RE: EGR Replacement 1998 ML320
When I cleaned mine I found it very difficult to pull the long tube out of the intake manifold because of the bends. Then when I removed the rubber vacuum block immediately next to the tube, I found that the rubber had deteriorated and the center syphon tube had broken off. Removing that block was the only way I could gain clearance and the right angle to get the EGR tube out.
The end of the EGR tube was totally coked closed with carbon. I am not sure how this can even happen.
I live in the rubber testing center of the USA and your mileage may vary. The part # of the vacuum distributor is 112-018-02-09, dealer price $9.25. You can reuse the EGR metal gasket but you may want to have this piece in hand.
Jim in Phoenix