Exhaust back pressure is the phenomenon that involves a significant drop in the pressure coming from the engine. Any liquid fuel that is made to pass through a pipe leaves drag on the walls of the pipe. The thickness of the drag depends on many factors, including the viscosity of the liquid, the smoothness of the pipe interior, the diameter of the pipe, but any drag results in reduced pressure passing through the pipe. The pressure drop takes place throughout the pipe, which means that the pressure that enters at one end of the pipe is lower than the pressure that leaves at the other end – the effect called back pressure.
Back pressure is harmful for the engine and it is a problem that needs to be remedied as soon as possible. The symptoms of exhaust back pressure include reduced engine power, poor fuel economy, slipping transmission in the case of automatic cars, altered shift points, among others. In very severe cases, the problem can seriously compromise the car’s driveability by making the EGR valve recycle too much gas or might even cause the engine to stop running completely. If you notice any of these problems, take the car to your mechanic who specializes in exhaust such as http://www.budsmuffler.com/catalytic-converters/ right away – the signs of the fault might be scary, but the problem can be remedied relatively easily.
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