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
      Operating procedure
      Malfunctions and independent diagnostics
      Independent repair
      Visual check
      Check of separate elements
      Removal of vpryskny nozzles
      Check of the mode of idling and analysis of exhaust gases
      List of malfunctions
   + System of injection 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 electrical system
+ System of ignition
+ Lighting
+ Signaling devices
+ Devices and auxiliary devices
+ Heating and ventilation
+ Body elements
+ Search of malfunctions
+ Specifications





List of malfunctions

System of injection Digifant

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

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

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

To measure pressure in a workshop

To check in a workshop

To check in a workshop
To check passing of a cable

To check all pipelines

B. The heated-up engine is not started absolutely or started badly 1. The vacuum hose conducting to the fuel supply pressure regulator is damaged
2. See. And 2 – 9
3. Vpryskny nozzles are untight
To check the pipeline


To check nozzles

C. The engine is started, but again becomes deaf 1. The stabilization valve does not work in the idling mode
2. See A7
To check the valve

To check functioning, if necessary to replace

D. The cold engine shivers in the idling mode 1. See. And 6
2. See. With 1
3. The control unit of the automatic transmission and a potentiometer of a butterfly valve are not coordinated with each other (only after replacement of details)
To carry out coordination in a workshop
E. The heated-up engine shivers in the idling mode See C1  
F. Turns of idling decrease at full turn of the steering mechanism See C1  
G. The engine works with interruptions 1. The fuel filter is hammered
2. See A3
3. See B3
4. See C4
To replace the filter
H. The fluctuating rotation frequency at 2000-3000 rpm See A7  
I. The engine works with interruptions, becomes deaf See A3  
J. Insufficient engine capacity 1. See A3, 7 and 10
2. See C3
4. Butterfly valves do not rise in the provision of full "gas"
To adjust the hummock drive of gas
K. Backfires in an inlet collector See A5  
L. Too high fuel consumption See A6 and 7  







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