Catching system паров gasoline (EVAP). BMW the 5th E28/E34 series (from 1981 to 1993 of release)
Repair of BMW E28 and series E34 from 1981 to 1993
1. Cars of the BMW brand of 5-series
2. Engine
3. Cooling system
4. Power supply system
5. Ignition system
6. Control systems of the engine and decrease in toxicity of the fulfilled gases
6.1. General information
6.2. General information about self-diagnostics of a control system by the Motronic engine
6.3. Removal and installation of the electronic control unit (ECU)
6.4. Information sensors
6.5. System of ventilation of a case (PCV)
6.6. Catching system паров gasoline (EVAP)
7. System of production of the fulfilled gases
8. Coupling
9. Manual box of gear shifting (RKPP) and automatic transmission (AT)
10. Transmission line
11. Steering and suspension bracket
12. Brake system
13. Body
14. Control body sizes
15. Heater and air conditioner
16. System of onboard electric equipment
17. Routine maintenance of the car
18. Size table and adjusting data
19. Schematic electric circuits
20. Governing bodies and operation receptions
21. System of onboard diagnostics - a principle of functioning and codes of malfunctions


6.6. Catching system паров gasoline (EVAP)

General description

The EVAP system scheme on the M10 engine (the others - similarly)

This system is usually established on the cars equipped with the catalytic converter.

When the engine is muffled, fuel in a fuel tank evaporates, created pressure паров. The catching system паров gasoline accumulates these pairs in capacity with an adsorber. Under way the removal valve паров is a little slightly opened and fuel pairs gradually arrive in the inlet pipeline and burn down. When start of the cold engine or the engine is made idles, the removal valve паров does not allow pairs to arrive in the inlet pipeline and to enrich a fuel mix excessively.

Removal valves паров two types are applied: with electric management and vacuum management. To define, what valve is established on your car, track a hose from capacity with an adsorber, yet will not find the valve. Some valves are established on the inlet pipeline, others - near capacity with an adsorber. Look, whether there is on the valve an electric socket or the vacuum line approaches to it.

The faulty system EVAP influences road performance of the engine only when it is heated-up. The EVAP system usually is not at the bottom of difficult cold start or other problems on the cold engine.


Removal valve паров vacuum-operated


  1. Disconnect from the valve the vacuum line and blow in the bigger union of the valve. The valve should be closed and air should pass.

On some models the thermovacuum valve is established, which interferes with removal паров, while the temperature of a cooler will not reach, about, 46 ° S.Proverte this valve to be convinced of its operation under the influence of a razryazheniye at the correct temperature. The valve is usually located in the inlet pipeline near the temperature switch and the sensor of temperature of a cooler.

  1. Disconnect from the removal valve паров a thin vacuum hose and the manual vacuum pump on an entrance of the valve create a razryazheniye. The valve should open and start to pass air.
  2. If the test yields negative result, replace the valve.

The removal valve паров with electric management


  1. Disconnect from the valve all lines (except the electric socket) and move it to a place convenient for testing.
  1. Check that the valve at inclusion of ignition publishes click.
  1. If the valve does not publish click, disconnect from the valve the socket and a control lamp or the voltmeter check power supply.
  1. If tension of the battery is present, but the valve does not work, replace it. If tension is absent, check the block of control of Motronic and a wire.

Capacity with an adsorber


  1. Note an arrangement of all hoses, then disconnect them from capacity.
  1. Put forward capacity from a fixing collar. On some models it is necessary to weaken a collar.
  1. Visually check on capacity existence of leaks and damages.
  2. At detection of leaks and damages replace capacity.

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7. System of production of the fulfilled gases