Chevrolet 12660270 Valve Assembly, Egr

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Oxides of nitrogen, or NOx, are compounds formed in combustion chambers when oxygen and nitrogen mix together. They are a natural byproduct of high combustion chamber temperatures. When emitted from the tailpipe, NOx combines with reactive organic compounds and sunlight to form ozone and photochemical smog. The EGR system helps reduce NOx emissions by recirculating exhaust gases back into the combustion chambers, which cools the chambers and reduces NOx. The system consists of the PCM, EGR valve, and various sensors. The EGR valve is controlled by the PCM and uses a position feedback circuit to control the position of the pintle valve. If there is too much or too little EGR flow, it can cause engine issues. When replacing the EGR valve or pipe, it is important to disconnect the electrical connector, remove the mounting bolts, and discard the old gasket. Installation should be done in reverse, using a new gasket and tightening the bolts securely.