Injection system Bosch HFM car Mercedes E-Class (W124)

Technical characteristics of the Bosch HFM fuel injection system
General information Type Sequential engine management system HFM BOSCH Tightening moments Intake manifold to cylinder head mounting bolts 25 Nm Lambda sensor 55 Nm...

General information about the Bosch HFM fuel injection system
The electronic engine management system BOSCH HFM controls the fuel injection system and ignition. The electronic engine management system consists of a fuel tank, an...

Accelerator cable — removal, installation and adjustment
Removal Accelerator cable fastening elements A – throttle valve guide lever; B – accelerator cable fastening element; C – plastic retainer; D – bracket; E – accelerator...

Air filter — removal and installation
Removal 1. Disconnect the spring clips securing the air cleaner cover. 2. Lift the air filter cover and remove the filter element. Installation 1. Carefully clean the...

Air Filter Housing — Removal and Installation
Removal Air filter A – nuts; B – rubber mount; C – spring clamps; D – sealing ring; E – air flow meter 1. Remove the air cleaner element. Unscrew the bolts and remove...

Throttle body — removal and installation
Removal Throttle body A – mounting bolts; B – accelerator cable; C – pressure control cable 1. Remove the ground cable from the battery. 2. Remove the intake manifold....

Intake manifold — removal and installation
Removal Location of rubber mounts for air intake tube to cylinder head Intake manifold fastening elements A – intake manifold; B – bolts securing the intake manifold to...

Air flow meter — removal and installation
Removal Air flow meter 1 – electrical connector; 2 – spring clamp; 3 – clamp 1. Remove the ground cable from the battery. 2. Disconnect the electrical connector from the...

Coolant Temperature Sensor — Removal and Installation
Removal 1. Drain some of the coolant from the cooling system. Check that the ignition is off. 2. The engine management system coolant temperature sensor is screwed into...

Lambda sensor — removal and installation
Removal 1. The lambda sensor is screwed into the exhaust pipe and can be accessed from underneath the vehicle. 2. Raise the front of the vehicle and secure it on stands...

Electronic Control Unit (ECU)
Caution! The Electronic Control Unit (ECU) contains static-sensitive components, so when disconnecting electrical connectors from the ECU, do not touch the connector...

Fuel injectors and fuel line
Removal Fuel line A – Fuel injector sealing ring; B – fuel line mounting bolts; C – return fuel hose; D – fuel supply hose; E – Throttle body vacuum hose; F – Fuel...

Fuel pressure regulator — removal and installation
Removal Fuel pressure regulator A – fuel pressure regulator housing; B – retaining ring; C – sealing rings; D – vacuum hose 1. Relieve pressure in the fuel system. 2....

Relieving pressure in the fuel system
Warning! Gasoline is extremely flammable and explosive, so care must be taken when working on any part of the fuel system. Warning: The container that held the fuel...

Adjusting idle speed and CO content in exhaust gases
To check the idle speed and CO content in the exhaust gases, it is necessary to use an accurate tachometer and an exhaust gas analyzer. If the measured values do not...

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TEXTHTMLBB Code

W210 (1996-2002)

W124 (1984-1995)