Audi 80/Avant (B4)

since 1991-1995 release

Repair and operation of the car

Audi 80/Avant
+ Technical specification
+ Engines
+ System of production of the fulfilled gases
+ Cooling system
+ Fuel tank and fuel pump
+ Air filter and airintaking channels
- System of injection
   + System of injection Mono-Motronic
   + System of injection Digifant
   - System of injection KE-III-Jetronic
      Basic elements
      Operating procedure
      Lambda regulation
      Malfunctions and independent diagnostics
      Independent repair
      Visual check
      Check of separate elements
      Search of malfunctions
      Removal of components
      Check of the mode of idling and analysis of exhaust gases
      List of malfunctions
   + Systems of injection of MPI and MPFI
+ Coupling
+ Transmission and transmission
+ Suspension bracket and steering
+ Brake system
+ Anti-blocking system of brakes
+ Wheels and tires
+ Body electrical system
+ System of ignition
+ Lighting
+ Signaling devices
+ Devices and auxiliary devices
+ Heating and ventilation
+ Body elements
+ Search of malfunctions
+ Specifications

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Check of the mode of idling and analysis of exhaust gases

The Audi 80 car with the 5-cylinder engine is supplied with automatic control of frequency of idling. The adjusting bolt is absent – so there is even nothing to regulate. If rotation frequency in the mode of idling gets off, it is just checked. In the correct conditions of check (about it below) the following indicator of frequency of rotation of 720 - 860 rpm has to be established.

If you received other sizes:


  1. To check all parts of inlet system (the pipeline, sealing laying) for tightness. The getting unaccounted air can change so strongly rotation frequency in the idling mode that even the distributive valve of stabilization of idling will not be able to establish it.
  2. To interview memory of the store of malfunctions in a workshop. Perhaps, in system there is other malfunction.

Check conditions


  1. Conditions of check of frequency of rotation in the mode of idling are correctly adjusted ignition, the engine which is warmed up up to the working temperature and also serviceable systems of injection and ignition.
  2. Further it is necessary to disconnect everything consumers of electric current in the car.
  3. The cooling system fan should not work.
  4. To remove the ventilating pipeline of a case below the distributor, to muffle a tube to an inlet collector (the cap of an intaking tubule of carbon monoxide approaches).
  5. To extend the oil measuring probe and to close a rag an opening of the directing tube.
  6. It is dense to close a hose from the case of a butterfly valve to the valve of system of evaporation of fuel above on a thick sleeve of an air inlet a clip or passatizha.

Analysis of exhaust gases

In house conditions an inspection of contents WITH usually is not carried out as this procedure is obligatory when passing annual checkup. Besides, the special device is for this purpose necessary.

In a workshop also current in pressure regulator chain because pressure regulator, as well as the idling stabilization valve, has to be within the main control in the middle of standard range is measured in addition. If it not so, then it means that, despite a standard indicator WITH, in system of injection there is a malfunction (in most cases – leakage as it was already mentioned).

It is necessary to check in the same conditions, as at idling regulation.


  1. To connect the device for measurement WITH to a special tube ahead in a motor compartment. To watch a dense prileganiye.
  2. To disconnect shtekerny connection to a lambda probe.
  3. To start the engine and to leave to work in the idling mode.
  4. The test for contents WITH in the fulfilled gases has to show 0,1 — 1,1% WITH.
  5. If necessary to adjust WITH the adjusting screw.
  6. To remove a cap over the adjusting screw as follows: to drill an opening with a diameter of 2,5 mm in a cap. To screw there the self-cutting screw of 3 mm and to pull out a cap nippers.

     Important: when the adjusting key is put to an adjusting bolt, it is impossible to press an accelerator pedal at all. The key always should be taken out.

  7. After each process of adjustment for a while to squeeze out an accelerator pedal before reading out an indicator WITH.

 Hint: everything that you have to know about the test for toxicity of the fulfilled gases, check of effect of catalytic converter, check a lambda probe and the hummock drive of "gas", you will find in the head "System of injection Mono-Motronic".