Audi 80/Avant (B4)

Since 1991-1995 of release

Repair and car operation

Audi 80/Avant
+ The description
+ Engines
+ System of release of the fulfilled gases
+ Cooling system
+ Fuel tank and the fuel pump
+ The air filter and воздухозаборные channels
- Injection system
   + System of injection Mono-Motronic
   + System of injection Digifant
   + System of injection KE-III-Jetronic
   - Systems of injection MPI and MPFI
      Operating procedure
      Malfunctions and independent diagnostics
      Independent repair
      Visual check
      Check of separate elements
      Removal of elements
      Trosovyj drive of "gas"
      Check of a mode of idling and the analysis of exhaust gases
      The list of malfunctions
+ Coupling
+ Transmission and transmission
+ Suspension bracket and steering
+ Brake system
+ Antiblocking system of brakes
+ Wheels and tyres
+ Kuzovnaja electrosystem
+ Ignition system
+ Illumination
+ Signalling devices
+ Devices and auxiliary devices
+ Heating and ventilation
+ Body elements
+ Search of malfunctions
+ Specifications


Check of a mode of idling and the analysis of exhaust gases

6-cylinder engines are supplied by automatic control of frequency of rotation of a shaft of the engine in an idling mode.

The adjusting bolt is absent – so even there is nothing to regulate. Frequency of rotation in an idling mode simply check. In correct conditions of check (about it more low) the following indicator of frequency of rotation 680 – 820 rpm (the 2,6-litre engine) or 700 – 800 rpm (the 2,8-litre engine) should be established. Otherwise:


    To check up all elements of inlet system (the pipeline, sealing linings) on tightness. Getting not considered air can so strongly to change frequency of rotation in an idling mode that the distributive valve of stabilisation of idling cannot compensate it even. To interrogate in a workshop memory of the store of malfunctions. Probably, in system there is other malfunction.

Check conditions


    Conditions of check of frequency of rotation in an idling mode are engine temperature, разогретого to working temperature, and also serviceable systems of injection and ignition. Further it is necessary to disconnect in the car all consumers of an electricity. The fan of system of cooling also should not work. To remove both ventilating pipelines картера, to muffle the ends of hoses. To switch off the conditioner. To establish the handle of switching of an automatic transmission in position N or Р. To warm up to working temperature the engine (temperature of oil a minimum 60С). The replaceable element of the air filter should be in faultlessly pure condition. For the analysis WITH the exhaust device should not be connected to release system.

The analysis of the fulfilled gases

In house conditions check of the maintenance WITH usually is not spent, as this procedure is obligatory at passage of annual checkup. Besides, the special device is for this purpose necessary.

It is checked only after system of injection by means of the device of reading of the store V. A. G. 1551 it will be resulted in a so-called substantive provision. That means switching-off of certain adjusting functions (for example, ljambda-regulation) for reception of reasonable comparable sizes.


    To connect the device for measurement of toxicity of the fulfilled gases to the right measuring tube ahead in a motor compartment. To watch for dense прилеганием. To get the engine and to leave to work on single turns. The measuring device should show 0,15 – 1,0 % CO (the 2,6-litre engine) or 0,3 – 1,2 % WITH (the 2,8-litre engine). At models with the 2,8-litre engine the maintenance WITH can be adjusted by means of the adjusting screw at air flowmeter. At models with 2,6-litre the engine regulation possibility is absent. If measurement has shown other maintenance WITH, it is necessary to search for the reason by means of the store of malfunctions.

The indicator WITH differs from the standard

Basically at different indicators WITH it is necessary to search for not tight places in system of giving of air and release of the fulfilled gases. Further it is necessary to establish that the ignition system (the faulty spark plug raises the maintenance WITH on 1,5 %) is perfectly in order.

Too high indicator WITH:

    To check up впрыскные atomizers. Too a fuel high pressure. The gauge of temperature of a cooling liquid is faulty.

Too low indicator WITH:

    Not considered air gets to system of giving of air.

 The help: everything that you should know about the test for the maintenance WITH, action check каталитического neutralizer, check of a ljambda-probe and тросовом "a gas" drive, you will find in the head System of injection Mono-Motronic.

Switching-off of the storage battery erases correction factor of frequency of rotation of a shaft of the engine in a mode of idling of system of injection. Therefore the system should steal up slowly anew to a correct indicator of frequency of rotation, and this process lasts some minutes. So do not run at once into a panic if after replacement of the storage battery the car suddenly works not absolutely faultlessly, it is necessary to pass simply a little, regulation yet will not come to the end.