Audi A3

Since 1997 of release

Repair and car operation

Audi A3
+ The maintenance instruction
+ Current leaving and service
+ The engine
+ Systems of cooling, heating
- The power supply system and release of the fulfilled gases
   + The power supply system
   - System of injection of fuel
      The general information and security measures
      Removal, installation and check of a fuel distributive highway and injectors
      Check and adjustment of number of turns of a single course/moment of ignition/concentration WITH
   + System of injection of the diesel engine
   + System of release of the fulfilled gases
+ Engine electric equipment
+ Manual box of a gear change
+ Automatic transmission and models with a full drive
+ Coupling and power shafts
+ Brake system
+ Suspension bracket and steering
+ Body
+ Onboard electric equipment
+ Electroschemes

Removal, installation and check of a fuel distributive highway and injectors


Fuel distributive highway with injectors

1 - lock скоба
Watch correct position on an injector and a highway.
2 - a grid
3 - a regulator of pressure of fuel
4 - a sealing ring
At damage replace
5 - an injector
6 - a fuel distributive highway
7 - joining of return of fuel
8 - joining of giving of fuel


1. Disconnect a vacuum hose and расстыкуйте a socket of the valve of switching at the inlet pipeline. Remove tips of spark plugs.
2. Turn away screws with internal шестигранником (are specified by arrows) and reject the top part of the inlet pipeline.


On an illustration the engine of 1.8 l is shown.

3. Disconnect a vacuum hose from a regulator of pressure of fuel.


The fuel system is under pressure! At opening of system fuel can be pulled out, collect its rag. Use thus goggles. Do not smoke, do not use open fire, danger of occurrence of a fire! Keep in readiness the fire extinguisher.

4. Disconnect from a fuel distributive highway the pressure head pipeline, thus collect following fuel a rag.
5. Расстыкуйте a socket to injectors.
6. Turn out bolts of fastening of a fuel distributive highway and take out from a final collector in the complete set injectors with a fuel distributive highway.


On an illustration the engine of 150 h.p. is shown

7. Remove clips of connection of injectors and a fuel distributive highway. Take out injectors from a fuel distributive highway. Injectors only are inserted, but not fixed.


Do not interchange the position of injectors, establish them in a former place.



At installation of injectors into place watch to damaging sealing rings and injectors in a head of cylinders. Sealing rings necessarily replace with the new. Thus it is not necessary to remove forward plastic plugs from injectors.

8. Slightly grease sealing rings before installation into place pure impellent oil.
9. Insert injectors vertically against the stop into a fuel distributive highway and fix скобами.
10. Cautiously insert a highway with injectors into the inlet pipeline and press against the stop.
11. Establish fastening bolts, slightly press hands a fuel distributive highway in a direction of the inlet pipeline and tighten bolts the moment 10 Н m.
12. Join штекерные connections of injectors.
13. Fix submitting pipeline at a fuel distributive highway.
14. Connect the vacuum pipeline at a pressure regulator.
15. Fix the top part of the inlet pipeline with a new lining.
16. Connect a vacuum hose and the connecting tip of the valve of switching at the inlet pipeline.
17. Join штекерные connections of spark plugs.
Check of injectors

Fuel injectors are the electromagnetic valves opened and closed by a control mean of the engine which defines time of opening and duration of injection of fuel, depending on turns of a cranked shaft of the engine, position throttle заслонки, sizes of the arriving weight of air, temperature of air arriving in the engine, temperatures of a cooling liquid and oxygen presence in exhaust gases on the basis of the information, received from the gauges established on the engine and round it. Injectors spray fuel a cone-shaped stream. After dispersion of fuel the injector valve is closed негерметично, problems are possible at start of the hot engine. At faulty injectors the engine can continue to work and after ignition deenergizing, in a mode калильного ignitions.
18. Before check of injectors check up a condition and working capacity of a safety lock of a control system of the engine, the gauge of turns of a cranked shaft and the relay of the fuel pump.
Check of giving of pressure to injectors
19. Disconnect an electric socket from an injector of the first cylinder.
20. Connect to socket contacts a control light-emitting diode. At проворачивании a cranked shaft of the engine a starter the light-emitting diode should blink.
21. Similarly check up pressure giving to other fuel injectors.
The light-emitting diode does not blink on one of cylinders
22. Connect a control light-emitting diode to contact № 1 electric socket for pressure giving to an injector and weight of the car. Connect contact № 2 electric sockets to weight of the car.
23. Turn a cranked shaft of the engine a starter. Thus the light-emitting diode should blink. Otherwise check up all electric feed circuit of injectors.
The light-emitting diode does not blink only on one or on several cylinders
24. Check up a condition of an electric feed circuit of injectors, define and eliminate a place of breakage of an electric chain or its short circuit on weight. Also check up work of the block of engine management.
Resistance check
25. Consistently disconnect electric sockets from injectors and, using an ohmmeter, check up resistance of injectors which should be in limits from 12 to 17 Ohm.


