Well took the intake manifold off for cleaning. While I have it off going to adjust the valves, clean and paint the valve cover, and replace some hard to reach hoses. My waste gate is water cooled so this is probably a good time to consider plumbing for that.
I color coded my vacuum schematics so I know what is going and what is staying. Yellow is fuel system, and is colored just for clarity. Green is staying and red is eliminated. Should make life and troubleshooting easier.
Of all the weird stuff to slow me down. I didn’t think the valve cover would be an issue, but here I am. The valve cover is made up of two pieces of steel one inside the other with a very narrow gap between them. The inside piece acts like an oil seperator and splash guard with several holes along its lower edge for oil to drip back down. The narrow passage feeds the pcv and main crank ventilation tubes, or should. Problem is the passages are all clogged up with soot and carbon. My 3fe probably hasn’t had pcv working for years.
Also an issue if EGR gets plugged or otherwise doesn't breath well.
Side note, on an early EFI Z car I lost a few MPG when I tried defeating the EGR but just 'knew' I was getting more power. EGR valve seat later clogged and started sticking open which caused poor idle and lean running... lol. So I went full circle, put all the smog stuff back on and the car started running better. Sometimes the Japanese knew what they were doing.