Back to all

PCV Valve: What Is It?

January 17, 2021

Most Appleton drivers know something about preventive maintenance on a vehicle. We know we should routinely replace the oil and wiper blades and other fluids. But have you heard of a PCV valve ? This little car part needs to be replaced regularly or it can cause some serious problems in your vehicle engine.

PCV stands for Positive Crankcase Ventilation. The crankcase holds your motor oil and is located at the bottom of your engine.

When fuel is burned in your engine, it produces waste gases that are mostly vented out through your exhaust system. But some of these gases push their way past the pistons and into the crankcase. There, these gases can mix with motor oil to produce oil sludge, which can damage vehicle engine parts through corrosion and by clogging engine passages. Appleton vehicle owners should be advised that if the engine is running at high speeds, these gases can also cause pressure inside the crankcase to build up. This pressure, in turn, can blow gaskets and damage seals, leading to oil leaks.

The waste gases that leave the engine are comprised of about 70% unburned fuel. They used to be vented off the crankcase into the atmosphere. But starting in 1964, laws mandated that these gases be recaptured. Manufacturers began installing PCV systems, which recycled the gases into the air intake system where they could be mixed with fuel and sent to the engine to be burned.

The PCV valve is a one-way valve attached to the crankcase. Waste gases exit the crankcase through the valve but cannot enter.

Over time, the waste gases leave deposits on the PCV valve that can gum it up. So it needs to be replaced occasionally. This is an inexpensive part of preventive maintenance that is often overlooked, but which can have very expensive consequences. It's good auto advice to keep this little valve clean and working well.

In order to maintain efficient circulation, the PCV system also has a breather tube that allows clean air to enter the crankcase. This air is usually filtered through the engine air filter. But some vehicles have a separate air filter for the breather tube called the breather element. If this is the case with your vehicle, proper maintenance of the PCV will include replacing this element. To find out whether your vehicle has this type of PCV system, check your owner's manual or ask your service advisor at Tuffy Tire & Auto Service Center Appleton.

The PCV system reduces harmful vehicle emissions. The maintenance it requires is simple and inexpensive at Tuffy Tire & Auto Service Center Appleton. A fouled or damaged PCV system can lead to serious engine damage for Appleton drivers.

Let's all learn to practice good car care. It's good for our wallets, and it's good for our Wisconsin environment.

Tuffy Tire & Auto Service Center Appleton
2940 E. College Ave.
Appleton, Wisconsin 54915
920-954-8500

More articles from Tuffy Appleton

Do you have a Clue (Get the Most Out of a Service Visit)

December 1, 2024

When you head to the doctor, you probably have it in your mind what you're going to say about why you don't feel good. That way your doctor can use that information to diagnose your problem. You might want to think of that same approach when you take your vehicle in for a repair. Experts say wha... More

Out with the Old (Vehicle Parts that Wear Out)

November 24, 2024

Some drivers don't pay any attention to their vehicles until something breaks. Others take them into their service repair facility for maintenance even before a problem develops. Still, even if you fit into the second group, there are some parts on a vehicle that will simply wear out over time.... More

When Your Air Bag Light Comes On (Illuminated Air Bag Light)

November 17, 2024

There are some dashboard lights you should pay more attention to than others. One is the air bag light. If it's on and your vehicle is in an accident, your air bags probably won't do their job. Automakers began installing air bags in the late 1990's since they were mandatory in the United State... More