Found out what the green & yellow plastic valve is a
Air Inject Check Valve

How would it being disconnected affect the engine?

I better get it a new vac hose as its really bad
had to cut the one end straighte agsin as it was all cracked & broken.

Also found reference to a T vac connector to warm up regulator
I have no such.

The Air ICV igoes into the intake man
but is also connected to a 4 way & where they do is not clear

Thanks

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83 500 SEC Euro 198K