QUOTE(dax1969 @ Apr 28 2021, 01:06 AM)
Found that thread earlier and was excited to see a solution .... got worried and backed out when DRPHIL914 jumped in and created a leak ...
Do you still run the Toyota PCV valve with no issues ? Idle ok, no leaks ?
thks yr feedback
Dax
Yep. I still run it without any problems. I did swap the electrical tape for some heat shrink tubing as was suggested by bob164. Looking at that thread again, it seems that DRPHIL's issue was that his '75 didn't have a return line to the crankcase through an anti-flashback valve. So plumbing the breather box to the plenum instead of the air filter depressurized the crankcase and caused...something...to leak.
At this point, I can say that the Corolla PCV valve seems to work really well in a '73 2.0, with the rest of the system plumbed like Bowlsby's diagram. If you have some other engine, or some other model year, or some other hose routing, you may have issues.
If you currently have a hose running from the breather box to the air filter box, you can't just splice in a PCV valve and run the hose to the plenum instead. You need the whole system per Bowlsby.
Cheers.