Audi A4

since 1994 release

Manual of the car

Audi A4
+ Running gear
+ Regular servicing
+ Engines
+ Turbo-supercharging
+ System of an exhaust
+ Cooling system
+ Fuel tank and fuel pump
+ Air filter and channels of absorption
- System of injection
   + System of injection Motronic
   - System of injection of MPI and MPFI
      Additional functions
      Knots of system of injection
      Functioning
      Adjustment with the help a lambda probe
      Violations in work and self-diagnostics
      Self-help
      Visual control
      Check of knots
      Dismantle of separate details
      Cable of a butterfly valve
      Inlet collector
      Idling adjustment
      Check of exhaust gases
      The help at malfunctions
+ Coupling
+ Transmission and main transfer
+ Suspension bracket of wheels and steering
+ Brakes
+ Wheels and tires
+ Electrotechnical equipment
+ System of ignition
+ Lighting
+ Alarm equipment
+ Tools and devices
+ Heating and ventilation
+ Body details
+ Salon
Search of malfunctions
Technical characteristics

System of injection of MPI and MPFI

Gasoline consumption

Hi-tech Audi engines are helped by electronics a little too "am eager to bridle" the engine. At a walking speed of Audi 8,5 l on 100 km completely can manage. On the other hand, will not make a problem to increase fuel consumption more than to 12 l by 100 km.

Injection

In the six-cylinder engine with a working volume of 2,8 l the system of injection of MPI is installed. Reduction of the English name Multi Point Injection – multipoint injection is behind an abbreviation of MPI. (An identification sign of system of injection of MPI the measuring instrument of a stream of fresh air in an airintaking hose behind on the right in a motive compartment is.)

The system of injection of MPFI fuel of the engine of 2,6 l almost identical to it is called this abbreviation only for difference which is deciphered as Multi Point Fuel Injection – multipoint injection of fuel. (Identification sign: lack of the measuring instrument of a stream of fresh air.)

Distinctive sign of these two systems is the way of measurement of quantity (or masses) the soaked-up air:

MPI does it by means of a termoanemometrichesky wire flowmeter of air.
In MPFI for these purposes the air pressure sensor in an inlet collector is used (it is built in the control unit and it is connected by a hose with an inlet collector), and also the sensor of temperature of the soaked-up air (in an inlet collector).