On the engine, heated-up to normal working temperature, resistance of injectors increases on 4 – 6 Ohm.

26. If resistance of an injector differs from demanded, replace it.
Check of a stream of dispersion and tightness of the valve of an injector
27. Disconnect a four-contact electric socket from the gauge of temperature of a cooling liquid.
28. Close contacts 1 and 3 gauges resistance 15 Ohm.
29. Remove a fuel highway together with injectors, without disconnecting from it fuel hoses.
30. Insert injectors into measuring vessels, for example VAG 1602.
31. Ask the assistant to include a starter for some seconds. At work of a starter injectors should spray fuel. Check up a stream of dispersion of fuel which should have the cone-shaped form and to be identical at all injectors.
32. Switch off ignition and check up tightness of injectors. Within 1 minute from injectors should flow out no more than two drops of fuel.
33. Establish a fuel highway together with injectors on the engine. Before installation check up a condition and grease sealing rings of injectors.
34. Connect an electric socket to the gauge of temperature of a cooling liquid.
35. Connect a multicontact electric socket to the block of management of the ignition coil.
36. Establish the top casing of the engine.
Check of a regulator of pressure
37. For exact measurement of pressure of fuel special manometre VAG1318 with additional details which allows to measure control sizes is used. Pressure idling makes 2.5 bar. At removal of a vacuum hose in a place shown by an arrow, pressure increases to 3.0 bar. After the engine will stop, pressure should be not less than 2.3 bar. At the same time pressure through 10 mines should fall to 2.0 bar.
Check of the gauge of temperature of a cooling liquid
38. The gauge carries out a double problem. First, he informs temperature of a cooling liquid in the engine and, secondly, it incorporates to the remote thermometer on the panel of devices. The gauge 2 is on the back party of a head of cylinders. If it is established the conditioner the second gauge of temperature–1 is in immediate proximity. For check do the following:
39. Remove the gauge tip.
40. Connect an ohmmeter to two contacts of the tip 1 and 3. On the cold engine and at a room temperature of the indication of an ohmmeter should be between 1.5 and 3.0 clod. If it not so establish the new gauge.
Check of the gauge of temperature of soaked up air
The gauge is established only on engines with турбокомпрессором. The gauge is established near to the block of management throttle заслонкой.
41. Remove the gauge tip.
42. Connect an ohmmeter to gauge contacts. On the cold engine and at a room temperature resistance should make 1.6 – 2.8 clod. Otherwise replace the gauge.
Check of a measuring instrument of weight of soaked up air
If there is no sufficient experience in electric measurements, can be checked up only pressure giving to a measuring instrument and connection with the management block. Measuring instruments of weight of air on the engine with турбокомпрессором and without it – differ. On the engine without турбокомпрессора it is built in the case of the air filter. The light-emitting diode sampler is necessary for check.
43. Disconnect the tip from a measuring instrument of weight of air.

44. Connect probeы a light-emitting diode sampler between contact 3 tips and "weight".
45. The assistant should include a starter (to get the engine). If the light-emitting diode lights up, pressure on a measuring instrument moves.
46. To check up connections of the block of management, switch off ignition and remove the tip from the block. Now it is necessary to check up current passage.
47. On the tip of the engine without турбокомпрессора, connect an ohmmeter between a conclusion 1 on the tip of the block of management and contact 2 tips of a measuring instrument of weight of air. Besides measure resistance between contact 9 and contact 2. In both cases there should be a conductivity (0 Ohm).

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