Mercedes W124

since 1985-1995 of release

Repair and car operation



W124 Mercedes
+ Governing bodies and control devices
+ MAINTENANCE
+ 2. Maintenance (diesel engines)
+ ENGINE
+ 4. Repair of 6-cylinder petrol SOHC engines
+ 5. Repair of 6-cylinder petrol DOHC engines
+ 6. Repair of the diesel engine established in the car
+ 7. Major maintenance of engines
+ COOLING SYSTEM
+ FUEL SYSTEM
+ 10. System of injection of BOSCH CIS-E fuel (KE-JETRONIC)
+ 11. System of injection of BOSCH HFM fuel
+ 12. Fuel system of diesel engines
+ 13. Fuel system of diesel engines
+ SYSTEMS OF START, IGNITION
- 15. System of ignition of 4-cylinder petrol engines
   15.2. System of ignition of EZL
   15.3. System of ignition of TFZ
   15.4. Check of system of ignition
   15.5. Ignition coil
   15.6. Ignition distributor
   15.7. Distributor rotor
   15.8. Corner of an advancing of ignition
   15.9. Elements of a control system of ignition
+ 16. System of ignition of four-cylinder petrol engines
+ PRESTARTING HEATING
+ TRANSMISSION
+ 19. Mechanical transmission
+ 20. Automatic transmission
+ POWER SHAFTS
+ BRAKE SYSTEM
+ SUSPENSION BRACKET
+ BODY
+ ELECTRIC EQUIPMENT
+ CHECK OF MALFUNCTIONS






15.8. Corner of an advancing of ignition

System of ignition of EZL

The system of ignition of EZL works at the basis of the signal received from the sensor of an angle of rotation of a cranked shaft. The system of ignition establishes a demanded corner of an advancing of ignition on the basis of information on engine turns, the provision of a cranked shaft and depression in the inlet collector, received from the sensors established on the engine.

Distinctive feature of system of ignition of EZL is that it is impossible to adjust the initial moment of an advancing of ignition by turn of the case of the distributor concerning a shaft.

However the initial corner of an advancing of ignition can be changed depending on type of used fuel. For this purpose it is necessary to change the provision of a switching cap in a nest of the fine tuning, located in a motor compartment near the ECU block. In a switching cap resistors of various resistance are established. The cap can be established in some provisions according to labels on a cap. Depending on what resistor of a cap is connected at present to nest contacts, the ECU block of system of ignition increases or reduces an initial corner of an advancing of ignition with a step in 3 °.

It is possible to measure a corner of an advancing of ignition also, using a stroboscope.

System of ignition of TFZ

The system of ignition of TFZ copes the sensor of impulses established in the case of the distributor of ignition. In this case the initial corner of an advancing of ignition can be adjusted by turn of the case of the distributor concerning a shaft.

Check of a corner of an advancing of ignition


Prevention

Check of a corner of an advancing of ignition is necessary for making on the engine, heated-up to normal working temperature. It is desirable to finish check of a corner of an advancing of ignition before the temperature of cooling liquid will exceed 95 ° With or before the radiator fan will turn on.


Definition of a corner of an advancing of ignition on a label on a pulley of the cranked shaft, combined with the index

PERFORMANCE ORDER
1. Connect a stroboscope according to its maintenance instruction. Thus start of a stroboscope should be made from a high-voltage wire of the 1st cylinder.
2. Start the engine on idling turns. Direct stroboscope light on the index on a cover of a driving chain. The label on a pulley of a cranked shaft seems motionless and should be combined with the index. If the label moves to one or other party, means, turns of idling are unstable. At check of a corner of an advancing of ignition all electric consumers should be switched off and the fan of a radiator should not work. At operation of the engine idling for some time even at the engine, heated-up to normal working temperature, especially at high temperature of external air turns of idling can be unstable.
3. Determine a corner of an advancing of ignition by a label on a pulley of the cranked shaft, combined with the index (see drawing).
4. If the corner of an advancing of ignition differs more than on 3 ° from demanded, probably, the cap in a nest of fine tuning is incorrectly established. Check the provision of a cap in a nest of fine tuning and, if necessary, establish it according to type of applied fuel.

Adjustment of a corner of an advancing of ignition


Prevention

Adjustment of a corner of an advancing of ignition is possible only on models with system of ignition of TSZ.


PERFORMANCE ORDER
1. Adjustment of a corner of an advancing of ignition make on the switched-off engine not to receive blow an electric current. Weaken a bolt of fastening of the distributor of ignition.
Prevention

Put a combination label on the case of the distributor of ignition and a head of the block of cylinders in order that it was possible to establish the distributor of ignition in a starting position in attempt to adjust the ignition, ended failure.


2. For increase in a corner of an advancing of ignition turn the distributor case clockwise, and for reduction counter-clockwise. Tighten a bolt of fastening of the distributor of ignition and, using a stroboscope, check an initial corner of an advancing of ignition. Repeat this operation until the demanded initial corner of an advancing of ignition will be established. tighten a bolt of fastening of the distributor of ignition the demanded moment and disconnect a stroboscope.