With the engine running. Use a hand held vacum pump (MIghty Vac) to apply vacum to the EGR valve, (about 10 inches of vacum should be sufficient) with the engine running. The engine should run rough or die with vacum applied. This checks the valve diaphragm. And the EGR ports. If the valve doesn't hold vacum the the EGR valve needs to be replaced.
To check the solenoid, you can plug a vaum guage into the hose comiing from the solenoid to the EGR valve rev up the motor (a road test while having someone monitor the vacum guage may be neccessary to see if the solenoid is opening. About 4 to 8 inches of vacum should be seen.
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Monday, June 29th, 2009 AT 8:54 PM