Yesterday while changing the oil in my 1999 E300 I noticed what I think is soot being blown out of the EGR housing. Some of is splattered and dried, and some of it is kind of oily. It appears to be coming from the bottom of the EGR housing where the charge air pipe (from the intercooler) meets it.
A few months ago I had all of this apart when I changed the glow plugs, and I did replace the rubber o-ring where the charge air pipe meets the EGR housing, and I thoroughly cleaned the carbon out of the intake manifold and egr housing, so I don't think there's any blockage. It's been fine until now. It is possible, I suppose, that that connection has come loose, and is allowing the hot air mixed with soot, to come through a leak in the connection.
Does anyone know if the EGR can somehow go bad, or maybe get clogged? It doesn't appear to be a very complicated device.
I don't relish the thought of taking the intake manifold off again, but it looks like I might need to. :confused: