Checking injection nozzles (Audi 80 B2)

Unscrew the nozzle from the socket and screw in a spare nozzle in its place.

Lower the nozzle into the measuring cup.

Start the engine, let it run at a crankshaft speed of about 2000 rpm and check that the fuel injected by the injector has the shape of a regular cone.

Stop the engine. Not a single drop of fuel should appear from the injector nozzle.

Check other injectors in the same way.

You can more accurately check the technical condition of the injectors using a stand that includes a hand pump and a nanometer.

Connect the injector to be tested to the stand according to the operating instructions and check the fuel injection pressure. A properly functioning injector should inject fuel 2 at a pressure of 2.5-3.5 kg/cm².

Check the injector for leaks. To do this, use the stand pump to create a pressure 0.5 kg/cm² lower than the injector fuel injection pressure and maintain it for 15 seconds, during which not a single drop of fuel should leak from the injector nozzle.

Press the pump lever of the stand with a frequency of one stroke per second. In this case, fuel should be sprayed from the nozzle with a humming sound in the form of a cone at an angle of approximately 35°.

If the injector does not meet at least one of the above requirements, it must be replaced.