#### TESTING

Check the PCV system hoses and connections, to see that there are no vacuum leaks. Then replace or tighten, as necessary.

With the engine running at idle, remove the ventilation hose from the PCV valve. If the valve is working properly, a hissing noise will be heard as air passes through it and a strong vacuum should be felt when a finger is placed over the valve inlet. Refer to the illustrations.

To check the valve, remove it and blow through both of its ends. When blowing from the side which goes toward the intake manifold, very little air should pass through it. When blowing from the crankcase (valve cover) side, air should pass through freely. Replace the valve with a new one, if the valve fails to function as outlined.

Fig. 1:Check the PCV valve for vacuum at idle