BMW 5 Series E28 car engine power system

General information about the power supply system
All engines except early models (518) are equipped with an electronic fuel injection system. Early 518 models are fitted with Solex carburettors. Either the...

Relieving pressure in the fuel injection system
Fuel is extremely flammable, so take extra precautions when working on any part of the fuel system. Do not smoke or allow open flames or unshaded lamps near...

Checking fuel pressure/fuel pump
Fuel is extremely flammable, so take extra precautions when working on any part of the fuel system. Do not smoke or allow open flames or bare lamps near the...

Removal and installation the fuel pump, intermediate pump and fuel level sensor
Fuel is extremely flammable, so take extra precautions when working on any part of the fuel system. Do not smoke, do not allow open flames or bare lamps near...

Repair and replacement of fuel lines and connectors
Fuel is extremely flammable, so take extra precautions when working on any part of the fuel system. Do not smoke or allow open flames or unshaded lamps near...

Removal and installation the fuel tank
General view of the fuel tank on later models 1. To relieve pressure inside the fuel tank, remove the filler cap. 2. On fuel injected models, relieve fuel...

General information about cleaning and repairing the fuel tank
Any repairs to the fuel tank and filler neck should be performed by a professional experienced in such critical and potentially dangerous work. Even after...

Removal and installation the air cleaner
Disconnect the negative battery cable. If your car's radio has an anti-theft system, make sure you know the correct activation code before disconnecting the...

Checking, adjusting and replacing the accelerator cable
Examination 1. Disconnect the intake air duct from the throttle body (fuel injection models) or remove the air cleaner (carburetor models). 2. Observe the...

General information about the carburetor
Early models are equipped with a Solex 2B4 carburetor, while later models are equipped with a Solex 2BE carburetor. Both carburetors are two-chamber, downdraft...

Removal and installation the carburetor
Removal 1. Remove the air cleaner as described in Section Removal and installation the air cleaner . 2. Disconnect the accelerator cable from the carburetor,...

Cleaning and adjusting the carburetor
This section describes the procedure for the 2B4 carburetor. The procedure for the 2BE carburetor is similar. Cleaning 1. Purchase a complete set of gaskets...

General information about fuel injection
The fuel injection system consists of three main subsystems: the fuel system, the air intake system and the electronic control system. Fuel system An electric...

Fuel injection systems
L-Jetronic fuel injection system The Bosch L-Jetronic fuel injection system was used on most E28 ("old style") models. This electronically controlled fuel...

Checking the operation of the fuel injection system
Fuel is extremely flammable, so take extra precautions when working on any part of the fuel system. Do not smoke or allow open flames or unshaded lamps near...

Checking the operation, removing and installing the air flow meter
Examination (l-Jetronic systems) 1. Disconnect the air flow meter from the inlet fitting. Carefully open and close the sensor flap and check for binding. The...

Checking the operation, removing and installing the throttle body
Examination 1. Disconnect the air intake duct from the throttle body (see section Removal and installation the air cleaner ) and take it aside. 2. Observe the...

Checking the operation and replacing the fuel pressure regulator
Fuel is extremely flammable, so take extra precautions when working on any part of the fuel system. Do not smoke or allow open flames or unshaded lamps near...

Checking the operation and replacing the cold start injector and temperature switch
Fuel is extremely flammable, so take extra precautions when working on any part of the fuel system. Do not smoke or allow open flames or unshaded lamps near...

Checking the operation and replacing fuel injectors
Fuel is extremely flammable, so take extra precautions when working on any part of the fuel system. Do not smoke or allow open flames or unshaded lamps near...

Checking the operation, adjusting and replacing the idle air stabilization valve
The air-cooled idling stabilization system ensures that the idling speed is maintained within the 200 rpm range, regardless of the idling load changes on the...

Troubleshooting the Fuel Injection System
L-Jetronic fuel injection system Malfunction Possible cause Method of elimination Engine (cold) starts with difficulty or does not start Cold start injector or...

Diagnostics of power supply system faults
Symptom Possible cause Excessive fuel consumption The air cleaner filter element is dirty or its patency is otherwise impaired (see chapter Routine car...

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