PCV - Positive Crankcase Ventilation

Question

PCV stands for Positive Crankcase Ventilation. It's a system in internal combustion engines designed to remove harmful gases (blow-by gases) that escape from the combustion chamber into the crankcase.

How it Works:

1. Blow-by Gases: During engine operation, some combustion gases slip past the piston rings into the crankcase. These gases contain unburned fuel, moisture, and other harmful compounds.
2. Ventilation: The PCV system uses a valve (PCV valve) to control the flow of these gases. It routes them from the crankcase back into the intake manifold, where they are burned again in the combustion process.
3. Pressure Regulation: The system prevents excessive pressure buildup in the crankcase, which could damage engine seals or cause oil leaks.

Common Signs of a Faulty PCV System:

• Oil leaks or excessive oil consumption
• Rough idling or engine stalling
• Increased engine sludge
• Poor fuel economy
• Excessive blow-by

In the context of your turbo hose leak, a faulty PCV valve could cause excess crankcase pressure, pushing oil into the intake system and potentially into the turbo.