Easy Reversible EGR delete, 95,96,97 Non-Turbos - Page 3 - PeachParts Mercedes-Benz Forum

Racekar · #1 04-12-2008, 04:24 PM

I don't want to start a war about the ethics of this, I am just presenting what I have learned, if others want to try.

Sometimes it seem like these cars are forgoten about with most working on the W123's and early turbo W124's. But our engine seems particulary venerable to soot and crud blocking the intake manifold. Also non-turbos do not have as much HP and any performance benefit is welcome.

There are 3 parts to our EGR system.
1. The EGR valve it self and it's attachment to the intake
2. This model has a baffle in the intake, This baffle moves by vacume linkages to draw fresh air from the air box or exhaust gasses from the EGR (or a combination of the two)
3. There is a mechanical linkage that attaches from this baffle to the throtle linkage and helps hold the valve open under wide open throtle.

So what do we want, the EGR to remain closed. If we just plug the vacume line to the EGR it will not open, but because of the baffle we will still try and draw air from it, restricting airflow and hurting power.

I have worked out a way to make it all work, and it can be changed back in 5 minutes if you need to get an inspection

First block the EGR vacume line (the line going into the top of the EGR valve) with what ever fits. I used a bolt with the head cut off and shoved it into the line and then reconnected it to the EGR so it looks stock.

Next disconnect the rail that connects the baffle and the throtle, in a moment you will see why.

Next pop off the vacume regulator connection to the baffle, it will just sit there and move during operation but not affect the baffle.

Now I used some safety wire and fixed the baffle in the fully open position. Since the EGR will not open and the other mechanical methods of baffle movement are removed the engine always gets fresh air from the airbox.

I have included some pictures. I have noticed that the car has more pep under part throtle operation and does not have to downshift as often to accelerate or mantain speed on grades. I think it will make more difference once I remove my manifold and clean out all the crud that has built up. I think this may also work for the 98-99 turbo models but it may throw an error code because your engines have more electronic feedback.