On my M103 I disabled the EGR, I removed all vacuum lines to it.
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Well, that's kind of where I'm at now. However, in theory, properly running EGR will reduce combustion temperatures and possibly save a bit of fuel by reducing the effective displacement of the engine under certain conditions.....
The fact that it reduces some forms of pollution is a good thing too, I suppose......
Anyhow, I wouldn't mind having it working if inexpensive enough. If I ever go back to Illinois, I'll have to!