Advise blocking not only the vacuum line but the EGR-intake manifold connection as well, thus completely disabling EGR. After having long since blocked the vacuum line to the EGR valve on mine, I finally got around to fashioning a functional if not perfect plate and sandwiched it between the EGR valve gasket and intake manifold...

Quotes from the MercedesList to possibly justify further action::

"On mine, the coupling hose on the air line to my EGR somehow got a BB stuck in it. Perhaps this weekend, the gasket between EGR and intake manifold may somehow be covered by a flat sheet of metal."

"You know how the vacuum connection on the EGR valve can get clogged up by a BB? Well, you would think that this would render the EGR inoperable, right? Wrong -- at least on a 603. When I opened up my intake area where the EGR "exhausts" the exhaust back into the intake, there was a nice "curved" trail of oil from the EGR's output, and fresh at that. I'm assuming that the curved path is indicative of the air swirl as a result of boost. Given this trail of fresh EGR output, it appears that further steps may be needed besides the "BB" fix."

Both experiences from seasoned diesel-heads...good enough for me...



-Ken
1984 300SD