Systems of injection of fuel. BMW the 5th E28/E34 series (from 1981 to 1993 of release)
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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
4.1. General information
4.2. Pressure removal in system of injection of fuel
4.3. Check of pressure of fuel / fuel pump
4.4. Removal and installation of the fuel pump, intermediate pump and fuel level sensor
4.5. Repair and replacement of fuel lines and connectors
4.6. Removal and installation of a fuel tank
4.7. General information about cleaning and repair of a fuel tank
4.8. Removal and air purifier installation
4.9. Check, adjustment and replacement of a cable of an accelerator
4.10. General information about the carburetor
4.11. Removal and carburetor installation
4.12. Cleaning and carburetor adjustment
4.13. General information about fuel injection
4.14. Systems of injection of fuel
4.15. Check of functioning of system of injection of fuel
4.16. Functioning check, removal and installation of a measuring instrument of a stream of air
4.17. Functioning check, removal and installation of the case of a throttle
4.18. Check of functioning and replacement of a regulator of pressure of fuel
4.19. Check of functioning and replacement of an injector of cold start and temperature switch
4.20. Check of functioning and replacement of fuel injectors
4.21. Functioning check, adjustment and replacement of the air valve of stabilization of idling
4.22. Search of malfunctions of system of injection of fuel
4.23. Diagnostics of malfunctions of a power supply system
5. Ignition system
6. Control systems of the engine and decrease in toxicity of the fulfilled gases
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
 








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4.14. Systems of injection of fuel

System of injection of L-Jetronic fuel

The system of injection of Bosch L-Jetronic fuel was applied on the majority of the E28 models (“an old sample”). In this fuel system of injection with electronic control it is used on each cylinder on one solenoidal injector. The system copes the Electronic Control unit (ECU) which processes information received from various sensors, and further makes for cylinders an exact dosage of fuel, regulating time of an open condition of an injector. The electric fuel pump through lines of supply of fuel and the filter built in the line provides giving under a high pressure of fuel to injectors. The regulator of pressure provides supply of fuel under optimum pressure, allowing pressure to fall and increase depending on turns and engine loading. All surpluses of fuel on the separate line come back back to a fuel tank.

The sensor continuously measures amount of arriving air, and ECU in an air line of an admission of air for receiving an optimum ratio of a mix air / fuel regulates a fuel mix.

Other components which are a part of system, the sensor of temperature of a cooler, the sensor of provision of a throttle, the valve of stabilization of turns of idling (which for stabilization of turns of idling air takes away, passing the throttle valve) both the related relays and safety locks are the throttle valve (which operates an air stream).

System of injection of Motronic fuel

The Motronic system unites in one block management of fuel of system of injection of L-Jetronic with management of the ignition moment, turns of idling and release.

Functions of management by injection of fuel and turns of idling are similar to the functions of L-Jetronic system described above. For additional data on Motronic system address to Head of the Control system of the engine and decrease in toxicity of the fulfilled gases.

The oxygen sensor on late models with the catalytic converter is established in release system, This sensor continuously measures the content in the fulfilled gases concentration of oxygen. This information is used by ECU for adjustment of duration of injection, giving opportunity to establish structure of a fuel mix for optimum efficiency of the converter and a toxicity minimum.


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4.15. Check of functioning of system of injection of fuel