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
      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 of Digifant
   + 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 electrical system
+ System of ignition
+ Lighting
+ Signalling devices
+ Devices and auxiliary devices
+ Heating and ventilation
+ body Elements
+ Search of malfunctions
+ Specifications

Visual check

Leakage in the field of system of an admission opens access to unaccounted air, that is air which is not considered at calculations of the control unit and therefore significantly disturbs mix preparation. Mix is nekontrolirovanno impoverished. Most distinctly this malfunction is shown in the unstable frequency of rotation in the idling mode. But the same malfunction can be shown in the ringing noise of the engine working at full loading.


  1. To check density of a prileganiye of vacuum hoses and existence of cracks. All hoses on the block of preparation of gas mixture or an inlet collector (for example, the amplifier of brakes, preliminary heating of the arriving air, system of evaporation of fuel) have to be checked.
  2. To warm up the engine and to leave it to work at single turns, to open a cowl.
  3. To sprinkle from the spray containing fuel spray (for example "Startpilot") the block of preparation of gas mixture about a flange to a final collector, consolidations of flanges of inlet channels and pipelines to the units operated by depression (at the disconnected plug to a lambda probe).
  4. If the frequency of rotation of the engine changes when spraying a certain place, so there not hermetically.
  5. Whether it is possible to distinguish leakage of a fuel-supply line? Whether tips of a wire
  6. were repeatedly disconnected and are again connected? Corrosion or inept actions can lead to unreliable contact.
  7. Attentively consider plugs of separate elements of system of injection. Not to bend contacts but only to process spray.