Not sure where the PCV is, but if someone gives me some guidance, I can check it. When I blew air into the dipstick to find the source of oil loss, I had to plug the hose that came out of the back corner of valve cover and into the air intake, otherwise I could not get any pressure into the engine. Is that what you mean?
The PCV is buried under the intake.
PCV Valve replacement
2006 Mazda 3 2.3L Hatchback 5-speed Automatic - 180K miles
I never purchase Harbor Freight tools.