Car fuel injection system Mercedes S-Class (W126)

The principle of operation of the fuel injection system
1. Air flow meter. 2. Support plate (disk). 3. Starting fuel valve. 4. Injector. 5. Idle mixture adjusting screw. 6. Safety switch. 7. Temperature switch. 8. Additional...

Inspection, testing and adjustment of the fuel injection system
Caution: When working on the fuel injection system, it is necessary to maintain impeccable cleanliness. Before removing, the relevant parts must be cleaned with...

Checking the tightness of the injection system connections
If a hot engine is difficult to start, it is necessary to check the injection system seals. With the air filter removed, check the fuel connections in the regulator;...

Checking and adjusting idle speed and CO content
Warm up the engine to an operating temperature of at least 60°C. Caution: Do not adjust idle speed on a very hot engine. Connect the devices for measuring the speed and...

Adjusting the throttle linkage
Check the wear, bending and ease of movement of the rods. Lubricate all rubbing parts with oil. Disconnect the connecting rod (arrow) on the return lever. Move the...

Adjusting the full throttle limiter
Press the gas pedal all the way down (full throttle position) and fix it in this position with a suitable board inserted between the pedal and the seat (for cars with...

Removal, installation and checking the cold start injector
The cold start injector provides additional fuel to the intake manifold during cold engine starting. Injector failure causes engine starting difficulties (both cold and...

Removal, installation and checking the thermal time switch
The thermal time switch limits the injection time of the cold start injector depending on the engine temperature. The temperature at which the thermal time switch...

Checking the additional air damper
When the engine warms up, it requires an increased supply of air-fuel mixture, which is determined by the position of the throttle valve. For this purpose, an additional...

Checking and adjusting the air flow meter flap
If the flow meter flap is in a high position, the engine will not start. Due to incorrect adjustment of the resting position of the flow meter flap, the warmed-up engine...

Checking the cold start valve
During starter operation, the cold start valve additionally injects gasoline into the intake tract. The injection duration depends on the coolant temperature. For...

Adjusting the tempomat
Note: If in cars with a cruise control there are jolts when using the cruise control at a speed above 60 km/h, then it is necessary to remove the cruise control relay...

Checking the temperature sensor
From the NTC sensor, the injection control device receives operational information about the engine temperature. The electrical resistance of the temperature sensor...

Checking the fuel pump
Attention: Observe fire safety regulations, do not work with open fire! To check the pump feed, the tank must be at least half full. Remove the fuel pump relay. Connect...

Removal and installation the fuel pump
Removal Raise the car from behind. Disconnect the ground from the battery. Open and close the gas cap to equalize the pressure. Unscrew the protective cover. Clamp the...

Diagnostics of injection system faults
Before using the table to determine faults, the following conditions must be met: errors during startup are excluded; both with a cold and warm engine, the gas pedal...

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W140 (1991-1998)