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
+ 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
   Sequence of search of malfunctions
   Visual check
   Cause of failure — the electrical system
   Cause of failure — system of ignition
   Cause of failure — a fuel supply system
+ Specifications

Sequence of search of malfunctions

Whether the starter works

If the starter does not join or turned badly, read further the section "Cause of Failure — the Electrical System". If it, on the contrary, surely scrolled the engine, it is necessary to answer in turn the following questions further to narrow a search circle.

Whether give a spark plug spark?

To disconnect a wire tip from one of spark plugs, to turn out a candle, to insert into a tip. Now to connect a candle by means of an auxiliary cable for "lighter" to the block of cylinders (on an illustration the auxiliary cable is not represented for the best presentation). To ask the assistant to turn a starter. Do not touch a high-voltage wire and a spark plug – it is dangerous! Whether sparks are visible? If yes, pass to clarification of the following question. If is not present, read further the section "Cause of Failure — System of Ignition".

Whether fuel comes to system of injection?

To disconnect the giving fuel-supply line from the union in a motor compartment. Carefully: models to the 5-cylinder engine can have an emission of rather large amount of fuel under a high pressure. Therefore when weakening connection put a thick rag on the union. It is possible to extend the giving fuel-supply line by means of a hose and to lower its end in any capacity. Ask the assistant to turn a starter shortly.

If gasoline moves, the fuel pump has to work. If is not present, read further the section Cause of failure — a fuel supply system. If gasoline moves, as a source of malfunctions there is only a system of injection. Or the fuel pump though works, but does not give the necessary pressure.

(The top illustration shows check of a fuel supply system of the engine with a power of 66 kW, on the lower illustration the 6-cylinder engine is represented).