GM 12581985 Valve,Evap Emission Canister Purge

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As already indicated, the EGA system is only viable for 2004 and later models that have the V6 engine. Sulphur dioxide and oxides of nitrogen (NOx) are produced in combustion chamber due to reaction of oxygen and nitrogen in the incoming air at high temperature of combustion. NOx emitted from the tailpipe of vehicles reacts with reactive organic compounds and hydrocarbons together with sunlight to form ozone and photochemical smog. Reduces NOx emissions through EGR system which forces back the gases from exhaust manifold through EGR valve and into the intake manifold to the combustion chambers and mix with air/fuel mixture to cool the combustion. The EGR system is made up of the Powertrain Control Module, the EGR valve, the EGR valve position sensor, other sensors that will let the PCM know when to open the EGR valve. The amount by which the EGR valve opens is referred to as the EGR valve lift and is controlled by the PCM which varies the current supplied to the EGR valve in response to working parameters. If it is unsuitable for the conditions, the PCM shuts current down to close the valve of EGR flow. In the case of EGR valve removal, disconnect the wiring harness by pulling the release tab and removing the electrical connector, then, two mounting nuts are removed. Upon pulling the valve, the two gasket surfaces must be cleaned to make sure no remnants of the previous gasket is left. The installation process is done in a reverse order which requires a new gasket and proper tightening of the mounting nuts.