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Test fuel pressure regulator and holding pressure > < Checking the tightness of the injection valves

Fabia Mk2

Testing fuel injection rate
Testing fuel injection rate
Test conditions
l  The fuel pressure must be OK, test → Chapter
l  Injection valves must be installed in the fuel rail and fuel line connected
l  Fuel temperature 15...20°C, fuel must according to the valid standards
–  Insert injector to be tested in a measuring glass, e.g. -V.A.G 1602-.
   
–  Remove fuse for protection of injection valves from the fuse carrier below the dash panel according to current flow diagrams → Current flow diagrams and Fitting locations.
–  Connect a terminal of the relevant fuse socket and battery positive (+) with adapter cables from the measuring tool set, so that the fuel delivery unit runs.
  Note
This step is only intended to ensure that the fuel delivery unit runs when the engine is switched off.
  S20-0290
–  Connect a contact of the injection valve on the engine mass using adapter cables from the mesuring tool set.
–  Connect the second contact of the injection valve to the remote control e.g. -V.A.G 1348/3 A- with the adapter cable, e.g. -V.A.G 1348/3-2-.
–  Connect alligator clip to the battery (+).
–  Activate remote control -V.A.G 1348/3 A- for 30 seconds.
Also perform a visual inspection of the jet formation.
–  Repeat the test at the other injectors in sequence. To do so always use a new measuring glass.
–  After all the injectors have been operated, place the measuring glasses on a flat surface and compare the quantities of fuel injected.
Specified value: 96 ... 104 ml (per injection valve)
The injection rate must be the same for all injection valves.
If the measurement obtained for one or several injectors is below or above the specification:
–  Replace the faulty injector → Chapter.
The injectors are installed in the reverse order for removal. Pay attention to the following:
t  Replace the O-rings on all the injectors and moisten lightly with clean engine oil.
t  Fit the fuel rail with the installed injection valves to the intake manifold and tighten screws uniformly to 7 Nm.
  S24-0579

Test fuel pressure regulator and holding pressure > < Checking the tightness of the injection valves