Where Is the Egr Valve on a 2003 Jeep Liberty

What Does an EGR Valve Do?

by Paul Novak

the powerful railway locomotive image by kuhar from <a href='http://www.fotolia.com'>Fotolia.com</a>

In the early 1970s, automobile manufacturers began equipping their vehicles with EGR (exhaust gas recirculation) valves to repress the levels of pollutants created by their vehicles. At highschool temperatures, oxygen and nitrogen combine to form N oxide, which is considered one of the main components of smog. EGR valves help to reduce the amount of nitrogen oxide produced by automobile engines by lowering the temperature of the combustion process in an engine.

Basics

Nitrogen oxide is a noxious gas and is matchless of the main components found in smog. It is produced during the combustion process in an automobile when temperatures in the combustion chamber exceed 2,500 degrees.The EGR valve industrial plant to lower berth the combustion temperatures in an railway locomotive away introducing a controlled amount of evacuate gases into the engine cylinders. These evacuate gases cannot be destroyed again and merge with the fire and air mixture that enters into a cylinder, which chemically lowers the temperature at which the fire and air mixture burns, reducing the production of N oxides.

Operation

The EGR valve has an recess tube that is connected to the engine's exhaust system and an outlet tube that is connected to the uptake manifold. The main body of the unit contains a valve which opens under destined conditions to allow a certain amount of wipe out gas into the intake manifold, where it then mixes with the fuel and air mixture and cools the combustion action.

Vacuum Control

EGR valves on older vehicles manufactured earlier 1981 are operated according to the amount of vacuum created by the locomotive under different operational conditions. These units have a vacuum hose pledged to them which connects to the intake manifold paper and provides the ported vacuum cleaner necessary to operate the valve. As the throttle is opened more vacuum is created, which causes the valve to open and introduce exhaust gases into the ingestion manifold. These early EGR systems as wel used a thermic switch which prevented the vacuum from operative the EGR valve until the engine reached normal in operation temperature.

Electronic Control

Newer vehicles factory-made after 1981 use vacuum and electronic signals to control the operation of the EGR valve. The EGR valve is joined to a vacuum source from the engine and also has one or more wires conjunctive it to the vehicle's data processor. The computer uses sensors to monitor the operation of the engine and sends signals to solenoids within the EGR valve to more precisely control the valve's surgery than vacuum operation alone tooshie. This allows the EGR valve to operate so much much expeditiously and further reduce the production of nitrogen oxides.

EGR Unsuccessful person

When EGR valves fail, the system is unable to properly introduce exhaust gases into the fuel and air mixture, which causes the temperature within the combustion chambers to increase. This temperature gain can cause pre-ignition, knocking and pinging, and over-yield of nitrogen oxide. To prevent this, modern vehicles use computer controls which note when the EGR valve is no longer adding exhaust gases to the fuel and air mixtures. The computer and so reduces the amount of ignition pull ahead, which in turn slows down the combustion process, but at the cost of reducing carrying into action and fire mileage. When the EGR valve fails, a cipher is set in the vehicle's computer, which causes the crack engine fire up to come on. This inscribe also allows automobile technicians to quickly determine the cause of the job.

References

Writer Bio

Paul Novak is a freelance writer specializing in Web content creation. He has owned his have byplay for seven geezerhood, and has for 10 years written along a kind of subjects from political science to the telegnostic. His articles critical of paranormal claims receive appeared in "Xproject" cartridge holder and "Ufoevidence."

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Where Is the Egr Valve on a 2003 Jeep Liberty

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