Audi 80/Avant (B4)

since 1991-1995 of release

Repair and car operation



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
   Removal of a replaceable element of the air filter
   Purge of a replaceable element of the air filter
   Replacement of a replaceable element of the air filter
   Heating of inlet air
   Heating of an inlet collector
   Inlet collector with changeable length of a path
+ injection System
+ Coupling
+ Transmission and transmission
+ Suspension bracket and steering
+ Brake system
+ Anti-blocking system of brakes
+ Wheels and tires
+ Body electrosystem
+ ignition System
+ Lighting
+ Signalling devices
+ Devices and auxiliary devices
+ Heating and ventilation
+ body Elements
+ Search of malfunctions
+ Specifications





Heating of an inlet collector

Models with 4-цил. engines and Mono-Motronic system

From the block of preparation of gas mixture of Mono-Motronic system the air and fuel mix through an inlet collector gets to cylinders.

If the inlet collector cold, a considerable part of a mix is condensed on internal walls of a collector and gets to combustion chambers any more absolutely in a look паров. So losses and, thereby, the increased fuel consumption are formed. This misfortune can be helped double heating of an inlet collector.

  • On the cold engine action is entered by electric heating of an inlet collector. It consists of electricly warmed-up "hedgehog" who is screwed in in an inlet collector below the block of preparation of gas mixture. At our "hedgehog" with a natural small animal the general only needles. They serve in Audi 80 not so much to passive self-defense, how many increase in a surface of a heating element. Such "echinoid" heating operates only approximately to temperature of cooling liquid 65°C. Then the current is disconnected.
  • The thermoswitch (on electric circuits the sensor of temperature of cooling liquid is designated as «–G62») includes "hedgehog" not directly. G62 supplies the Mono-Motronic control unit with information on temperature more likely, and this the last via the relay in the additional block of the relay under the dashboard makes the order to submit a food to "hedgehog".
  • At more high temperatures heating of an inlet collector is assumed by cooling liquid. For this purpose via the special channel in an inlet collector the additional quantity from the general stream of cooling liquid goes.

Check of heating of an inlet collector

 PERFORMANCE ORDER

  1. Check of "hedgehog": on the cold engine to disconnect a wire conducting to "hedgehog" under an inlet collector, on plug connection (it is established sideways on the block of preparation of gas mixture).
  2. On a cable to "hedgehog" and to "weight" to connect an ohmmeter: if it shows 0,25 – 0,50 Ohm, that, means, "hedgehog" as it should be.
  3. Who has no ohmmeter, that should remove the block of preparation of gas mixture at the cold engine, include ignition and check a wet finger, whether needles of "hedgehog" heat up.
  4. If "hedgehog" is not heated, despite true indicators of resistance, the reason can be in the defective relay.
  5. Thermoswitch check: (see the section System of injection of Mono-Motronic).
  6. Relay check – see head Body electrosystem.

The case of the filter of the engine in capacity of 66 kW with system of injection of Mono-Motronic:

1–intake of warm air;
2–intake of cold air;
3–membrane mechanism;
4–draft of a drive of an air zaslonka;
5–temperature regulator.

"Hedgehog" (3) in an inlet collector (4) with a connecting wire (5).