Audi 80/90/Coupe

since 1986-1991 release

Repair and operation of the car

Audi 80/90/Coupe
+ 1.2. Identification of the car
- 2. Engines, carburetors
   2.1.2. Removal and installation of the engine (5-cylinder models)
   2.1.3. Dismantling and assembly of engines
   2.1.4. Head of the block of cylinders, gas distribution mechanism
   + 2.2. Engine electric equipment
   - 2.3. Carburetors
      - Check and adjustment of the carburetor Check of turns of idling Check and adjustment of maintenance of CO Bystry check of functioning of the carburetor Check of the probe Lambda Check of the sensor of temperature of cooling liquid Check of an air diaphragm Check of a potentiometer of a throttle Preset values of the carburetor 2EE
      + 2.3.2. Keihin carburetors
3. Lubrication system
+ 4. Cooling system
+ 5. Fuel system
+ 6. Exhaust system
+ 7. System of ignition
+ 8. Transmission
+ 9. Suspension brackets, wheels
+ 10. Brake system
+ 11. Steering
+ 12. Body, salon
+ 13. Air conditioning system
+ 14. Electric equipment Check of an air diaphragm


Measurement of resistance of the regulator

The air diaphragm regulates proportions of fuel and air in the mix which is soaked up in the carburetor during launch of the cold engine in a phase of heating of the engine and acceleration during driving with the cold engine. The regulator of provision of an air diaphragm moves it through system of levers. In essence, it is the small electric motor operated by impulses from the equipment of management, providing bystry and exact change of provision of a diaphragm.

Along with the help of the lever placed on the other side of a diaphragm axis the section of the jet correcting turns of idling of the engine changes.


1) warm the engine up to the temperature of 60 °C
2) kill the engine
3) remove the air filter
4) moving a diaphragm, check whether very big resistance in the place of its laying appears
5) start the engine and leave it to idle
6) watch a diaphragm and at the same time add gas, rotating the lever on about 1/3 turns between the provision of idling and full opening of a throttle
7) the diaphragm has to bend sharply towards situation "course is closed", and then return to a starting position.
8) if the diaphragm does not change the situation, it is necessary to check resistance of the regulator of provision of a diaphragm
9) disconnect a plug from the regulator of provision of a diaphragm
10) measure by an ohmmeter resistance between the terminations of the regulator, its size has to equal 0.9–1.7 Ohms
11) measure resistance between each termination and weight whether there was no short circuit.
12) if the diaphragm regulator normal, it is necessary to check a throttle potentiometer
13) kill the engine
14) connect the disunited electrical wiring elements
15) install the case of the air filter