How to Check & Change a PCV Valve on a Volvo 850

Written by johnathan cronk
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How to Check & Change a PCV Valve on a Volvo 850
Engine manifold and surrounding components (engine image by goce risteski from

The PCV valve, known as the positive crankcase ventilation valve, is a component within your Volvo 850 and is responsible for sending burnt gases from the crankcase to the combustion chamber. The valve is a crucial component in reducing pressure within the crankcase. As pressure builds up, the components surrounding the crankcase are in danger of being damaged. Excessive pressure can cause oil to seep through seals and leak into various components. It is common for the valve to become clogged over time. If the valve becomes clogged, it is imperative that you check and replace it as soon as possible.

Skill level:
Moderately Easy

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Things you need

  • Owner's manual
  • Needle-nose pliers
  • New PCV valve

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  1. 1

    Turn the Volvo 850 off and allow the engine and its components to cool for 30 minutes.

  2. 2

    Open the bonnet of the Volvo 850 by pressing the hood release button within the vehicle. Locate the PCV valve; the valve is identified as a small rubber valve located on the engine crankcase. You will also notice a small hose sticking out of the end of the valve. If needed, read the Volvo 850 owner's manual for more information.

  3. 3

    Disconnect the hose from the valve by pulling the hose out of the valve. The hose will come off the valve with minimal force.

  4. 4

    Turn on the engine of the Volvo 850. Place your finger over the hole in the valve where the hose was connected. If you feel a strong suction, the valve is working properly and fine. If you do not feel a strong suction, the valve may be clogged and needs replacing.

  5. 5

    Turn off the engine of the Volvo 850. Use needle-nose pliers and grip the valve. Pull the valve off of the crankcase.

  6. 6

    Install a new valve by putting the valve in place on the crankcase. Insert the hose into the new PCV valve. Secure the new valve in place by pushing it down until it locks into place. Close the bonnet of the Volvo; pull up on the hood to ensure the hood is shut properly.

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