How to Replace a Car’s PCV System

PCV stands for Positive Crankcase Ventilation, these valves are one-way valves present in a car’s engine crankcase. It is located in a system containing an intake breather hose and a valve as parts. The emission controls of the engine are maintained by the PCV valve.

A PCV valve blocks because of sludge whenever a car does not have oil changes at certain intervals. Sludge is the oil that is at a place for too long and turns into a solid substance. When this happens, the car’s emission controls will not function normally. Power loss, gas mileages loss, slow car acceleration, poor idling and other problems are signs of a ruined PCV valve.

Car’s PCV System

It is not easy to replace a PCV valve but its not difficult either. This task is easy to do on a sunny day with a hot engine. Here are steps to replace a PCV Valve.


Step 1:

Before starting, one must know how a PCV looks like and where it can be located. The crankcase houses the valve as mentioned earlier. The shape of a PCV is like a small plug made of plastic and placed on the engine’s upper half.

Step 2:

When the PCV has been located, remove any obstructions if present. This will help to ensure that other parts will not get damaged and working on the valve will be easy without anything coming in the way.

Step 3:

Now, the hoses connected to the valve should be loosened. For doing this, use angled nose pliers and start by loosening the upper hose. Don’t grip the hose very tightly because the metal stub can get ruined.

Step 4:

When the upper hose has been disconnected, use nose pliers to firmly grip the PCV valve and yank it out.

Step 5:

To detach the valve completely, detach the remaining upper hose. The hole left by detaching it is the lower hose. This part should be cleaned for ensuring that the replacement valve will be free of blockages. Make sure that no dirt penetrates in the hose.

Step 6:

Now you are ready to install the new PCV valve. It has to be installed into the gapping hole. The part for the upper hose should be placed first. This will be easier now as compared to when you were removing the part.

Step 7:

Don’t forget to place the obstructions back as mentioned earlier. Don’t over-screw them, so they will work efficiently.