To understand why this is important, you first need some background on car exhaust systems. The basic function of the EGR valve is to redirect exhaust back into the intake manifold. Check your car’s manual to identify what your vehicle uses before you attempt any repairs or order any new parts. There are a half-dozen or so different popular configurations for modern EGR valves. In some cases, this means eliminating the EGR valve completely, replacing it with a digital valve. They may also use a purely electronic EGR control, though. Newer vehicles may use a hybrid system that incorporates electronic components into this vacuum control. If you have an older car, it may have a purely vacuum-controlled EGR valve. The original EGR valve used a vacuum for the control. The design has changed quite a bit over the years, of course, increasing the sophistication and control of the valve. You’ll find controllable EGR valves on engines dating back to the early 1970s.

It’s one of the oldest emission reduction techniques for combustion engines. You can find EGR valves on both gasoline and diesel engines. The size and placement of the EGR valve make it easy to identify when you open the hood, though it may be underneath another component. These valves are between 4 and 6 inches tall, topped with a round metal disc about 3 inches across. The basic form of all EGR valves is similar.

The EGR valve is a crucial component of most car exhaust systems.ĮGR stands for “exhaust gas recirculation.” The exact design can vary between manufacturers.

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