S-class W202 Mercedes

1993-2000 of release

Repair and car operation

W202 Mercedes
+ 1.2. General information
+ 2. Maintenance
+ 3. Engines
+ 4. Greasing system
+ 5. Cooling system
+ 6. Heating, ventilation
+ 7. Ignition system
- 8. Fuel system
   + 8.1.1. Introduction
   - 8.2. System of injection of petrol engines Principle of work of PMS Principle of work of HFM
      8.2.2. Self-diagnosing of a condition of system of ignition and fuel injection
      8.2.3. Air flowmeter
      8.2.4. A temperature-sensitive element of cooling liquid
      8.2.5. The sensor of soaked-up air
      8.2.6. System of vacuum pipelines
      8.2.7. The fuel distributor with klapanny nozzles
      8.2.8. Klapannye of a nozzle
      8.2.9. Oxygen sensor (lambda probe)
      8.2.10. Diagnostics of malfunctions of system of injection of gasoline
      8.2.11. That it is necessary to know to the owner of the car with the injector engine
      8.2.12. Turbo doctor
   + 8.3. System of injection and food of diesel engines
   + 8.4. System of production of exhaust gases
+ 9. Transmission
+ 10. Running gear
+ 11. Steering
+ 12. Brake system
+ 13. Body
+ 14. Electric equipment
+ 14.2. Electroschemes

b47c026d b47c026d

8.2.11. That it is necessary to know to the owner of the car with the injector engine


Injector motors surpass carburetor in many parameters, to take at least their profitability and problemless start in a frost. Nevertheless, carburetor under our conditions sometimes appear more advantageous. And even some automakers deliver on our market of the car with such engines. The whole matter is in the quality of gasoline which sell at us.

The injector engine is calculated on high-grade gasoline which on our fillings you will find not often. Besides, different systems of injection have the specific features, they are necessary for considering at car operation. 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 can and not notice such malfunction: on the dashboard there is no alarm signal, and the engine continues to work (but any more in an optimum mode). Similar quite often it happens in "Audi-80" with the central injection. About a third of the motorists having such cars, do not guess at all that go in emergency operation. And it conducts to the increased fuel consumption, decrease in capacity, rough operation of the engine and the complicated start-up. Malfunction comes to light only during the next servicing. Therefore on the "weak" places of each system which are showing under our conditions, it is necessary to dwell.

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

Sore point of systems with electromechanical injection: подсос air 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, the accumulator "sat down", and you on an old habit decided to "light" from other car. The electronic block as a result fails. And application of etilirovanny gasoline will be put, in turn, out of commission by a lambda probe and the catalyst.

As a whole, 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, the reasons for failure of any system at us, alas, more than in Western Europe or America: poor-quality gasoline, dirt on roads and chemicals with which them strew. Therefore it is necessary to listen to recommendations of experts. Try to use import gasoline if there is such possibility; for moisture removal from топливопроводов at each filling fill in in a tank a special preparation; through each 10–15 thousand km of run do complete washing of system of injection.

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