Control systems of the engine and decrease in toxicity of the fulfilled gases. 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. Control systems of the engine and decrease in toxicity of the fulfilled gases

General information

Some systems of decrease in toxicity of the fulfilled gases are applied to prevention of pollution of the atmosphere because of incomplete combustion or evaporation of fuel and for maintenance high road performance and economy of fuel in these cars. Not all from these systems are established on all models, however, they include:

  • Catalytic converter
  • Catching system паров gasoline (EVAP)
  • System of ventilation of a case (PCV)
  • Electronic control system of the engine

Sections of this Chapter include the general descriptions and procedures of checks within possibilities of a house workshop, also as well as procedures of replacement of components (where it is possible) for all listed above systems.

Before the assumption of malfunction of system of decrease in toxicity, carefully check fuel system and ignition system. Diagnostics of some devices of system of decrease in toxicity needs special tools, the equipment and preparation. If check and service become too difficult or if procedure appears outside of your possibilities, consult at the dealer or other expert.

The most frequent reason of problems in system of decrease in toxicity is leak in a vacuum hose and weakening of a wire therefore always first of all check connections of hoses and wires.

It, however, does not mean that the system of decrease in toxicity is especially difficult for serving and repairing. You can quickly and easily execute many checks and to make the most part of periodic service of the house ordinary devices and manual tools.

Pay close attention to any special precautionary measures given in this Chapter. It should be noted that illustrations of various systems can correspond not absolutely precisely to the systems established on your car as in the course of production the manufacturer makes changes.

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5.9. Check and replacement of sensors ignitions (Motronic system)
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6.1. General information