The PCV ventilation valve (positive basement ventilation) is a forced ventilation system. In short: eliminate the exhaust gases from the envelope, preventing them from contacting the oil.
If it does not work correctly, it can also reach the destruction of symmetry.
The valve is activated every time a void is created in the suction tunnel and the degree of opening of the valve depends on the amount of emptiness. In total it has 3 operating modes:
- Inactive – large emptiness, low flow;
- Access – low emptiness, large flow;
- Stopping engine – pressure without flow.
In conclusion, the PCV valve has the following activities:
- Use the vacuum of the engine to extract the spurous gases from the Carter;
- Push the gases along the suction gallery and return to combustion cameras, where they will be burned again.
When the valve is activated, the gases that entered the Carter entered the suction tunnel again (according to the EGR operational principle).
1.1 What frequency should the PCV valve be replaced?
Many drivers are wondering how often the PCV valve should be changed, but it is good to know that this valve has not established. It may be necessary depending on how you keep the car, from the way you drive it and the roads that travel.
From the estimates made by the mechanics it is appreciated that if the car went on the highway, the PCV valve resists 150,000 km, but if the car was performed at a short distance or with cobbled roads, it produces about 50,000 km.
In the case of cars that travel on short roads, the explanation is clear: the oil does not have time to reach a temperature to which the humidity can evaporate, which leads to a faster oxidation of the valve and automatically to block it. Another explanation would be that the oil degrades much faster, losing its lubricating properties.
1.2 Where is the PCV valve located?
The positioning of the PCV valve is different depending on the car. Usually, however, it is incorporated into the internal combustion engine valve lid, but can be positioned in a more hidden and difficult access.
It is positioned on the Carter, it looks like a small plastic plug, somewhere in the upper half of the engine.
In other cases the valve is between two rubber tubes. It can be just above the engine. It all depends on the car model.
In this image you can see where the PCV valve is located on Matiz.
1.3 PCV valve control
To check the valve valve, follow the following steps:
- Check the integrity of the rubber parts
- Check the sieve under the valve and as a case it can be replaced
- Disconnect the pipes and check them carefully
- Remove the valve and shake it well. If you don’t emit sounds similar to a gloomy, then it is defective and you have to replace it.
In addition to the visual verification of the different models of PCV valves, it is recommended to check a system with the engine in order of work.
In the situation in which you have not started in these automotive operations, probably the best idea would be to go to an authorized service, because if the assembly pipes are confused, you risk having other problems.
If you come from Brasov or surroundings, you can do it Online programming And we are waiting for you in our service!
PCV valve Check with the engine on:
The first time the void is tested:
- Turn on the engine and leave it to the ranks for 20 minutes, to obtain the operating temperature.
- Then open the hood and detach the valve on the lid and block the valve head with your finger. You will feel the void in the ignition system on the tip of the finger and you will notice how the motor speed decreases to about 40 and 80 rpm.
- If the speed decreases more at the moment, it means that the valve is blocked outdoors.
- If you don’t feel the void on the tip of the finger, check the pipes not to block with misery. If necessary, clean the valve and the tubes with a thinner of the lake and a fine brush.
Alternative tests
Take the tube connected to the PCV valve and strangle it. The empty speed will drop from 40, following that after releasing the tube it will return to normal. In the situation in which this does not happen, therefore more than safe both the valve and the tube are limited.
In some engines, access to the PCV is difficult. If you have such a model, you can get joine oil, then cover the Joja hole with a piece of band. Wait about one minute. You will notice that the vacuum cleaner sucks and presses the ribbon on the hole. Otherwise, there are losses or the system is clogged. Check the conditions of the pipes, respectively the connections, their gaskets.
2. Pcv valve defect symptoms
The most common symptoms of a defective PCV valve are:
- Excessive oil consumption
- Oil leaks – The pressure of the envelope increases by forcing oil to pass through the gaskets
- The presence of water vapor for ventilation – due to the increase in pressure in the Carter
- Engine performance decreases
- increases fuel consumption
- The presence of black smoke from the exhaust
- The engine goes to the fan
- the indicator «Check the engine«Lights up
- The heavy start of the engine
- coarse rags of the engine
- poor air/fuel mixture
2.1 AGRNT engine engine (check-edge)
This witness turns on every time the engine dysfunctions appear. PVC valve failure can be such a situation.
So if you want to be sure, you can use OBD2 or other scanners MultiMercato car tester quality.
With the scan diagnosis you will get the following related error codes: Po52e, Po171, Po300 and Po53a.
2.2 High companions
Considering that the PCV valve has the role of control of the air flow between the casing and the suction tunnel, if the valve is defective, the symptoms are the same as when the suction air is lost, increasing the speed.
2.3 Altitude mixture
An increase in pressure in the envelope due to a defective PCV valve pushes the water vapor through the air. These steam mixed with combustion gases, leave hydrocarbon deposits and oil filter oil, which can increase fuel consumption.
The excess oxygen that penetrates the combustion chamber dilutes the air / fuel mixture, forming a too concentrated fuel mixture. Such a rich mixture can increase the consideration in the exhaust system, which can lead to the engine stop or reduce its performance.
2.4 RATES
A defective PCV valve, as I said before, to obtain an inadequate mixture. Rates (both ranks and acceleration) have the cause exactly this inadequate mixture.
2.5 Heavy acceleration
As in the case of faults, it is guilty of accelerating the car, the entire air/fuel mixture is made, regardless of the speed.
However, in terms of this symptom, it is very important to pay attention. In general, it is easy to diagnose a problem with the PCV valve through a heavy high -speed acceleration. The problem arises, but at small speeds in which it can behave normally, leaving the impression that there are no problems.
2.6 Increase in the consumption of oil and oil losses
When the pipes are clogged, in the machine room there is an overload and, implicitly, an increase in pressure. This will also extend on the cylinders, causing the oil unloading on the gaskets.
In this situation there are oil losses and, implicitly, a much higher consumption.
2.7 Blue and black blue smoke on the exhaust drum
The oil that penetrates the combustion chambers will burn inside the engine and the smoke in the drain tube will be blue.
It is important, however, when you want to diagnose such a problem to pay particular attention to all the symptoms that appear, since many of them can mask other defects.
3. How can you diagnose the problem and how is it possible to test the PCV valve?
There are special scanners to diagnose errors that appear in the case of a defective PCV valve. They are found in any authorized service or can be purchased individually (if you consider that this investment is justified).
On the related error codes that I spoke on top.
3.1 Why are some PCV valves heated?
In the PCV valve and in the tube the condensate is tightened. When temperatures are low, it can freeze, blocking the entire process. In this situation, the pressure within the envelope will increase.
From here the problems arise because high pressure in the envelope leads to the destruction of the gaskets of the gaskets, the increase in oil pressure and implicitly the heating (given that the system consumes energy to perform this struggle).
3.2 Common codes of problems with the PCV valve
Some common error codes occur when the PCV valve works defective. If you see the error codes below, it is 100% about a defective PCV valve. These codes can indicate other defects but if they appear it is better to check the valve first.
The common codes with PCV valve are:
- PO52E – Problems with the functioning of the Ventilation Valve of the Carter
- Po171 – Poor mixture of fuel air
- Po 300 – accidental settings/ignition
- Po53a – Ventilation heater Carter – Open circuit
To diagnose the car and discover the errors relating to the PCV valve, you can face specialized services that will explain what every error has appeared during diagnosis.
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