PCV Valve

[Matthew]

I have an 81 Chevy Malibu.I want to hook up the Pcv valve on the back passenger side.Where should I hook it up to…Either the back vacuum carb port or to the manifold vacuum port?

Topic

[Tom]

Man, it has been a while since I worked on a carbed engine lol. Lemme blow some of the dust off my memory and see if I can help you with this one.

If I recall correctly, you don’t want PCV at idle, you want it above idle. Manifold vacuum will be highest at idle, giving you a signal then. So, I’m going to say that PCV should be attached to a vacuum port that is above the throttle blades in your carb so that it is getting vacuum only when the throttle is open.

[Bill]

The base of the carburetor is the only place to hook a PCV valve to. If connected to the manifold it could cause cylinders to run lean.

[college man]

if I remember my 70 mach 1 days.back of carb port.

[Author]

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