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EGR valves control the amount of oxygen that enters the combustion process in an engine. If there is too much oxygen and the fuel level is reduced to an economical level, the combustion temperatures become so high that pistons and exhaust valves burn and/or melt, and exhaust manifolds will literally glow red. By carefully controlling the amount of oxygen in the mixture, engineers have discovered a way to reduce the fuel consumption while maintaining an acceptable power level. EGR is an acronym for "Exhaust Gas Recycling", which means that a controlled percentage of combustion gas is allowed back into the engine to lower the percentage of oxygen. A faulty EGR valve can cause too much of the exhaust gas into the engine or worse, not enough. If it's not enough, your engine can literally burn itself to the point that it is useless. It's important to keep your EGR valve operating properly. Placement of the EGR valve is different on the different engine configurations. You'll need to take a look at the replacment EGR valve and look around for yours, or even ask the sales clerk.

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Q: What is erg valve on 2001 ford escape?
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