I can't seem to find that switch over valve anywhere. I cleaned out the banjo at the manifold and the lines, (they were dirty). Cleaned the lines from the "thingY' at the IP with the vac lines all going to it and other banjo ,(Could this be the alda?), with the green filter looking thing next to it. ANyhow thats all the vac lines I could trace... There is one in by the firewall but that goes into the cab and thats it.. No switch with vac lines mounted on the firewall. I have an 83' 300SD california emissions , says the window sticker....

Any help is appreciated. I guess I may not have that firewall mounted switch? (possible?)

ALso, is the ERG valve that metal looking thing in front of the engine closer to the turbine area with a brown vac line going into the top of it?

Cheers!