Injectors

Safety precautions ⇒ 2.1 Safety regulations for working on fuel supply.

General notes on injection

• The engine control unit - J623- is capable of self-diagnosis. Before carrying out repairs and for fault finding, first read event memory. Also the vacuum hoses and connections must be checked (unmetered air).
• Fuel hoses in engine compartment must be secured only with spring-type clips. The use of crimp-type or screw-type clips is not permissible.
• For trouble-free operation of electrical components, a voltage of at least 11.5 V is necessary.
• Do not use sealants containing silicone. Particles of silicone drawn into the engine will not be burnt in the engine and damage the Lambda probe.
• Vehicles are fitted with a crash fuel shut-off circuit. It reduces the danger of a fire in a crash as the fuel pump is switched off via the fuel pump relay. The system also improves the starting characteristics of the engine. When door is opened, the fuel pump is activated for 2 seconds to build up pressure in the fuel system.

⇒ 3.1 Assembly overview - fuel rail with injectors

⇒ 3.2 Removing and installing injectors

⇒ 3.3 Renewing seals on injectors