Thats how you test the egr valve is by pulling a vacuum on the diaphram of the valve to see if it holds. The diapharm is the most common reason those egrs fail. They might rent one at auto zone. Its a must have in your tool box if your going to fix cars. If you buy one get the mighty vac brand one.I would pull a 20 inch pound vacuum on the valve and see if it holds.
Wednesday, April 4th, 2012 AT 4:55 PM