How do you change the egr valve on a 1994 merc grand marquis and are there any moving parts in an egr valve?

Answer 1

My first suggestion is go to a mechanic and have them do that work. That's what I will end up doing, but if you want to try it, here are the steps: I have a 1993 Grand Marquis, and the EGR valve is located in the center back of the engine. In order to change it, you first have the jack the car up, and undo the EGR tube for the base of the engine. Then lower the car back, undo the EGR solenoid (one 8mm bolt holds it on, and then its hooked on a bracket, turn it ninety degrees to remove it). Unplug the electrical connector, and pull off the two hoses at the bottom. This will expose the top of the EGR valve. Pull off the one hose that is connected to the top of the EGR valve. Now the tricky part. The EGR valve is bolted on with two bolts, and the nuts (10mm) are extremely difficult to get too. This is why I will have a mechanic do it. I don't have the right tools to get into the small places where the nuts are, and I can't get enough torque on the wrench (because of the tight conditions in the engire) to get the nuts to turn. You might have better luck. The nuts are located against the engine manifold. You'll be able to feel them with your fingers if you reach and feel around (can't really see them, due to the location in the engine). Its alittle easier to move around in there, if you disconnect some hoses and wires. Again, I got defeated at this part, but if you can sucessfully get the nuts off, the EGR valve will come right out. Take off the EGR tube at the bottom, connect it to the new EGR valve, and put it back onto the engine. Reconnect everything and put the solenoid back on. Jack the car back up, reconnect the EGR tube to the engine, and you are all set.