E30 series BMW 3

since 1983-1994 of release

Repair and car operation



E30 BMW
+ 1. Maintenance instruction
+ 2. Maintenance
+ 3. Engine
+ 4. Cooling system
+ 5. Heating and ventilation
- 6. Fuel system
   6.2. Specifications
   6.3. Check of system of injection
   6.4. Measuring instrument of a stream of air
   6.5. Throttle branch pipe
   6.6. Regulator of pressure of fuel
   6.7. Nozzle of start-up of the cold engine and thermotimer
   6.8. Check and replacement of nozzles
   6.9. Air proof-reader of idling
   6.10. Order of a decompression of fuel system
   6.11. Check of pressure of fuel
   6.12. The fuel pump, the pump of pumping and the fuel level sensor in a tank
   6.13. Gasoline pipe lines and union
   6.14. Fuel tank
   6.15. Air filter
   6.16. Cable of a drive of a butterfly valve
   6.17. Carburetor
+ 7. Exhaust system
+ 8. Transmissions
+ 9. Coupling
+ 10. Brake system
+ 11. Running gear
+ 12. Body
+ 13. Electric equipment
+ 14. Good advice



6.9. Air proof-reader of idling

GENERAL INFORMATION

The air proof-reader provides stabilization of turns of idling in limits ±200 in rpm at variable loading of the engine idling. The proof-reader represents the solenoidal valve, opening the perepuskny suited for the air arriving in zadrosselny space at falling of turns 750 rpm are lower. When turns exceed 950 rpm the valve is closed and turns decrease.

In system of injection of L-Jetronic the separate control unit is provided by the proof-reader of idling who is located under the forward panel of salon. On the proof-reader of idling there is an adjusting screw.

In early system Motronic are also provided the separate control unit by the proof-reader of idling who is located under the forward panel of salon, and the adjusting screw.

In late system Motronic work of the proof-reader of idling the processor block operates, manual adjustment is not provided.

Before check the engine should be heated-up, onboard consumers are disconnected, sensors of turn of a zaslonka and the sensor of oxygen should be serviceable, leaks in an exhaust system and vacuum hoses should be absent.

Connect a tachometer.

At operation of the engine from the proof-reader the buzzing sound should be listened.

System of injection of L-Jetronic

The control unit the proof-reader of idling (a look at the removed box for trifles)

On the socket there are numbers of conclusions.

At a detachment from the proof-reader of the socket turns of idling should increase to 2000 rpm.

Otherwise stop the engine and check resistance of a winding of the valve which should be 9–10 Ohm at 20 ° Page.

Check valve operation, having submitted on it tension from the battery. After tension removal the valve should open.

If results at least one of tests unsatisfactory, replace the valve of the proof-reader.

If results of tests satisfactory, check a current consumed by the proof-reader.

Open the socket and turn on the ampermeter between one of pairs respective (And) the conclusions, the second pair connect a crossing point. Idling the current should be 0,4–0,5 And, if necessary adjust a current.

Prevention

If the current of the proof-reader changes from 0,4 to 1,1 And, it indicates that the engine cold, malfunction of the sensor of temperature, on need of adjustment of idling, on a leakage of vacuum connections or that onboard consumers are included.


If the current is not registered, hand over the electronic block of idling in car-care center for check and repair.
Prevention

As a rule malfunction of the block of idling is shown in the form of violation of contacts in the socket. Therefore, before acquisition of the new block check a socket condition. It is recommended to put temporarily the new block and to compare work of the proof-reader to this block.


Adjustment

PERFORMANCE ORDER
1. Switch off ignition and connect a tachometer.
2. Be convinced that the moment of ignition is exposed correctly (see subsection 3.3.6.3).
3. Connect the ampermeter.
4. Check a current which should be 0,45–0,47 And at 850–900 rpm on cars from a manual transmission and 0,46–0,48 And at 850–900 rpm on cars from an automatic transmission.
5. If necessary adjust a current, rotating the screw.

Prevention

On the proof-reader in the metal case the screw is taken out out of case limits. If the case of the proof-reader plastic, the screw is in and for access to it it is necessary to remove the case from a back part of the proof-reader.


Motronic system


Prevention

In this system 2 types of proof-readers – with 2 and 3 conclusions (the last are established on late models) are provided.


The screw for adjustment of the proof-reader of idling in the metal case

The screw for adjustment of the proof-reader of idling in the plastic case

For access to the screw remove a hose.

At a detachment from the proof-reader of the socket turns of idling should increase to 2000 rpm.

Otherwise execute the following.

On the 2-wire proof-reader check valve operation, having submitted on it tension from the battery. After tension removal the valve should open. Stop the engine and check resistance of a winding of the valve which should be 9–10 Ohm.

On the 3-wire proof-reader stop the engine and check resistance between extreme conclusions which should be 40 Ohm.

At connection 12 In to conclusions of the 2-wire proof-reader the piston (shooter) should move and close the air channel of the proof-reader.

If results at least one of tests unsatisfactory, replace the valve of the proof-reader.

If results of tests satisfactory, check a current consumed by the 2-wire proof-reader or tension on the 3-wire proof-reader.

On 2-wire the proof-reader connect the ampermeter. Idling the current should be 0,4–0,5 And, if necessary adjust a current.


Prevention

If the current of the proof-reader changes from 0,4 to 1,1 And, it indicates that the engine cold, malfunction of the sensor of temperature, on a leakage of vacuum connections or that onboard consumers are included.


If the current is not registered, hand over the electronic block of idling in car-care center for check and repair.

Tension on an average conclusion of the socket of the 3-wire proof-reader at inclusion of ignition should be equal to tension of the battery. Between extreme and average conclusions tension should be about 10 Century.

If tension is not registered, hand over the electronic block of idling (or the processor block of the engine on late models) in car-care center for check and repair.

Adjustment (only on early models)

PERFORMANCE ORDER
1. Switch off ignition and connect a tachometer.
2. Be convinced that the moment of ignition is exposed correctly (see subsection 3.3.6.3).
3. Connect the ampermeter.
4. Check a current which should be 0,45–0,47 And at 700–750 rpm.
5. If necessary adjust a current, rotating the screw (rotation clockwise increases a current and on the contrary).

Replacement

PERFORMANCE ORDER
1. Disconnect the socket, remove an arm. Remove the proof-reader, having disconnected hoses.
2. Installation is carried out upside-down.