Exhaust Gas Recirculation: Description and Operation
DESCRIPTIONThe Exhaust Gas Recirculation (EGR) system is designed to lower Oxides of Nitrogen (NOx) emission levels created by high combustion temperatures.
OPERATION
The EGR valve will open when conditions of operation have been met. The valve will open and allow exhaust gasses to re-enter the combustion chamber. When too much exhaust gas is allowed to enter the chamber, proper combustion will not occur. For this reason only very little exhaust gas is allowed to re-enter the combustion chamber.
Figure 9-1 - Linear EGR Valve Identification Markings:
EGR VALVE IDENTIFICATION
- Linear EGR valves look like a small motor. Refer to Figure.