The EGR Valve.?Here is the scoop on EGR Valves: The Exhaust Gas Recirculation Valve (EGR valve) helps your car more efficiently and completely burn fuel by recirculating a portion of your exhaust and running it through the combustion process again. This results in a cooler, more complete burn of the fuel which decreases you car's noxious emissions by prohibiting the formation of some harmful gases.
The EGR valve controls a small passageway between the intake and exhaust manifolds. When the valve opens, intake vacuum draws exhaust through the valve. This dilutes the incoming air/fuel mixture and has a quenching effect on combustion temperatures which keeps NOX within acceptable limits.
Another component that may be a part of your vehicle's EGR system is a 'ported vacuum switch' (PVS), which may also be called a 'thermal vacuum valve' or 'temperature vacuum valve' (TVS). The switch controls the passage of vacuum that operates the EGR valve.
The PVS screws into the intake manifold, thermostat housing or engine so the heat-sensing element is in contact with the engine's coolant. Inside the switch is a wax plug that pushes a sliding plunger to uncover or block vacuum ports in the switch. As the engine heats up, the wax expands and pushes the plunger up until it uncovers or blocks the vacuum port.
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It is black and made of plastic and is about the size of the bottom of a coffee cup. When removing your engine, make sure to take care not to damage the EGR valve. You can usually tell by your VIN number if you have an EGR valve in your vehicle. When you buy a used or re-manufactured engine you want to make sure you get one with an EGR valve if your original engine had one. Bad things will happen if you get an engine without the EGR valve and you were supposed to have one.