Can someone explain the function PCV
Thread Starter
Intermediate
Joined: Nov 2018
Posts: 25
Likes: 7
Can someone explain the function PCV
My C7, due to its year of manufacture, still has two of these "valves" that can be easily removed and tested, if you know how they're supposed to work 🤪.
The flow should be from the crankcase towards the intake. The valve "rattles," I cleaned it with brake cleaner, and there's almost no visible oil residue. In its installed position (valve opening angled downwards), the valve can be blown through from both sides. When I remove the valve and hold it with the opening facing upwards, the valve closes when blowing towards the crankcase, but that's not how the valves are installed. I bought both valves (in my case, they're the complete hoses with the valves) new, and it's exactly the same. As I understand it, the PCV valves cannot function as valves in their installed position. Could someone explain this to me?
The flow should be from the crankcase towards the intake. The valve "rattles," I cleaned it with brake cleaner, and there's almost no visible oil residue. In its installed position (valve opening angled downwards), the valve can be blown through from both sides. When I remove the valve and hold it with the opening facing upwards, the valve closes when blowing towards the crankcase, but that's not how the valves are installed. I bought both valves (in my case, they're the complete hoses with the valves) new, and it's exactly the same. As I understand it, the PCV valves cannot function as valves in their installed position. Could someone explain this to me?
Thread Starter
Intermediate
Joined: Nov 2018
Posts: 25
Likes: 7
Hallo Jack, danke für deine Antwort. Wie du beschrieben hast, sollte das Ventil genau gleich funktionieren; das war auch mein Verständnis. Leider hat das Ventil, genau wie die neuen, die ich bestellt habe, nach dem Einbau keinerlei Funktion, außer als Schlauch. Wenn man von der Ansaugseite in das ausgebaute Ventil suck, während die Ventilöffnung (motorseitig) nach oben zeigt, schließt es. Aber es ist in die falsche Richtung gerichtet und natürlich nicht so eingebaut. Wenn die Ventilöffnung nach unten zeigt, wie es im eingebauten Zustand der Fall ist, lässt sich die Ventilfunktion nicht reproduzieren. Neue Ventilschläuche rechts und links zeigen keinen Unterschied zu den zuvor eingebauten. Könnte es sich um einen Konstruktionsfehler von GM handeln, der später zu Änderungen an den Ventilen geführt hat?
Last edited by meikel24; Yesterday at 07:22 AM.
Racer
Joined: Nov 2015
Posts: 260
Likes: 86
From: Brighton MI
As opposed to sending it into the atmosphere as done in the old day when we had Road Draft Tubes.
I have installed catch cans on all of our vehicles to reduce the amount of crankcase emissions that flow through the throttle body.
I have installed catch cans on all of our vehicles to reduce the amount of crankcase emissions that flow through the throttle body.
