Power supply system for gasoline engines BMW 5 Series E34

Engine power supply system — general information and design
The engine fuel system includes the fuel tank, fuel lines, fuel filter, fuel pump and carburetor or fuel injection device with air filter. The fuel tank is...

Rules for maintaining cleanliness when working with the fuel system
When working with the fuel system, it is imperative to follow the following rules: Before removing, thoroughly clean the connection points and their...

Checking the fuel pump relay
The fuel pump relay is located in the relay box at the right rear of the engine compartment. It supplies power to the fuel pump. When the pulses from the speed...

Checking Fuel Pump Performance — Gasoline Engines
Note: On diesel engines, the fuel pressure is measured in the fuel line between the filter and the high-pressure fuel pump, which can only be done at a service...

Fuel level sensor and fuel pump
Engines M20/M30 - fig. W-2036; engine M21 - Fig. W-2037. Fuel pump engines M20/M30 1 Fuel level float sensor 2 Sealing ring 3 Nut M6 4 Union nut 5 Fuel pump 6...

Removal and installation, checking of fuel level sensor
When the fuel level in the fuel tank drops, the float of the fuel reserve sensor drops. At the same time, the resistance of the sensor, taken from the sliding...

Removal and installation the fuel pump
The fuel pump is located in the fuel tank next to the fuel gauge. References in the text are to Figure W-2036. Removal Warning: Do not make open fire! Fire...

Removal and installation the air filter housing / air flow meter
Models 520i, 525i Removal (see figure W - 1075) Loosen clamp 1, disconnect the air hose from the "arrow" mount on the air filter housing and pull it out. Cut...

Fuel injection device for gasoline engines
Figure Y— 2203. Motronic system 1 Fuel tank 2 Fuel pump 3 Fuel filter 4 Fuel pressure regulator 5 Electronic control unit 6 Ignition coil 7 High voltage...

Operating principle of the Motronic DME M1.1 and M1.7 system
Fuel is supplied by an electric fuel pump from the fuel tank through the fuel filter to the distribution pipe and then to the valve injectors. A pressure...

Motronic DME M3.1 system on 4-valve engines
The DME M3.1 system on the 520i and 525i models produced since May 1990 is a development of the Motronic M1.1 system. Instead of an air volume flow meter, an...

Rules for maintaining cleanliness when working with a fuel injection device
Thoroughly clean the connection points and their surroundings with gasoline. Place the removed parts on a clean lining and cover. Use film or paper. Do not use...

Safety rules for working with fuel injection devices
Do not start the engine if the battery is not secured. Never disconnect the battery while the engine is running. When charging the battery with a fast charger,...

Self-diagnosis system and error codes
If a fault occurs in the ignition and fuel injection system while driving, the fault is stored in the control unit as a code. At the same time, the control...

Checking the idle speed and CO content
Note: When the Motronic system is operating, the idle speed is controlled by an electronically controlled idle speed controller. Turn off all electrical...

Checking the lambda probe operation
Short-circuit the vacuum hose from the fuel pressure regulator. Caution: Switch off the engine first. Start the engine, the CO content increases. Connect the...

Adjusting the throttle cable
Caution: The gas cable is sensitive to bending and therefore requires special care during installation. A single slight bend in the cable can cause the cable...

Disconnecting the throttle cable from the throttle lever
Apply throttle with throttle lever 2 to relieve the throttle cable nipple. Pull the nipple out of the clamp with a narrow screwdriver. Squeeze the clamp, pull...

Removal and installation, checking of the idle speed control valve
Note: To check if the idle speed control valve is working, place your hand on the valve. When the engine is running, the valve should vibrate from the power...

Resistance check
Connect an ohmmeter to the valve contacts and measure the resistance: terminals 1 and 2 about 40 ohms. terminals 2 and 1, or 2 and 3: about 20 ohms. Dynamic...

Removal and installation, checking of temperature sensor
The temperature sensor measures the engine temperature and transmits this information to the control unit. The temperature sensor contains an NTC element (NTC...

Removal and installation, checking of the fuel tank ventilation valve
The fuel tank ventilation valve regulates the supply of fuel vapors from the activated carbon container, which are burned when the engine is running. The...

Diagnostics of injection system faults
Before troubleshooting using the following diagnostic chart, the following test conditions must be met: driver errors when starting the engine are excluded:...

Technical data of the injection system of gasoline engines (DME)
Resistance values measured at 23°+5°C

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