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
      Operating procedure
      Malfunctions and independent diagnostics
      Independent repair
      Visual check
      Check of separate elements
      Check of the mode of idling and analysis of exhaust gases
      Check of catalytic converter and lambda probe
      Hummock drive of "gas"
      List of malfunctions
   + System of injection Digifant
   + 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 Mono-Motronic

If you have no opportunity to consider memory of the store of malfunctions the device in the workshop Audi, you can try to find malfunction by means of our table of malfunctions.

Its reason
A. The cold engine is not started absolutely or very badly 1. Faulty safety lock 13, 21, 25, 27 or 28
2. Faulty conducting of the additional resistor of a vpryskny nozzle
3. The fuel pump does not deliver fuel absolutely or very badly
4. Faulty regulator of pressure of fuel
5. The faulty sensor of temperature of the cooling means
6. Faulty potentiometer of a butterfly valve
7. Faulty control unit
8. A faulty plait of wires between Hall's sensor and the control unit
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 measure pressure (in a workshop)

To check in a workshop

To check in a workshop
To check passing of a cable
To check according to the instruction about visual check

B. The heated-up engine is not started absolutely or started badly 1. See. And 2 – 9
2. The vpryskny nozzle is untight
To check a nozzle
C. The engine is started, but again becomes deaf 1. The regulator of provision of a butterfly valve does not work
2. See A6
3. Defective lambda probe
To check the regulator

To check functioning, if necessary to replace

D. The cold engine shivers in the idling mode 1. See. And 5
2. See. With 1
E. The warm engine shivers in the idling mode See C1  
F. Turns of idling decrease at inclusion of strong consumers of power supply or at full turn of the amplifier of the steering mechanism See C1  
G. The engine works with interruptions 1. The fuel filter is hammered
2. See A3
3. See B2
4. See C3
To replace the filter
H. The fluctuating rotation frequency at 2000-3000 rpm See A6  
I. The engine works with interruptions, becomes deaf Cm. A3  
J. Insufficient engine capacity 1. See A3, 6 and 9
2. See C3
4. The butterfly valve does not rise in the provision of full gas
K. Backfires in an inlet collector 1. See A4
2. See C3
L. Too high fuel consumption 1. See A5 and 6
2. See C3

 Hint: at shutdown of the accumulator adjustment indicators of system of injection of Mono-Motronic are erased. It leads to the fact that after restoration of food the engine works in the mode of idling not faultlessly for some time. Most quicker process of self-restoration of adjustment indicators happens during a trip lasting about 10 min.