How do you test the egr valve?

Answer 1

The question is,"How do you check an Exhaust Gas Recirculation Valve?" What I would do first (And am currently doing on a 1993 Ford Taurus 3 litre V-6)is pull the vacuum tube from the EGR valve, blip the throttle or have someone place the car in gear and accelerate LIGHTLY WITH FOOT FIRMLY ON BRAKE AND PARKING BRAKE APPLIED and see if you can feel vacuum pull in the tube. If no, like the Taurus, the EGR control valve or motor, which is usually electric, may be defective. Another step would be to connect a length of vacuum hose to the disconnected EGR valve, then have that someone accelerate like before, but this time, and for lack of a better word, suck lightly on the hose; the engine should start to run slightly roughly or the pinging will stop...or, if the diaphragm is defective you will not be able to pull vacuum; that is, it will be like sucking air through a straw. Third, if the EGR valve is stuck, you will have vacuum when you pull on the hose, but nothing happens with the engine. Hope this has helped. Kevin NC