Car Problems: Signs That Your PCV Is Bad & How To Fix It Yourself

21 July 2015
 Categories: Automotive, Blog

The PCV valve, or the positive crankcase ventilation valve, is a small crankcase that helps recycle the gases your vehicle produces. This valve is designed to last for some time. But, just like any other component, it may go bad and need to be replaced. The following guide will show you the signs telling you your PCV is bad and how to replace it.

Symptoms Of A Bad PCV Valve

A clogged valve will not allow your engine to recycle some of the gases it produces. This may lead to several issues that you need to know. Pay attention to the following signs of a problem with your valve:

  • You might experience rough idling.
  • The vehicle may start to use too much gasoline per mile.
  • You may see engine oil leaks because of the excess pressure your PCV valve is creating. The engine might also consume too much engine oil to compensate for the pressure the clogged valve is creating.
  • There may be traces of oil deposits on your air filter. These can clog your air filter and decrease engine performance.
  • The clogged valve may cause back pressure on your exhaust pipe due to a bad fuel-to-air mixture. This might cause you to have acceleration issues, or your car may even stall.

You can talk to your auto repair specialist about some of these symptoms. He or she can help confirm your suspicions to help you get rid of this problem.

Replacing Your PCV Valve

You can now replace the valve after you have confirmed your suspicions. You will need the following:

  • Your owner's manual or repair guide
  • Safety goggles and gloves
  • A new PCV valve that fits your vehicle
  • Clean rag


  1. Park your vehicle in a safe and leveled location and make sure it is cool enough to work on.
  2. Put your gloves and goggles on.
  3. Open the hood, and disconnect the negative or red cable from your battery. This is just for your protection.
  4. Locate the PCV valve, which is usually on the passenger side of your engine. Although, it is also sometimes right behind the throttle body. The valve is small and is usually connected to a thick hose. You can refer to your owner's manual or repair guide to help you find it.
  5. Carefully remove the hose from the valve by slightly pulling on it.
  6. Unplug the PCV valve from its place by twisting it counter-clockwise. You will hear a slight popping sound when it is loose. Simply remove it after it is loose.
  7. Use your rag to clean around the area, and clean the hose too.
  8. Insert your new PCV valve in place by twisting it clockwise until it locks in place.
  9. Reconnect the hose to your valve, and reconnect the negative cable to your battery.
  10. Start your car, and hopefully your problems will be over.

Remember that you can have your auto care specialist deal with this if you are not comfortable with the steps. But, as you can see, this issue is something that you can deal with on your own.