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REPAIR MAINTENANCE OPERATION OF MOTOR VEHICLES
Mercedes-Benz E-Class W123 (from 1976 to 1985, the year of issue)
general info. full specifications. diagnostics. hints. tips. tricks
 Mercedes-Benz W123
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Mercedes-Benz
W123
Introduction
Gasoline engines
Design and specifications
Engine adjustment
Ignition system
Power system
The fuel injection system K-Jetronic
The fuel injection system L-Jetronic
Checking injectors
Adjusting the engine idling
Check valve further fuel supply
Check thermo
Check thermoelectric switch
Check thermal time relay
Possible malfunctions of the system L-Jetronic, their causes and remedies
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Work on the engine M 102
Work on the engine M 110 and M 123
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Automatic Transmission
Driveline and rear axle
The front suspension
Rear suspension
A steering
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Hit Counter by Digits


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Possible malfunctions of the system L-Jetronic, their causes and remedies



Troubleshooting 1-8

  1. The engine does not start (the oil temperature is less than or equal to 20 ?� C).
  2. The engine does not start (oil temperature is greater than or equal to 60 ?� C).
  3. Difficult engine start (oil temperature is less than or equal to 20 ?� C).
  4. Hindered start (oil temperature is greater than or equal to 60 ?� C).
  5. The engine is started and the "stalling".
  6. The engine is unstable idling at warming.
  7. Idling the engine does not meet the standard value.
  8. The engine works with faults idling.

Fault number

Check

1

2
3

4

5
6
7
8

X

X

X

X

Fuel pump

X

X

X

X

The fine filter fuel

X

X

X

X

X

X

Pressure injection nozzles

X

X

X

X

X

X

The discharge pressure of the fuel pump

X

X

X

The performance of the fuel pump

X

X

Fuel quality

X

X

X

X

Fuel delivery valve further

X

X

X

X

Thermal time switch

X

X

X

X

Starting jet

X

X

X

X

X

X

X

X

Injectors

X

X

X

X

X

Coolant temperature

X

Switch Throttle

X

X

X

X

Throttle Body

X

X

X

X

Pneumatic throttle

X

X

X

X

X

X

X

X

Airflow Meter

X

X

X

X

X

X

X

X

The electronic control unit

X

X

X

X

X

X

X

X

Electric wires and connections

X

X

X

X

X

The relay of inclusion of the fuel pump

X

X

X

X

X

Air filter

X

X

Engine cooling system

X

X

Potting Compounds in the intake tract of the engine

X

X

X

X

The lack of outside air entering the engine

X

X

X

X

X

X

X

Air intake

Lack of fuel mixture at part load engine

Troubleshooting 9-17

  1. Engine "shakes" when accelerating.
  2. Engine "shaking" motion at constant speed c.
  3. Engine "shakes" in the forced idling.
  4. Knock on the engine by increasing the speed of the crankshaft.
  5. The engine does not have enough acceleration.
  6. Increased fuel consumption.
  7. Elevated levels of carbon monoxide and hydrocarbons in the exhaust at idle.
  8. Reduced carbon monoxide and hydrocarbons in the exhaust gases at idle.
  9. Engine does not develop full power.
Fault number
Check

9

10
eleven
12
13

14

15
16
17

X

X

Fuel pump

X

X

X

X

The fine filter fuel

X

X

X

X

X

Pressure injection nozzles

X

X

X

X

The discharge pressure of the fuel pump

X

X

X

The performance of the fuel pump

X

X

X

X

X

X

Fuel quality

X

Fuel delivery valve further

X

X

X

Thermal time switch

X

X

X

X

X

Starting jet

X

X

X

X

X

X

X

X

Injectors

X

X

X

X

X

X

X

X

Coolant temperature

X

X

X

X

Switch Throttle

X

X

X

Throttle Body

X

Pneumatic throttle

X

X

X

X

X

X

X

X

X

Airflow Meter

X

X

X

X

X

X

X

X

X

The electronic control unit

X

X

X

X

X

X

X

X

X

Electric wires and connections

X

The relay of inclusion of the fuel pump

X

X

X

X

X

X

X

Air filter

X

X

X

X

X

X

X

Engine cooling system

X

X

X

Potting Compounds in the intake tract of the engine

X

X

X

X

The lack of outside air entering the engine

X

X

X

X

X

Air intake

X

X

X

X

X

Lack of fuel mixture at part load engine





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