BMW 3 Series E30

since 1983-1994 release

Repair and operation of the car

+ 1. Maintenance instruction
+ 2. Maintenance
+ 3. Engine
+ 4. Cooling system
+ 5. Heating and ventilation
- 6. Fuel system
   6.2. Specifications
   6.3. Check of system of injection
   6.4. Air stream measuring instrument
   6.5. Throttle branch pipe
   6.6. Fuel pressure regulator
   6.7. Nozzle of launch of the cold engine and thermotimer
   6.8. Check and replacement of nozzles
   6.9. Air proofreader of idling
   6.10. Order of a decompression of fuel system
   6.11. Check of pressure of fuel
   6.12. The fuel pump, the pump of pumping and the fuel level sensor in a tank
   6.13. Fuel pipes and union
   6.14. Fuel tank
   6.15. Air filter
   6.16. Cable of the drive of a butterfly valve
   6.17. Carburetor
+ 7. Exhaust system
+ 8. Transmissions
+ 9. Coupling
+ 10. Brake system
+ 11. Running gear
+ 12. Body
+ 13. Electric equipment
+ 14. Useful tips


6.3. Check of system of injection

1. Check reliability of all connections with weight. Check conducting and sockets of system. Weakening of electric connections and bad contact with weight can be the cause of many malfunctions which are observed as serious refusals.
2. Check degree of state of charge of the battery. Normal operation of sensors and actuation mechanisms of a dosage of fuel depends on supply voltage.
3. Check a condition of the air filter.
4. If the fused safety lock is found, then replace it and check work of the corresponding chain. If the safety lock fuses again, then find the wire closed on weight in conducting.
5. Check tightness of the channel of an air duct from the stream measuring instrument to the soaking-up collector. Check a condition of vacuum hoses. The suction of air can become the reason of abnormal operation of the engine.
6. Remove an air duct from the gate case and check existence of resinous deposits and a deposit, clear and wash out an air duct a carburetor cleaner.
7. On the working engine apply a stethoscope (or the screw-driver) to each of nozzles and listen to the characteristic clicks indicating normal work of nozzles.
8. Check fuel pressure in the highway.
9. If abnormal operation of the engine is observed, and the specified checks do not yield result, then address to service of car service for reading of codes of refusals which are brought in memory of the control unit.