E30 series BMW 3

since 1983-1994 of release

Repair and car operation

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)

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

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.

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.

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.

Motronic system

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 plastic case

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.

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.

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 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)

Replacement