When your engine is running, air pressure builds up inside the crankcase, the compartment where the crankshaft and engine oil is located. This pressure is caused by exhaust gases produced during combustion that leaks past the pistons and into the crankcase. If left unchecked, the exhaust can contaminate the engine oil and create sludge. Excess crankcase pressure can also lead to engine leaks.
The PCV system allows the gasses inside the crankcase to be rerouted to the engine intake where they are able to be drawn into the engine to be burned. In the process, the vapors are prevented from entering the atmosphere. For this reason, the PCV system is often considered to be part of the emission control system. The PCV hose plays a critical role, as it connects the PCV valve to the intake manifold vacuum to allow the vapors to re-enter the engine.
PCV stands for “positive crankcase ventilation”. Therefore, it follows that the PCV valve is located on the crankcase, the lower part of an engine where the crankshaft is housed. The PCV hose is attached to the PCV valve and extends to the intake manifold on the top of the engine. To replace a PCV hose, a technician will follow these general steps:
If the PCV hose is damaged, deteriorated, or fails to seal correctly for any reason, it will not allow manifold vacuum to be maintained inside the system. This will also prevent the PCV valve from working properly, since vacuum is what activates the PCV valve. When this happens, the oil inside your engine will eventually collect moisture and contaminants, resulting in material breakdown. When your oil breaks down, it loses viscosity and develops sludge. Engine leaks are also common when excessive pressure builds inside the engine crankcase.
If your PCV hose is bad, any of the following symptoms are possible:
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