Video: 2007-2013 Toyota Corolla How to check and clean the PCV engine valve Yiannis Pagonis

OEM Part Number for Valve Sub-Assembly, Ventilation 12204-22051

OEM Part Number for Hose, Ventilation, No.2 12262-0D080, 12262-22060

OEM Part Number for Clip Or Clamp (For Ventilation Hose) 90467-13103, 90467-19003

When your engine is running thousands of powerful explosions take place to release the fuel’s energy, producing highly toxic and harmful gases.

PCV Valve-After each combustion process, the exhaust valve routes these gases into the exhaust system where the catalytic converter turns them into much less toxic fumes before releasing them into the atmosphere.

Still, a small amount of the gases in the combustion chambers find their way into the crankcase (engine block) by way of pressure leakage between the piston rings and the cylinder wall.

Consequently, Left on their own, these vapors and fumes will play havoc with your engine.

Blow-by gases contain hydrocarbons (unburned fuel), carbon monoxide (partially burned fuel), particulates, water, sulfur, and acid.

Also, Together, these substances will corrode any engine metal component they touch, dilute engine oil, build up harmful sludge that accelerates parts wear, and plug small passages and hoses.

So, In 1961, the PCV system was introduced to deal with this problem.

As a result, This simple emission control system uses engine vacuum to pull blowby gases out of the crankcase, pushing them down the intake manifold and back into the combustion chambers where they are reburned.

The PCV system will fail with poor system or engine maintenance.

Signs of a Bad PCV Valve

You don’t realize how important the PCV system is to the well being of your engine until you understand how a failed PCV valve—or any part of this system—disrupts engine performance and internal components.

A bad PCV valve or related component can produce a number of symptoms. For example, if the valve gets stuck in the closed position or clogs, you’ll notice one or more of these symptoms:

Increase in internal engine pressure

Failure of one or more oil seals or gaskets

Engine oil leaks

Moisture and sludge buildup inside the engine

Engine surges and possibly black smoke

If the PCV valve gets stuck open, or a system hose gets disconnected or ruptured—producing a vacuum leak—you’ll notice one or more of these symptoms:

Engine misfires at idle

Lean air-fuel mixture

Presence of engine oil in PCV valve or hose

Increased oil consumption

Hard engine start

Rough engine idle

In addition, a PCV valve stuck open can trigger the “check engine” light due to increased air flow. However, a diagnostic computer may point to a Mass Air Flow or Oxygen Sensor failure instead, making it harder for you to detect the real source of the problem.

THE ORIGINAL HIPPOCRATES OATH

I remember Apollo the physician, and Asclepius, and Hygieia, and Panacea, and all the gods, and all of them, a historian, and I will do my utmost to make this oath and this writing.

To be led by the one who teaches with this art, as if we were born together, and to share life, and to be used for transmission, and to be born from this to brothers, as if to criticize, and to teach this art, or to be used for memorization, without salary and writing, and without orders and without acrostics and without the rest, to be transmitted as a son to me, and to be like the one who taught me, and to be students, registered and sworn by the law of my mother, and by nothing else.

I will use judgment for the benefit of those who act according to my power and judgment, but I will not declare and act unjustly.

I will not give any medicine or ask for anything deadly, nor will I give such advice. Likewise, I will not give any fluoride to a woman. But I will maintain my life and my art purely and honestly.

I will not cut or stone, but I will leave the work of men to their own devices.

But if I am in a house of some kind, I will enter for the benefit of those who do, except for all unjust will and lust, neither of the other nor of aphrodisiac works on the bodies of women and men, both free and slaves.

If in healing I see or hear, or even without healing, things in the life of men, which should never be spoken of outside, I will be silent, for such things are unspeakable.

They swore to me, therefore, that they would do that, and not forget it, that they might be glorified in life and art, above all men, for all time. But they transgressed and swore, contrary to these things.