What is it?
A Positive Crankcase Ventilation valve is an element of your vehicles emission system.
How Does It Work?
The PCV valve connects via a hose to the crankcase.
It moderates dirty air and gases from crankcase.
The leftover material is then returned to intake manifold to be burned again in the combustion chambers.
How Is It Made?
Most are drawn, stamped or molded material that has a valve that controls the flow from the crankcase to the air filter box.
Why Does It Fail?
Over a period of time, 12 months or 12,000 miles, the valve can be become clogged and or restrictive.
It comes off the crankcase and release fumes that can be corrosive, sticky and or carbon filled. All can lead to restriction and or failure.
What are Symptoms of Failure?
Rough idle
Tough starting
Poor fuel economy
Check engine light
What Are the Consequences of Failure?
No start
Sudden engine failure
Poor fuel economy
Failed emissions