Skip the auto shop - Our mechanics make house calls
  1. Home
  2. Articles
  3. How to Buy a Good Quality Positive Crankcase Ventilation (PCV) Valve

How to Buy a Good Quality Positive Crankcase Ventilation (PCV) Valve

Good quality PCV valve

The positive crankcase ventilation (PCV) helps create the division of emission-control devices; it routes the leftover combustion gases from the bottom of the engine and the oil pan back into the crankcase where instead of escaping into the atmosphere they are burned in the combustion chambers.

While there are a few newer models of vehicles that don’t have the valve to limit the flow of gases, the majority of vehicles on the road today do have this part. The PCV valve serves to keep the system from clogging by opening and closing on schedule. If the part fails it may result in sluggish acceleration, a rough idle, or increased oil consumption.

A few things to know about your PCV valve

  • Normally mounted on a grommet or valve cover or at the end of the tube, a PCV is pretty easy to evaluate for effectiveness. Remove the valve and shake it, if there is a solid rattling noise then the part is most likely in good working order.

  • Hoses and tubes with gases and exhaust running through them always run the risk of becoming clogged from built-up sludge or excessive leakage. Cleaning the full system whenever you replace the vehicle’s air filter also reminds you to test the airflow through the PCV valve to ensure proper functioning.

  • Oil consumption is increased when pressure builds inside the crankcase. The vapors that aren’t allowed to leave the chamber cause a domino effect; oil won’t flow past gaskets and seals, leading to increased pressure. Alternatively, too much air in the system lightens the fuel-air mixture which will probably result in the Check Engine Light turning on.

  • Flow testers are also a great tool to verify correct functioning of the part as they can check both the air flow and the vacuum at the same time.

Keeping your PCV valve and hose system in good working order assures that the vehicle is receiving the correct ratio of air to fuel and also keeps emissions output under control.

YourMechanic supplies top-quality PCV valves to our certified mobile technicians. We can also install a PCV valve that you've purchased. Click here to get a quote and more information on PCV valve replacement positive crankcase ventilation.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Skip the repair shop, our top-rated mechanics come to you.

At your home or office

Choose from 600+ repair, maintenance & diagnostic services. Our top-rated mechanics bring all parts & tools to your location.

Fair & transparent pricing

See labor & parts costs upfront, so you can book with confidence.

12-month, 12,000-mile warranty

Our services are backed by a 12-month, 12,000-mile warranty for your peace of mind.

Get A Quote

Need Help With Your Car?

Our certified mobile mechanics make house calls in over 2,000 U.S. cities. Fast, free online quotes for your car repair.


More related articles

Insurance Requirements for Car Registration in Kentucky
The Kentucky Transportation Cabinet requires that all drivers in Kentucky carry liability automotive insurance, or “financial responsibility” in order to operate a vehicle legally and maintain vehicle...
P2422 OBD-II Trouble Code: Evaporative Emissions Control System (EVAP) Vent Valve Stuck Closed
Diagnostic Trouble Code (DTC): P2422 P2422 code definition Evaporative Emissions Control System (EVAP)...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...

Related questions

Q: Broken timing tensioner pulley

Hello there, a broken timing belt tensioner pulley will cause big issues with your 1990 BMW 325i. When the timing belt slips or breaks it can cause the valve timing to get thrown off and the valve can hit the...

Q: My car chokes on start up, sometimes it turns on fine but other times it will choke or even turn completely off.

The intermittent engine stalling may be the result of a dirty or faulty idle air control valve. This could also be caused by a leaking or faulty fuel pressure regulator, which is delivering too much fuel or not enough fuel....

Q: There's an oil leak coming from my valve gasket or VVTI seal oil area

sent to CS.