BMW 3 series E30

Since 1983-1994 of release

Repair and car operation

+ 1. The maintenance instruction
+ 2. Maintenance service
+ 3. The engine
+ 4. Cooling system
+ 5. Heating and ventilation
- 6. Fuel system
   6.2. Specifications
   6.3. Check of system of injection
   6.4. A measuring instrument of a stream of air
   6.5. A throttle branch pipe
   6.6. A regulator of pressure of fuel
   6.7. An atomizer of start-up of the cold engine and a thermotimer
   6.8. Check and replacement of atomizers
   6.9. The air proof-reader of idling
   6.10. An order декомпрессии fuel system
   6.11. Check of pressure of fuel
   6.12. The fuel pump, the pump of pumping and the gauge of level of fuel in a tank
   6.13. Gasoline pipe lines and the union
   6.14. A fuel tank
   6.15. The air filter
   6.16. A cable of a drive throttle заслонки
   6.17. The carburettor
+ 7. An exhaust system
+ 8. Transmissions
+ 9. Coupling
+ 10. Brake system
+ 11. A running gear
+ 12. A body
+ 13. An electric equipment
+ 14. A good advice

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6. Fuel system

6.1. Introduction

Considered cars are equipped by system of injection of fuel, except models 316 on which carburettors Solex 2B4 (cars of early release) and Solex 2BЕ (later release are established). The fuel pump of carburettor engines mechanical, with кулачковым a drive from a cam-shaft.

System of injection of type L-Jetronic or Motronic. Since 1988 cars are equipped with advanced system Motronic in which there is no atomizer for start-up of the cold engine. The electric fuel pump is mounted or in a back part of the car, on the body bottom (on early models), or in a fuel tank. In system Motronic of the relay of injection works from a signal from the block of management (ECU-block). At ignition inclusion the fuel pump works within several seconds and is disconnected only after a full stop of the engine. On early models the pump of pumping of the low pressure, mounted in a fuel tank and included consistently with the basic pump is provided. The basic pump provides maintenance of necessary pressure of fuel. Maintenance of constant pressure at the moment of injection is provided with a regulator of pressure and a suppressor of pulsations of pressure (last is mounted about the fuel filter).

The system of injection of fuel of considered cars consists of 3 subsystems – fuel, a fence of air and the processor block of management.

Fuel system

The fuel pump provides fuel giving through the filter in the distributor under constant pressure. Stabilisation of pressure of fuel on a distributor exit is provided with a pressure regulator.

System of a fence of air

Consists of an air cleaner, a measuring instrument of a stream of air, the throttle branch pipe, a soaking up collector and connecting hoses and branch pipes. The measuring instrument of a stream of air лопастного type, air expense is proportional to an angle of rotation заслонки and to resistance of the potentiometer, rigidly connected with an axis заслонки.

The electronic block of management

On the car the electronic block of management (ECU) which provides automatic adjustment of the moment of ignition and also quantity and structure mix fuel-air according to the information from the various gauges tracing power setting is established. The structure of auxiliary elements of system (gauges, switches, etc.) is defined by a concrete kind of applied system of injection.

Applied systems of injection

System of injection of type L-Jetronic of firm Bosch (till 1987)

System of injection L-Jetronic
1. A fuel tank
2. Рапределитель fuel
3. A pressure regulator
4. The processor block
5. The relay
6. A measuring instrument of speed of a stream
7. The ignition switch
8. The battery
9. Throttle заслонка
10. The switch throttle заслонки
11. The valve of start of the cold engine
12. The proof-reader of idling
13. The ignition distributor
14. A thermotimer
15. The gauge of temperature of the engine
16. The oxygen gauge
17. An atomizer
18. Fuel фильт
19. The fuel pump

System однофорсуночная with an electromagnetic atomizer. The core in adjustable parametres are duration of an open condition of atomizers (quantity of injected fuel) and idling turns. Auxiliary elements of system are the gauge of temperature of a cooling liquid, the switch throttle заслонки, the idling stabilizer (перепускной the air valve), the relay and safety locks.

System of injection of type Motronic

System of injection Motronic
1. A fuel tank
2. The processor block
3. Гаситель pulsations
4. A regulator of pressure of fuel
5. The valve of start of the cold engine
6. The switch throttle заслонки
7. A measuring instrument of speed of a stream
8. The proof-reader of idling
9. The relay of the fuel pump
10. The main relay
11. The ignition switch
12. The battery
13. The gauge of an angle of rotation коленвала
14. Throttle заслонка
15. The gauge of speed of rotation коленвала
16. The gauge of temperature of the engine
17. A thermotimer
18. The oxygen gauge
19. The ignition coil
20. A candle
21. An atomizer
22. The ignition distributor
23. The fuel pump
24. The fuel filter
25. The fuel distributor

System многофорсуночная with electromagnetic atomizers. Adjustable parametres are the quantity of injected fuel, the ignition moment, turns of idling and structure of exhaust gases.