Audi 80/Avant (B4)

Audi 80/Avant
The description
System of release of the fulfilled gases
Cooling system
Fuel tank and the fuel pump
The air filter and intake channels
- Injection system
   - System of injection Mono-Motronic
      Operating procedure
      Malfunctions and independent diagnostics
      Independent repair
      Visual check
      Check of separate elements
      Check of a mode of idling and the analysis of exhaust gases
      Check catalytic neutralizer and a ljambda-probe
      Trosovyj drive of "gas"
      The list of malfunctions
    System of injection Digifant
    System of injection KE-III-Jetronic
    Systems of injection MPI and MPFI
Transmission and transmission
Suspension bracket and steering
Brake system
Antiblocking system of brakes
Wheels and tyres
body electrosystem
Ignition system
Signalling devices
Devices and auxiliary devices
Heating and ventilation
Body elements
Search of malfunctions

Visual check

leakage in the field of admission system opens access to not considered air, that is air which is not considered at calculations of the block of management and consequently essentially disturbs to mix preparation. The mix неконтролированно is impoverished. Most clearly this malfunction is shown in unstable frequency of rotation in an idling mode. But the same malfunction can be shown in ringing noise of the engine working on full loading.


  1. To check up density прилегания vacuum hoses and presence of cracks. All hoses on the block of preparation of a gas mixture or an inlet collector (for example, the amplifier of brakes, preliminary heating of arriving air, system of evaporation of fuel) should be checked up.
  2. To warm up the engine and to leave it to work on single turns, to open a cowl.
  3. To sprinkle from a spray containing a fuel spray (for example Startpilot) the block of preparation of a gas mixture about a flange to a final collector, consolidations of flanges of inlet channels and pipelines to the units operated depression (at the disconnected tip to a ljambda-probe).
  4. If frequency of rotation of the engine changes at spraying of a certain place, means, there негерметично.
  5. Whether it is possible to distinguish негерметичность топливопровода?
  6. Whether wire tips have been repeatedly separated and again connected? Corrosion or inept actions can lead to unreliable contact.
  7. Attentively consider tips of separate elements of system of injection. Contacts not to bend but only to process a spray.