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 of Mono-Motronic
   + System of injection of Digifant
   + System of injection of KE-III-Jetronic
   - Systems of injection of MPI and MPFI
      Operating procedure
      Lambda regulation
      Malfunctions and independent diagnostics
      Independent repair
      Visual check
      Check of separate elements
      Removal of elements
      Hummock drive of "gas"
      Check of the mode of idling and analysis of exhaust gases
      List of malfunctions
+ 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
+ Signalling devices
+ Devices and auxiliary devices
+ Heating and ventilation
+ body Elements
+ Search of malfunctions
+ Specifications

List of malfunctions

Systems of injection of MPI/MPFI

Its reason
Than to help
A. The cold engine is not started absolutely or very badly 1. Faulty safety lock 13, 21, 27, 28 or 32
2. Faulty relay of the fuel pump
3. The fuel pump does not give fuel absolutely or very badly
4. Faulty regulator of pressure of fuel
5. Faulty valve of idling
6. Faulty control unit
7. There is no rotation frequency signal from the rotation frequency sensor
8. Unaccounted air comes to the engine
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 the given fuel (The head the Fuel tank and the fuel pump)
To measure pressure in a workshop
To check
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 pipeline conducting to the fuel supply pressure regulator is faulty
2. See. And 1 - 4, 6 and 7
3. Vpryskny nozzles are not tight
4. Faulty sensor of temperature of cooling liquid
To check the pipeline
To check nozzles
To check the sensor
C. The engine is started, but again becomes deaf 1. See. And 1 and 5
2. See B1
3. The indicator WITH differs from the standard
4. A faulty flowmeter of air (MPI) or the sensor of temperature of inlet air or the sensor of pressure in a final collector (MPFI)
5. Faulty potentiometer of a butterfly valve
To check system of injection
To check
To check
D. The cold engine shivers in the idling mode 1. See. And 5  
E. The heated-up engine shivers in the idling mode 1. See. And 4 and 5
2. See C3
F. Too high turns of idling See. And 5  
G. The engine works with interruptions 1. The fuel filter is hammered
2. See A3 and 5
3. See B34 See C3 and 4
To replace the filter
H. The engine works with interruptions, becomes deaf The fuel pump works unevenly To check productivity of the fuel pump
I. Insufficient engine capacity 1. See A3, 4 and 8
2. See C3 and 5
3. Butterfly valves do not rise in the provision of full "gas"
To adjust the hummock drive of "gas"
J. Backfires in a final collector 1. See A4
2. See C3
K. Too high fuel consumption 1. See B4
2. See C3