the hose from ur valve cover 2 your intake..

[johnnyblaze2g]

what exactly does this hose do? it seems like a bad idea to suck oil into your intake, or is it needed on the valves..any answers..?

[cloudasc]

Its part of the PCV (positive crankcase ventilation) system, quoted from http://en.wikipedia.org/wiki/Pcv_valve

The PCV valve is only one part of the PCV system, which is essentially a variable and calibrated air leak, whereby the engine returns its crankcase combustion gases. Instead of the gases being vented to the atmosphere, gases are fed back into the intake manifold, to re-enter the combustion chamber as part of a fresh charge of air and fuel. The PCV system is not a classical "vacuum leak". All the air collected by the air cleaner (and metered by the mass air flow sensor, on a fuel injected engine) goes through the intake manifold. The PCV system just diverts a small percentage of this air via the breather to the crankcase before allowing it to be drawn back in to the intake tract again. It is an "open system" in that fresh exterior air is continuously used to flush contaminants from the crankcase and into the combustion chamber.

The system relies on the fact that, while the engine is running, the intake manifold's air pressure is always less than crankcase air pressure. The lower pressure of the intake manifold draws air towards it, pulling air from the breather through the crankcase (where it dilutes and mixes with combustion gases), through the PCV valve, and into the intake manifold.

The PCV system consists of the breather tube and the PCV valve. The breather tube connects the crankcase to a clean source of fresh air, such as the air cleaner body. Usually, clean air from the air cleaner flows in to this tube and in to the engine after passing through a screen, baffle, or other simple system to arrest a flame front, to prevent a potentially explosive atmosphere within the engine crank case from being ignited from a back-fire in to the intake manifold. The baffle, filter, or screen also traps oil mist, and keeps it inside the engine.

Once inside the engine, the air circulates around the interior of the engine, picking up and clearing away combustion byproduct gases, including a large amount of water vapor, then exits through a simple baffle, screen or mesh to trap oil droplets before being drawn out through the PCV valve, and into the intake manifold.

[TypeG]

there's also a baffle in the valve cover, so you don't suck up oil directly. you just suck up oil vapors. later.

[cornerkid322]

so, per-say i dis-connect that hose and put a breather filter on instead, would this affect idle or the condition of the engine? always been a question in the back of my head...

[cloudasc]

so, per-say i dis-connect that hose and put a breather filter on instead, would this affect idle or the condition of the engine? always been a question in the back of my head...

No it would not affect the idle or the condition of the engine. If where you live has visual inspections, it could cause you to fail. The reason its there is to keep blowby gasses from going into the atmosphere.

[cornerkid322]

sweet, thank you for answering that! an no worries, my brother is a mechanic/certified inspector. he just pulls my car in and checks everything off without even looking at it. pretty sweet deal don't ya think?