CEL - 16 blinks - '93 M103

[d.delano]

I got a CEL with 16 blink code from a 1993 190E 2.6 160k mi

Referring to the code list, it cites Exhaust Gas Recirc

The EGR is right there on the exhaust manifold, so I hooked a MityVac up to it and it doesn't hold vacuum. Am I testing it correctly?

I assume this needs to be replaced. I believe it to be the original. Looks like the original at least. However, I've read that the tube needs to be cleaned out as well, and have also read varying reports of how this is to be done. Some say you can do it with some sort of cleanout 'snake' like a speedo cable or whatnot, others say I have to remove the intake and replace the tube.

I've been driving the car like this for a couple of months. Runs fine as far as I can tell. Obviously I'm going to have to get at it and get it fixed. What tips can anyone offer, and what kind of damage am I doing continuing to drive the car like this? Thanks