Back to all

PCV Valve: What Is It?

October 21, 2018

Most Fort Wayne 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. Fort Wayne 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 Fort Wayne - Dupont Rd..

The PCV system reduces harmful vehicle emissions. The maintenance it requires is simple and inexpensive at Tuffy Fort Wayne - Dupont Rd.. A fouled or damaged PCV system can lead to serious engine damage for Fort Wayne drivers.

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

Tuffy Fort Wayne - Dupont Rd.
1910 W. Dupont Rd.
Fort Wayne, IN 46818
260.489.4800

More articles from Tuffy Fort Wayne (Dupont Rd.)

Not So Cool (Air Conditioning Systems)

September 14, 2025

There's nothing quite like getting in your vehicle on a hot day, switching on the air conditioning and having warm air blow out of the vents. You may have had no problem for months and then, one day, you are driving around in a sauna. You're hot stuff, but not in a good way! So what goes wrong w... More

Keeping Yourself in Suspension (Control Arm Assembly Replacement)

September 7, 2025

When you are pointing your vehicle straight down the street, it should go straight. Thats pretty straightforward, right? Sometimes, though, you may notice you have to keep adjusting the steering wheel to keep going straight. While that could be caused by many different issues, one possibility i... More

Conventional or Synthetic? (Switching to Synthetic Oil)

August 31, 2025

If you keep up on technology trends, then you may be intrigued about synthetic motor oil. It was introduced in the 1960s when Mobil came up with it. Mobil's oil was different from conventional motor oil because it was first broken down to its basic molecules. Then, Mobil removed additional imp... More