Audi A4

since 1994 of release

Repair and car operation

A4 Audi
+ Running gear
+ Regular servicing
+ Engines
+ Turbo-supercharging
+ exhaust System
+ cooling System
+ Fuel tank and fuel pump
+ Air filter and absorption channels
- Injection system
   - System of injection of Motronic
      The major knots
      So the system of injection of Motronic functions
      Violations in work and self-diagnostics
      The self-help at injection
      Visual control
      Search of malfunctions in separate knots
      Check of idling and exhaust gases
      Check of exhaust gases (AU)
      Butterfly valve cable
      The help at malfunctions
   + System of injection of MPI and MPFI
+ Coupling
+ Transmission and main transfer
+ Suspension bracket of wheels and steering
+ Brakes
+ Wheels and tires
+ Electrotechnical equipment
+ ignition System
+ Lighting
+ Alarm equipment
+ Tools and devices
+ Heating and ventilation
+ body Details
+ Salon
Search of malfunctions
Technical characteristics

Visual control

  • not tight sites on gasoline pipe lines are appreciable?
  • You disconnected and then connected several times sockets of wires? Corrosion or the nonprofessional address can damage contacts.
  • Attentively examine sockets of separate knots of system of injection. Do not bend contacts, only process them spray for contacts.
  • At violations in operation of the engine in a range of idling check, whether soaks up the engine additional air.

Search of a place of receipt of «additional air»

Not tight sites of system of absorption of air pass so-called additional air, i.e. air which does not enter into control unit calculation and consequently noticeably breaks process of preparation of a fuel and working mix. In a working mix the amount of fuel uncontrollable decreases. Violation idling is more appreciable by fluctuation of number of turns than all this.


  1. Check on existence of cracks vacuum hoses and durability of their fastening. Check all hoses connected to an inlet collector (for example, from the brake amplifier, from a regulator of pressure of fuel, the electromagnetic valve of system, collecting/return system паров fuels).
  2. Warm up the engine, then, having left it to idle, open a cowl.
  3. Water from the spray of starting fuel (for example, «Startpilot») a branch pipe of a butterfly valve, laying of flanges, inlet channels and pipelines to the units operated by means of lowered pressure. For this purpose disconnect the socket a lambda probe.
  4. If at a sbryzgivaniye of a certain place the number of turns changes, not tight site is found.