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

Visual check

Leakage in the field of system of an admission opens access to "unaccounted" air, that is air which is not considered at the monitor and therefore significantly prevents mix preparation. Mix is nekontrolirovanno impoverished. Most distinctly this malfunction is shown in the unstable frequency of rotation when idling.


  1. To check density of a prileganiye of vacuum hoses and existence of cracks. All hoses on an inlet collector (for example the amplifier of brakes, preliminary heating of inlet air, the electromagnetic valve of 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 cover.
  3. To sprinkle from the spray containing fuel spray (for example, "Startpilot") the case of throttle knot, consolidation of flanges of inlet channels and pipelines to the units operated by depression (to disconnect plug connection from a lambda probe).
  4. If when spraying a certain place the frequency of rotation of the engine changes, so there was a leakage.
  5. Whether it is possible to distinguish leakage of a fuel-supply line? Whether tips of wires
  6. were repeatedly disconnected and again are connected? Corrosion or inept actions can lead to insufficient contact.
  7. Attentively consider plugs of separate components of system of injection. Not to bend contacts, and to process spray.