Positive crankcase ventilation

72Duster440 said

So cater to my dumb butt here, but what symptoms would I see if it wasn’t operating properly?

Click to expand...

I have never in my life had one inop from a low vacuum signal......and I've had some pretty low vacuum engines. The slant 6 I have now idles with only 6hg. It doesn't even have enough to pull in any vacuum advance at idle, hooked to manifold vacuum. lol

That said, all I've ever seen were inop from being stopped up and stuck, broken spring and all "that". I've heard some make noises like buzzing and such, but they still worked fine. Symptoms from a failed PCV valve can be excess blowby, excessive oil smoke out the exhaust, I've even seen a few puke oil from seals and such from too much blowby and crankcase pressure. Failed PCV valves can make an engine just messy and oil as heck on the outside. Seen that type thing a lot on 70s cars people just never opened the hood on and kept serviced.