How to Change a PCV Valve on a Jeep Liberty

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The positive crankcase ventilation or PCV valve plays an important role in the pollution-control system on the Jeep Liberty. The PCV valve vents positive pressure inside the engine (called the crankcase) back into the engine air intake to make sure no unburned hydrocarbons from the crankcase are vented into the atmosphere. Making sure the PCV valve is operating correctly ensures that your Jeep Liberty is working efficiently.

Things You'll Need

  • Replacement PCV valve
  • Find the PCV valve sticking out from the oil-fill tube with a black rubber vacuum hose coming from it.

  • Push the PCV valve in and twist it to the left, then pull straight out to remove the old PCV valve.

  • Remove the rubber vacuum hose from the PCV valve by pulling it straight off the old valve. Discard the old PCV valve.

  • Install the new PCV valve into the side of the oil-fill tube by pressing it in and twisting to the right until it is tight.

  • Reattach the vacuum tube onto the new PCV valve by pushing it straight on.

Tips & Warnings

  • Because the Jeep Liberty uses an all-plastic PCV valve, it can break if too much force is applied to it.
  • If the vacuum hose is difficult to remove from the PCV valve, twist it on the PCV valve barbed fitting. Once the hose turns easily on the PCV fitting, it will be easy to remove it from the PCV valve.
  • To determine if your PCV valve requires replacement, remove it using the instructions in this article. Once removed, shake it in your hand. If you hear a rattle, the valve does not require replacement. If the valve does not rattle, the valve is stuck and should be replaced.
  • To make locating the PCV valve easier, use the replacement PCV valve as an example of what to look for.
  • Old PCV valves can be very brittle. Use care when removing the valve to avoid breaking it.
  • Inspect the vacuum running to the PCV valve. If it is cracked or has a hole in it, replace the vacuum line when you replace the PCV valve.

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