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Removing and installing injectors > < Checking return flow rate of injectors at starter cranking speed

A3 Mk2

Checking for injectors sticking open
Checking for injectors sticking open
Special tools and workshop equipment required
   
t  Hand vacuum pump -VAS 6213-
  W00-10259
t  Use a return line to make an -adapter-.
  WARNING
t  Always read rules for cleanliness and instructions for working on fuel system → Chapter.
t  Follow these instructions and rules for cleanliness before starting work and while working on the fuel system.
–  Erase entry in event memory → Vehicle diagnostic tester.
–  Remove engine cover panel → Chapter.
–  Clean all connections (with commercial cleaning solution or similar) before removing.
  Note
t  Make sure all parts are clean; no dirt must be allowed to enter the fuel system.
t  Check all cylinders in turn.
–  Dry all components after cleaning.
Start with cylinder No. 1.
  N23-10450
–  Pull return line connections off injectors; to do so, press tabs -1- and -2- down and at the same time pull release pin upwards -arrow-.
–  Connect adapter to return line connection of injector to be tested after adapter has been cleaned and blown out.
–  Generate a vacuum of -500 mbar using the hand vacuum pump -VAS 6213-.
If the vacuum reading remains the same for 30 seconds, the injector is OK.
If the injector is faulty, the vacuum reading will fall back to 0 bar within 2 to 3 seconds.
Repeat test if necessary; note drop in vacuum reading on hand vacuum pump -VAS 6213-.
–  Renew faulty injectors → Chapter.
  A23-10455

Removing and installing injectors > < Checking return flow rate of injectors at starter cranking speed