Do-it-yourself absorber repair Passat

In detail: do-it-yourself absorber repair Passat from a real master for the site my.housecope.com.

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According to the requirements of new environmental standards that limit the content of harmful substances in exhaust gases, vehicles must be equipped with an EVAP system. This equipment prevents harmful fuel fumes from entering the atmosphere. The main function in the fuel vapor recovery system is performed by an adsorber. Some people underestimate the importance of this element in a car's performance. However, a malfunction of this, at first glance, a minor unit can damage the fuel pump and affect the operation of the entire engine. Therefore, experts recommend checking the adsorber valve when signs of engine malfunction appear.

The EVAP system is installed on gasoline internal combustion engines to prevent fuel vapors from entering the atmosphere. The canister purge solenoid valve is part of this system. Therefore, in order to find out what the adsorber valve is for and how it works, it is important to understand the principle of the entire system.
The design of the adsorber is a container filled with an adsorbent, most often activated carbon. The device is connected to the fuel tank and the control valve of the vehicle with special pipes.

The adsorber valve is installed between the intake manifold and the adsorber and performs the ventilation function.

Gasoline vapors generated in the fuel tank enter the separator, where they condense and are drained back into the tank. Some part of the vapors does not have time to condense in the separator and enters the adsorber through the steam line. In the filter system, they are absorbed by activated carbon, accumulate and then, when the engine is started, are fed into the intake manifold.
The absorption of fuel vapors takes place only when the engine is off. When the car is running, the electronic control unit opens the canister purge solenoid valve, through which air enters and thus ventilation occurs. In this case, the accumulated condensate, together with the air, is sucked out of the adsorber and again enters the engine, where it is burned out. The canister valve provides ventilation for the entire mechanism and directs the fuel condensate back to the engine.

Video (click to play).

Almost continuous operation of the canister of the fuel vapor absorption system can cause the purge valve to break.
A malfunction of the adsorber valve often leads to damage to the fuel pump. Due to poor ventilation of the adsorber, gasoline accumulates in the intake manifold, the engine loses power, and fuel consumption gradually increases. This can cause the engine to come to a complete standstill. The operation of the entire car depends on how the adsorber valve works.

Checking the absorber valve

In order to notice and correct problems in time, it is necessary to regularly check the adsorber valve. In this case, it is possible to identify a breakdown by certain indirect signs.
When the engine is idling or in cold weather, the vapor absorption system emits characteristic sounds, as the adsorber valve clicks. Some people confuse this sound with a faulty timing belt, rollers or other parts. You can check this by sharply pressing the gas pedal. If the sound has not changed, it means that the valve of the adsorber is clicking. Experts can explain what to do if the canister valve knocks too hard.To do this, you need to tighten the adjusting screw, while first it is cleaned of epoxy resin.

The absorber valve can be adjusted.

The screw turns approximately half a turn. If you tighten it too much, the controller will generate an error. Such an adjustment of the adsorber valve will make its operation softer and the knocking quieter.
However, how to check the canister valve for breakage?
Valve breakage can be determined using an error diagnosis system or a mechanical check.
Electronic error codes are stored in the controller's memory and indicate electrical damage. To check the valve, it is recommended to pay attention to such errors generated by the controller as “open circuit of the adsorber purge valve control circuit”.
Signs by which it is possible to mechanically determine the malfunction of the adsorber valve:

  1. The appearance of dips at idle speed of the engine.
  2. Very low engine thrust.
  3. No valve actuation sounds are heard when the engine is running.
  4. A hiss when opening the gas tank cap indicates a vacuum in the system. This is a sure sign of a malfunctioning adsorber ventilation.
  5. The smell of fuel in the vehicle interior. However, other reasons can cause its appearance.

If signs of malfunction are found, valve repair or replacement is required. The canister valve is inexpensive and easy to replace. To dismantle, you need to have a pair of Phillips screwdrivers and know where the adsorber purge valve is.
Operating procedure:

The markings of the old and new valve must match.

