My '91 124 is giving a code 16, which is EGR. I checked the EGR valve. It holds a vacuum and moves. However, I do not get any RPM change when I operate it with vacuum while the car is idling.

I suppose that means the pipe is stopped up.

We have no inspections in my state. If you can roll it into the street, you can drive it.

Does this thing serve any purpose? Do I care that it is not working? Is it worth cleaning it out?

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2012 E350
2006 Callaway SC560