Audi A4

Since 1994 of release

Repair and car operation



Audi А4
+ Running gear
+ Regular servicing
+ Engines
+ Turbo-supercharging
+ Exhaust system
+ Cooling system
+ Fuel tank and the fuel pump
+ The air filter and channels всасывания
+ Injection system
+ Coupling
+ Transmission and the main transfer
+ Suspension bracket of wheels and steering
+ Brakes
+ Wheels and tyres
+ The electrotechnical equipment
+ Ignition system
+ Illumination
+ The alarm equipment
+ Tools and devices
+ Heating and ventilation
+ Body details
+ Salon
Search of malfunctions
Technical characteristics



Search of malfunctions

In our search of malfunctions we recognise that in the engine there are no mechanical damages. We suppose that the power-plant involuntarily stops or is not got any more.

The starter turns the engine?

If it does not do it or does slowly, read, please, below section «the Source of malfunctions – the electrotechnical equipment». On the contrary, if the engine is quickly got, to narrow a circle of search of malfunctions, you should answer following questions serially.

Spark plugs give a spark?

Remove a candle socket, unscrew a candle, insert into a candle socket. Connect a candle an auxiliary wire to the engine block so that to provide conductivity (in drawing an auxiliary wire has been lowered for the sake of presentation). Do not touch a wire of ignition and to a candle – danger of accident! If yes, clear the following question. If is not present, read further section «the Source of malfunctions – ignition».

Fuel arrives in system of injection?

Disconnect a fuel hose in a place of its screw connection in an impellent compartment (a photo above – the four-cylinder engine with working volume 1,8 l, a photo below – the six-cylinder engine). Be cautious: fuel can scatter. Therefore at hose unscrewing enclose a thick rag under screw connection. Extend submitting топливопровод with a suitable hose and lower in capacity. Let your assistant will turn a starter the engine.

If gasoline arrives, the fuel pump works normally. If is not present, read about this situation further in section «the Source of malfunctions – fuel giving». Then a malfunction source there is a fuel injection. Or the pump works, but creates insufficient pressure.

In the beginning the visual control

  • The wire socket on knots of system of ignition or in knot of system of injection was disconnected?
  • Check up durability of fastening of a wire of ignition on the ignition coil, on the distributor (the engine of 1,6 l of 74 kw) and on sockets of candles (ignition at all do not include!).
  • In an impellent compartment all hoses of the lowered pressure are put on a corresponding branch pipe?
  • Water condensate on a cover of the distributor and in it (only at the engine of 1,6 l of 74 kw)? All details of system of ignition, including the ignition coil, should be pure and dry, otherwise there is a danger of occurrence of creeping currents and pressure breakdowns.
  • Gasoline smell in an impellent compartment? Негерметичен a fuel hose or it in general was disconnected?

Source of malfunctions – the electrotechnical equipment

  • Control bulbs on a control panel do not burn or do not blink at the included ignition: the accumulator was completely discharged or accumulator plugs are disconnected.
  • Control bulbs die away at starter activization: the accumulator was strongly discharged, or has grown old, or short circuit in a starter.
  • Control bulbs at turn of a key grow dull a little, the starter is not turned: the electromagnetic switch gets jammed, or it is faulty, or the starter is faulty.
  • Control bulbs brightly burn or blink at key turn; the starter is not turned: defect of contact of the plug 50 In the ignition lock, was disconnected a wire of the plug 50 electromagnetic switches or the electromagnetic switch is faulty.

Source of malfunctions – ignition

  • All sockets in the field of the coil (coils) of ignition and the ignition distributor (the engine of 1,6 l of 74 kw) are correctly connected?
  • Cracks in the case of the coil of ignition or in cases of coils of ignition, traces of burns from sparks at breakdowns?
  • Only at the engine of 1,6 l capacity of 74 kw: uncover the distributor. Traces of creeping currents on its inside are visible? The graphite brush in the middle of a cover faultlessly springs? Is jar-medjanka on pins of contacts?
  • As last measure full check of system of ignition will help only.

Source of malfunctions – fuel giving

  • There is no gasoline in a fuel tank is not such absurd as you, maybe, will think. In our engines with injection the fuel lack is shown in the beginning in the form of faults in engine work on turns.
  • The fuel pump is faulty.
  • The fuel filter has got littered.
  • At normal giving of fuel – for example, at constant problems with engine start – the suspicion falls on injection system.