- intermittent ignition of the fuel mixture;
- knocking in one or more cylinders;
- engine overheating;
- loss of power;
- black exhaust smoke;
- high fuel consumption;
- blue exhaust smoke when starting a cold engine.
The faulty injector can be identified by disconnecting the high-pressure fuel lines from the injectors one by one while the engine is running at high idle speed. When removing the injector, proceed as follows:
- disconnect the wires from the battery;
- unscrew the engine cover bolt, disconnect the hose from it and remove the cover;
Fig. 478. Removing the fuel lines. Arrows indicate the connection points of the fuel lines
- loosen and unscrew the union nuts of the high-pressure fuel lines (Fig. 478). Remove all fuel lines as a set. Do not bend the fuel lines;
- disconnect the fuel lines from the injection pump;
- remove the spring clamp from the oil drain hose and remove the hose kit;
Fig. 479. Oil leak hoses are placed on small nozzles of injectors
- disconnect the oil drain hoses from the injectors (Fig. 479);
- remove the needle lift sensor connector from the holder, and then disconnect the connector. Do not pull the cable;
- release the needle lift sensor cable from the clamps securing the glow plug wire harness mount;
- disconnect the glow plug wire harness;
Fig. 480. Removing the injector pressure plates
- unscrew the bolts of the injector clamping rails (Fig. 480) and remove the rails;
- remove the injectors. Use a screwdriver to remove the washers located under the injectors. On injector No.3 there is a connection point for the oil drain pipe. Unscrew the hollow bolt. If necessary, the connection point for the oil drain pipe can be removed.
(The original information is posted on the resource www.VWmanual.ru)
The installation of the injectors is done in the reverse order of the removal process. In this case, always replace the washers located under the injectors with new ones.
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