GM 8996086 Valve,Pcv

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To solve this problem, the positive crankcase ventilation (PCV) system circulates fresh air through the crankcase in order to pick up blow-by gases, which are then rerouted back to the engine through a carburetor. Vacuum hoses and a PCV valve, which regulate the flow of gases according to engine speed and manifold vacuum, are the main components of this system. Carbon and gunk that accumulate in the PCV valve and hoses over time may cause them to jam, hence regular scrutiny is needed to ensure they function properly. Poor idling or reduced idle speed may indicate a restricted or stopped flow in the system. To test for proper vacuum pull off the top plate of the air cleaner and remove the hose leading to the small PCV filter. While your engine is idling put your thumb slightly on towards the end of this hose. A feeling as if there is a slight pull or suction tells that air is being drawn through it. If any vacuum is felt there should be further checks since low or no vacuum will mean that blocking has taken place within this system. By shaking it you can check whether the PCV valve clicks; if it does not, it should be replaced because its check needle does not work properly anymore. When running at idle speed with valve removed, engine should result in a relatively strong vacuum pressure. If there's no or very little difference felt in terms of vacuum pressure either way it might indicate blocked vacuum hose or inlet fitting at engine manifold. Clearing out passages clogged at manifold or carburetor require thorough cleaning, while failure of pcv valve necessitates replacement thereof. When buying a new one for your engine just make sure that you don't get something else instead of genuine PCV valves.

The PCV valve is located in the rear of the intake manifold on V6 engines for 1981-87 models.

To check for proper vacuum, remove the top plate of the air cleaner and disconnect the hose leading to the small PCV filter. With the engine idling, place your thumb lightly over the end of the hose. You should feel a slight pull or vacuum if the system is functioning properly.

The breather filter should be replaced when the air cleaner element is replaced.

Before installing the new PCV valve, you should compare it with the old one to ensure they are identical.

More information on the PCV system can be found elsewhere.

If the rubber grommet is damaged, you should replace it with a new one.

The hose connected to the PCV valve runs to the carburetor.

The PCV system should be checked regularly because carbon and gunk can clog the PCV valve and hoses over time, leading to reduced or stopped flow in the system.

The PCV valve is connected to a hose that runs to either the carburetor or the intake manifold.

The PCV valve is located in either the rocker arm cover or intake manifold.