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
+ Coupling
+ Transmission and main transfer
+ Suspension bracket of wheels and steering
+ Brakes
+ Wheels and tires
+ Electrotechnical equipment
- System of ignition
   What provides ignition
   When there is an ignition of fuel-air mix?
   Different systems of ignition
   So there is an ignition spark
   Executive body
   System brain
   The signals coming to the control unit
   Adjustment of a detonation
   Be careful in the address with ignition
   Works on system of ignition
   Search of malfunctions in ignition
   Ignition distributor
   Knot of high voltage
   Replacement of spark plugs
   Right choice of spark plugs
   Check of the moment of ignition
+ Lighting
+ Alarm equipment
+ Tools and devices
+ Heating and ventilation
+ Body details
+ Salon
Search of malfunctions
Technical characteristics


So there is an ignition spark

  • The basic principle of ignition is that in the beginning current of the accumulator passes through primary winding of the coil of ignition.
  • This winding consists of several rounds of a thick wire. Under the influence of current around the ferromagnetic core of the coil of ignition powerful magnetic field – energy of ignition is formed.
  • That there was an ignition spark, accumulator tension on the ignition coil is disconnected. It occurs at the command of the control unit on the so-called "output cascade".
  • With switching off of current magnetic field in the ignition coil disappears. There is a following:
  • In the secondary winding consisting of numerous rounds of very thin wire there is an impulse of a high-tension current in several tens of thousands of volts.
  • This tension goes to that spark plug which just is in line in an ignition order. Fuel-air mix ignites, the engine continues to work. The electric chain becomes isolated again, and the new cycle begins.