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
   Various systems of ignition
   Principle of work of ignition
   Executive body
   System "brain"
   Impulses for the control unit
   Regulation on a detonation
   Security measures during the work with system of ignition
   Repair of system of ignition
   Diagnostics of system of ignition
   Ignition distributor
   Sensor of detonation combustion
   Elements of high voltage
   Replacement of spark plugs
   Spark plugs
   Check of the moment of ignition
+ Lighting
+ Signaling devices
+ Devices and auxiliary devices
+ Heating and ventilation
+ Body elements
+ Search of malfunctions
+ Specifications





Various systems of ignition

The system of ignition is almost in all Audi 80 models a component of electronic system of the engine. But what on paper looks difficult, actually is rather simple: at models with 4-and 6-cylinder engines the system of ignition is run by the same control unit, as system of injection. It has that advantage that reactions of both systems can be optimum coordinated with each other. Besides, the same sensors can be attracted to formation of mix and regulation of the moment of ignition (as it was already described). On various Audi 80 models the following systems of ignition are installed:

  • System of ignition Mono-Motronic for the 66 kW engine. Already at this simplest version of the engine regulation of the moment of ignition, that is coordination of the moment of ignition with the corresponding operational situation, is made only by electronics.
  • The system of ignition Digifant is installed on the 85 kW engines. The principle of action same, as well as at the Molo-Motronic system: in total in one control unit, regulation of the moment of ignition is carried out by electronics.
  • Completely electronic system of ignition (VEZ) is installed on the 98 kW 5-cylinder engine. This system of ignition though is supplied with own control unit, however systems of ignition and injection are with each other in constant data exchange. Regulation of the moment of ignition is carried out by electronics.
  • Systems of ignition of MPI or MPFI of 6-cylinder engines are also an engine electrical system component. Feature: these systems carry out ignition without distributor. Respectively, on everyone two located the friend opposite to the friend of the cylinder one coil of ignition which makes a spark only if it is necessary for one of cylinders is necessary. For technical reasons (economy of details) each cylinder receives at each turn of the engine one more (unnecessary, but also not harming) a spark in a release step.

 Hint: as it was already mentioned, various systems of ignition have many common features. Systems of ignition of 4-and 5-cylinder engines are almost identical. For example, at these systems the high-voltage element in which the spark is created is almost identical. Serious distinctions exist only with systems of ignition of 6-cylinder engines.








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