combustion. 3  Water vapor (H2O) - This is another product of combustion.
The EGR valve is vital to your car's emission controls. Exhaust gas recirculation helps to keep huge amounts of unburned fuel from being released into the atmosphere. This unburned fuel is thought to be a huge contributor to greenhouse gas build-up.