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
+ 7. Exhaust system
+ 8. Transmissions
+ 9. Coupling
+ 10. Brake system
+ 11. Running gear
+ 12. Body
+ 13. Electric equipment
- 14. Useful tips
   14.2. The changed numbers
   14.3. Purchase of the old car or mysterious set of figures and letters
   14.4. Durability of the car
   14.5. About parallelism of bridges of the car and trailer
   14.6. Preparation of the car for winter
   14.7. Rule 35
   14.8. Choice of the used car
   14.9. Engine oils
   14:10. What needs to be known, changing oil
   14:11. Emergence in deposit oil
   14:12. Whether it is possible to mix import oils?
   14:13. "Eats" much, but quietly goes
   14:14. It is rather live, than is dead …
   14:15. It is not got - useful tips
   14:16. Visit to car service
   14:17. A gear belt for the gas distribution mechanism drive
   14:18. Wear of pistons
   14:19. Valves
   14:20. Bearings of engines
   14:21. Pollution of the engine
   14:22. As the conditioner works and what to do if it failed
   14:23. Conditioner: not only "pluses", but also "minuses"
   14:24. Rules of service of the conditioner
   14:25. Antifreeze you should not disturb with antifreeze …
   14:26. What should be known upon purchase of the air filter
   14:27. Engine overheat
   14:28. What should be known to the owner of the car with the injector engine
   14:29. Accumulator
   14:30. Possible malfunctions of the rechargeable battery
   14:31. What to do with the failed generator
   14:32. The belt is guilty, and we blame the generator
   14:33. Catalyst
   14:34. Rub in one - or how to save the catalyst
   14:35. Probuksovochka
   14:36. Features of operation of the brake system
   14:37. Malfunctions of the brake system
   14:38. Brake fluids
   14:39. ABS: natural choice
   14:40. Rims
   14:41. We update rims
   14:42. Scheme of marking of a car tire
   14:43. Metal corrosion
   14:44. Automake-up
   14:45. What creaks?
   14:46. Hatch
   14:47. Safety cushion: troubles or pleasures?
   14:48. We fit well?
   14:49. Anticreeping "immunodeficiency"
   14:50. Why headlights grow dull
   14:51. Galogenka
   14:52. About the correct adjustment of headlights
   14:53. Electric motor
   14:54. From change of the places "composed" nothing changes?


14:28. What should be known to the owner of the car with the injector engine


Injector motors surpass carburetor in many parameters, to take at least their profitability and trouble-free start in a frost. Nevertheless, carburetor under our conditions sometimes are more advantageous. And even some car makers deliver on our market cars with such engines. Everything put – as gasoline which is sold at us.

The injector engine is calculated on high-grade gasoline which at our gas stations you will find not often. Besides, different systems of injection have the specific features, they need to be considered at operation of the car. And in our market there is a lot of such systems: with mechanical injection "To (KE)-Jetronic", electromechanical "L-Jetronic" and electronic – "Motronic", "Lucas", "Marelli".

Many systems have two operating modes: the main and emergency – at malfunction of one of sensors. The driver cannot notice such malfunction: on the dashboard there is no alarm signal, and the engine continues to work (but not in the optimum mode any more). Similar quite often happens in "Audi-80" to the central injection. About a third of the motorists having such cars do not even guess that they go in emergency operation. And it leads to the increased fuel consumption, power deceleration, uneven operation of the engine and the complicated start-up. Malfunction comes to light only during the next servicing. Therefore it is worth dwelling upon the "weak" places of each system which are shown under our conditions.

Systems with mechanical injection. They more than others, are subject to physical wear. The regulator of pressure of fuel fails usually through 80–120 thousand km of a run (start of the engine considerably worsens), nozzles – through 60–80 thousand (uneven operation of the motor, the increased fuel consumption). The refusal of nozzles is especially artful as not at once you will notice it. Diagnosing and repair require the special equipment.

Sore point of systems with electromechanical injection – an air suction through the numerous vacuum hoses tending to cracking after 4–5 years of service. In particular on BMW and, in a little smaller degree, on "Audi". To reveal such defect quite difficult.

At electronic systems – the problems. For example, accumulator "sat down", and you on an old habit decided "to light" from other car. As a result the electronic block fails. And use of ethylated gasoline will be put, in turn, out of commission by a lambda probe and the catalyst.

In general, both mechanical, and electronic systems of injection have the pluses and minuses. At mechanical the thicket is refused by gasoline pumps and batchers distributors. At electronic the gasoline pump is more durable and is cheaper, but any malfunction of the computer will cost much. Besides, we, alas, have more reasons for failure of any system, than in Western Europe or America: low-quality gasoline, dirt on roads and chemicals with which they are strewed. Therefore it is worth listening to recommendations of experts. Try to use import gasoline if there is such opportunity; for removal of moisture from fuel-supply lines during each filling fill in special medicine in a tank; through each 10 000–15 000 km of a run do full washing of system of injection.


One more feature: any failure fixes the computer. And even after replacement of a faulty detail it will issue incorrect commands – until not to erase" failure at the special stand.