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Start at the exhaust. Look for a pipe that goes to the intake. There will be a valve with a vaccuum tube, this is the EGR valve The EGR valve returns exhaust to reduce N.O. At idle it is closed, at 55 rpm it opens. You can test the part to see if it holds a vaccuum, otherwise that's about all it does. Most of the newer cars will also have a solenoid switch. Now this switch must be tested for ohms and if open will cause problems at smog test. A bad solenoid will cause a "fail"
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