  1. Open the hood and find a cylindrical device - an adsorber.
  2. Remove the negative terminal from the storage battery.
  3. Disconnect the connector by pushing in the lock and pulling it towards you.
  4. Loosen the valve fastening.
  5. Remove the fittings under the latch and disconnect the hoses.
  6. Remove the valve together with the bracket from the adsorber.
  7. The new valve is installed in the reverse order.

Thus, even such a small element as an adsorber valve performs important functions and its failure can seriously disrupt the operation of the entire engine. Therefore, it is important to monitor the condition of your car and carry out diagnostics on time.

Damage to the device that controls the operation of the gasoline vapor recovery system usually leads to a slight increase in consumption and a small loss of power. At the same time, prompt replacement of the adsorber valve avoids a number of much more serious problems. Due to a violation of ventilation, a vacuum is formed in the tank, which causes an increase in the load on the fuel pump and can lead to the failure of the latter.

With the engine off, the canister purge solenoid valve should be closed. After starting the engine, the control system gives the command to open it, and the air, passing through the EVAP system, is saturated with fuel vapor and enters the intake manifold. Together with the combustible mixture, it enters the cylinder and burns there.

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The electromagnetic device has a winding and an actuator that allows the channel to be closed or opened. The reasons for the failure of the valve through which the adsorber is purged may be as follows:

  • Burnout of wiring or interturn short circuit.
  • Damage to the control circuit.
  • Significant depletion of the valve working surface and seat surface.
  • Violation of tightness due to the ingress of sufficiently large mechanical particles into the chamber.

Diagnostics of the EVAP system involves the use of motor testers, with which the error code is determined. The exact cause of the failure of the valve designed to purge the adsorber is established during the checks of the electrical circuits. For these purposes, a digital or pointer tester with a mode for determining the resistance of the windings is used. A significant deviation from the passport data indicates a winding break.Fault detection of the actuator is impossible due to the fact that the device has a non-separable housing.

After detecting a failure of the electromagnetic device, it will need to be replaced. Due to the design features, repair of the adsorber valve is not performed, an attempt to restore its operability will lead to its destruction and does not make sense. For the same reason, high-quality cleaning of the contaminated unit is impossible. The valve, if necessary, is washed with a solvent and blown out, if a defect remains in its place, a new one is installed.

To eliminate the malfunction, it is necessary to remove the product in the following order:

  • Disconnect the electrical connector.
  • Loosen the clamp screws with a screwdriver and remove both tubes.
  • Remove the bolt securing the valve to the vehicle or engine body.

The installation of a new electromagnetic assembly is carried out in the reverse order, before the connector is docked, a small amount of non-conductive grease is applied to the contact surfaces. This will ensure their reliable protection against corrosion and ease of separation.

The installation of a new unit does not present any particular difficulties for a person with minimal skills in working with a locksmith's tool, especially since it does not require adjustment. The main problem is diagnosing the causes of valve failure, this will require a motor tester and an experienced technician. When decoding fault codes, errors are possible, in addition to the failure of the indicated unit, clogging or damage to the adsorber is likely.

A visit to a car service with modern equipment allows you to quickly eliminate a malfunction of the EVAP system valve. A qualified technician using electronic devices will quickly and accurately determine the cause of the failure and replace the damaged unit.

Actually, I will try to raise this question, since in the search (I searched it up and down) I did not find specific answers. It seems that they tried to discuss this topic several times, but they did not bring it to its logical conclusion.
Attention question: Has anyone removed the absorber from the American, if so, what are the pitfalls and how complicated the procedure itself is.

Well, no one knows, I was the first to decide by such a thing forImage - Do-it-yourself absorber repair Passat

fool around?

100% impossible. I've been. At first I got sick of cutting it. Then he got bored of washing the coal off the balcony.
2 rubles is being analyzed. Quite a worker. I have been skating with this for almost 2 years.

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