BMW 3 Series E30

since 1983-1994 release

Repair and operation of the car



BMW E30
+ 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. Air stream measuring instrument
   6.5. Throttle branch pipe
   6.6. Fuel pressure regulator
   6.7. Nozzle of launch of the cold engine and thermotimer
   6.8. Check and replacement of nozzles
   6.9. Air proofreader 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. Fuel pipes and union
   6.14. Fuel tank
   6.15. Air filter
   6.16. Cable of the 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. Useful tips



6.9. Air proofreader of idling

GENERAL INFORMATION

The air proofreader provides stabilization of turns of idling within ±200 rpm at variable loading of the engine idling. The proofreader represents the solenoidal valve opening a bypass for the air coming to zadrosselny space when falling turns it is lower than 750 rpm. When turns exceed 950 rpm the valve is closed and turns decrease.

The separate control unit of the proofreader of idling which is located under the forward panel of salon is provided in system of injection L-Jetronic. On the proofreader of idling there is an adjusting screw.

Are also provided in the early Motronic system the separate control unit of the proofreader of idling which is located under the forward panel of salon, and the adjusting screw.

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

Before check the engine has to be heated-up, onboard consumers are disconnected, sensors of turn of the gate and the sensor of oxygen have to be serviceable, leaks in the exhaust system and vacuum hoses have to be absent.

Connect a tachometer.

During the operation of the engine from the proofreader the buzzing sound has to be listened.

System of injection L-Jetronic

The control unit of the proofreader of idling (a look at the removed box for trifles)

On the socket there are numbers of conclusions.

At a detachment from the proofreader of the socket turns of idling have to increase up to 2000 rpm.

Otherwise stop the engine and check the valve winding resistance which has to be 9–10 Ohms at 20 °C.

Check operation of the valve, having given on it tension from the battery. After removal of tension the valve has to open.

If results at least of one of tests unsatisfactory, then replace the proofreader's valve.

If results of tests satisfactory, then check the current consumed by the proofreader.

Open the socket and turn on the ampermeter between one of couples corresponding (And) conclusions, connect the second couple a crossing point. Idling current has to be 0,4-0,5 A, if necessary adjust current.

Prevention

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


If current is not registered, then hand over the electronic block of idling in car service 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 condition of the socket. It is recommended to put temporarily the new block and to compare work of the proofreader with this block.


Adjustment

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

Prevention

On the proofreader in the metal case the screw is taken out out of case limits. If the proofreader's case plastic, then the screw is in and for access to it it is necessary to remove the case from a back part of the proofreader.


Motronic system


Prevention

2 types of proofreaders – with 2 and 3 conclusions are provided in this system (the last are established on late models).


The screw for adjustment of the proofreader of idling in the metal case

The screw for adjustment of the proofreader of idling in the plastic case

For access to the screw remove a hose.

At a detachment from the proofreader of the socket turns of idling have to increase up to 2000 rpm.

Otherwise execute the following.

On the 2-wire proofreader check operation of the valve, having given on it tension from the battery. After removal of tension the valve has to open. Stop the engine and check the valve winding resistance which has to be 9–10 Ohms.

On the 3-wire proofreader stop the engine and check resistance between extreme conclusions which has to be 40 Ohms.

At connection of 12 V to conclusions of the 2-wire proofreader the piston (shooter) has to move and close the air channel of the proofreader.

If results at least of one of tests unsatisfactory, then replace the proofreader's valve.

If results of tests satisfactory, then check the current consumed by the 2-wire proofreader or tension on the 3-wire proofreader.

On 2-wire the proofreader connect the ampermeter. Idling current has to be 0,4-0,5 A, if necessary adjust current.


Prevention

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


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

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

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

Adjustment (only on early models)

PERFORMANCE ORDER
1. Switch off ignition and connect a tachometer.
2. Make sure that the moment of ignition is exposed correctly (see subsection 3.3.6.3).
3. Connect the ampermeter.
4. Check current which has to be 0,45-0,47 A at 700–750 rpm.
5. If necessary adjust current, rotating the screw (rotation clockwise increases current and vice versa).

Replacement

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