My wife's 1981 300SD's EGR valve has finally died. The diaphragm has failed. The price of a new EGR valve is just short of shocking and used ones will most likely be no better than what I now have on the car.

I've had a few folks advocate just plugging the line going to the EGR valve with a BB and be done with it.

I know the EGR on a Diesel doesn't affect the engine performance, but the EGR is supposed to reduce the oxides of Nitrogen which contributes to smog.

Any thoughts? Replace the EGR valve or plug the line going to the EGR valve?

Thanks. Tom

 

I have to agree with Forcedinjection. The egr reburning the gases does lower the nox per gallon/liter but it does mutiply the co and others. The less fuel you burn = less emmissions. Most of this tests are not going to make the enviroment better, but make jobs and force people to spend money to help the econemy. goverment at their best

 

I pulled my Intake Manifold off to day and found the below that I Posted on another Forum.

 

Can any body give a tutorial on how to appropriately delete egr from an 83 300SD? I see a diagram of how to do it for an '85, but they have an electronic switch in place of the Vacuum control shift levers....

I just want to be sure I'm pluggin the appropriate lines, and leavin g the right ones connected etc.

Thanks.

Image below
1985 300SD


Image below
1981-4 300SD EGR Vac Diagram

 

Surfsup,

I used two BBs to plug the white (clear) and black lines going to the central plug, item 71, in your lower diagram. I put the BBs in the leg of the "tees" that these two lines are connected to. Use a small screwdriver and poke them down about 3/4". Don't poke them too far or you will mess up the "tee". Then insert the lines again into their respective "tees". Outwardly, it looks like everything is still connected and you could one day re-connect everything if you wanted to do so.

 

Awsesome thanks for the clarification!

 

Even with the lines pluged the EGR may still be putting some gases into the motor. To insure I had mine pluged I unbolted the EGR from the intake and made a solid gasket/ no hole for gases to get through. As my lines were pluged but I still was getting exhaust into the intake. This fixed it for sure

 

Would you happen to have a picture of how you deleted your egr? Thanks.

 

Pull EGR off, make 2 block off plates, 1 for intake manifold and 1 for exhaust manifold. Bolt those on in place of the EGR and cap off any lines. Done.