| Assembly overview - parts l and II, intake manifold → Chapter. |
| Assembly overview - fuel rail with injectors → Chapter. |
| Checking vacuum reservoir for leaks → Chapter. |
| Removing and installing air filter → Chapter. |
| Removing and installing regulating flap control unit -J808- and throttle valve module -J338- → Chapter. |
| Cleaning throttle valve module -J338- → Chapter. |
| Assembly overview - high-pressure pump → Chapter. |
| Checking fuel pressure in high-pressure section → Chapter. |
| Removing and installing high-pressure pump → Chapter. |
| Renewing Teflon seal and support washer on injector → Chapter. |
| General notes on injection |
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| The engine control unit -J623- is equipped with self-diagnosis. Before carrying out repairs and fault finding, read fault memory. Also the vacuum hoses and connections must be checked (unmetered air). |
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| Fuel hoses in engine compartment must be secured only with spring-type clips. The use of clamp or screw-type clips is not permissible. |
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| For trouble-free operation of electrical components, a voltage of at least 11.5 V is necessary. |
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| 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. |
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| 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. |
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