Audi 80/Avant (B4)

since 1991-1995 of release

Repair and car operation



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
- Injection system
   + System of injection of Mono-Motronic
   - System of injection of Digifant
      Operating procedure
      Malfunctions and independent diagnostics
      Independent repair
      Visual check
      Check of separate elements
      Removal of vpryskny nozzles
      Check of a mode of idling and analysis of exhaust gases
      List of malfunctions
   + System of injection of KE-III-Jetronic
   + 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 electrosystem
+ ignition System
+ Lighting
+ Signalling devices
+ Devices and auxiliary devices
+ Heating and ventilation
+ body Elements
+ Search of malfunctions
+ Specifications





List of malfunctions

System of injection of Digifant

 Malfunction
Its reason
Than to help
And. The cold engine is not got absolutely or very badly 1. Faulty safety lock 13, 21, 25, 27 or 28
2. Faulty relay of a food
3. The fuel pump does not deliver fuel absolutely or very badly
4. The starting valve does not inject fuel or is not tight
5. Faulty regulator of pressure of fuel
6. The faulty sensor of temperature of cooling liquid
7. Faulty potentiometer of a butterfly valve
8. Faulty control unit
9. The plait of wires between the sensor of the Hall and the control unit is damaged
9. In the engine "unrecorded" air arrives
To replace

To check, if necessary to replace
Whether there is in general a gasoline in a fuel tank?

To check the pump, to measure amount of delivered fuel
To check the starting valve

In a workshop to measure pressure

To check in a workshop

To check in a workshop
To check cable passing

To check all pipelines

Century. The heated-up engine is not got absolutely or got badly 1. The vacuum hose conducting to a regulator of pressure of supply of fuel is damaged
2. See. And 2-9
3. Vpryskny nozzles are not tight
To check the pipeline


To check nozzles

S.Dvigatel is got, but again глохнет 1. The stabilization valve in an idling mode does not work
2. See А7
To check the valve

To check functioning, if necessary to replace

D. The cold engine shivers in an idling mode 1. See. And 6
2. See. With 1
3. The control unit by an automatic transmission and a potentiometer of a butterfly valve are not coordinated with each other (only after replacement of details)
To carry out in a workshop coordination
Е. The heated-up engine shivers in an idling mode See С1  
F. Turns of idling decrease at complete turn of the steering mechanism See С1  
G. The engine works with interruptions 1. The fuel filter is hammered
2. See А3
3. See В3
4. See С4
To replace the filter
N. Fluctuating frequency of rotation at 2000-3000 rpm See А7  
I. The engine works with interruptions, глохнет See А3  
J. Insufficient engine capacity 1. See А3, 7 and 10
2. See С3
4. Butterfly valves do not rise in the provision of full "gas"
To adjust a hummock drive of gas
To. Return flashes in an inlet collector See А5  
L. Too high fuel consumption See А6 and 7