Audi A4

since 1994 of release

Repair and car operation

A4 Audi
+ Running gear
+ Regular servicing
- Engines
   Capacity steps
   Engine signs
   Technology of the engine, maintenance and repair
   Greasing system
   Exhaust ventilation of a case
   Visual control of the engine
   Engine service life
   Nominal and maximum frequency of turns
   Restriction of number of turns
   Measurement of pressure of compression
   The help at malfunctions
   Works on a gear belt
   The help at malfunction
   Installation and dismantle of a head of the block of cylinders
   Installation and engine dismantle
+ Turbo-supercharging
+ exhaust System
+ cooling System
+ Fuel tank and fuel pump
+ Air filter and absorption channels
+ injection System
+ 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

Measurement of pressure of compression

For measurement it is necessary to warm up the engine. Tightness of piston rings increases, when oil is hotter. Besides, it is necessary to stop supply of fuel in cylinders. Otherwise at pressure measurement the engine will be filled in with fuel that can damage the catalytic converter. And, at last, it is necessary to switch off ignition, without the connected candles the ignition coil can be damaged at engine start.

At the left: measurement of pressure of compression by the inexpensive measuring device for fans.

On the right: in order that at measurement of pressure of compression fuel was not injected in cylinders, on all valves of injection (arrow) sockets act in film.


  1. Switch off ignition and stop supply of fuel. In different models it becomes differently:
  2. Four-cylinder the engine with working volume of 1,6 l: disconnect the socket of a terminal exit of capacity of the coil of ignition.
  3. Disconnect sockets of all four valves of injection.
  4. The four-cylinder engine with working volume of 1,8 l: coils of ignition are dismantled in any case (head ignition System), sockets on coils of ignition or a terminal exit are thus disconnected also. Disconnect sockets of all four valves of injection.
  5. Six-cylinder engine: disconnect both sockets on a final exit of capacity of coils of ignition (head ignition System). Disconnect sockets of all six valves of injection.
  6. For all models: unscrew all spark plugs.
  7. Press a rubber cone of a manometer to an opening of a candle of the first cylinder (the sequence has no value, but write down) or screw in a connecting tube in a spark plug carving.
  8. Turn on the hand brake, the lever of gear shifting put in neutral situation or the lever selector of an automatic transmission in the situation "R".
  9. Let your assistant a starter will turn the engine. The pedal of gas should be thus wrung completely out (for the purpose of the best filling of the cylinder).
  10. When the pressure indicator already essentially does not rise, write down it and carry out measurements on the following cylinder.

Pressure indicators

Here pressure indicators according to Audi are given:

The 14-cylinder
The 16-cylinder
Alphabetic reference of the engine
Pressure of compression nominal size, bar
Minimum size, bar
The maximum distinction in pressure, a bar