So let me get this straight...
The 2/3 valves which connect on the top of the valve cover have three lines. The lines are vacuum, vent (open to atmosphere) and vacuum to the EGR, right?
The 2/3 "switchover" valves take constant engine vacuum, and either allow it to be presented to the thermo valve and ultimately the EGR for actuation, or else force it to vent to the atmosphere by a leak.
Now, I can understand the route for vacuum via this diagram, on post 31:
EGR Delete/Remove
I can see that vacuum comes in and goes to the EGR, but just to be sure Im accurate, there is also an "atmospheric" vent line which connects to other vents via some lines connected to the IP? So the IP gets some vacuum and has a line which is open to the atmosphere?
It seems that all "vent" lines share a common open to the atmosphere final line. Is that correct?
Thanks!