Checking injector flow capacity
WARNING:
The check involves partial dismantling of the car's fuel system. The following points should therefore be observed in connection with the work:
- Work only in a well-ventilated area! If approved equipment for the extraction of fuel vapor is available then make sure it is used.
- Wear suitable gloves! Prolonged contact with fuel can cause skin irritation.
- Keep a class BE fire extinguisher close by! Be mindful of the danger of sparks caused by short circuits and when connecting and disconnecting leads in electrical circuits.
- Smoking is strictly forbidden.
IMPORTANT:
Great cleanliness must be observed when working on the fuel rail and injectors. Wash valves, fuel rail and intake manifold and clean them with compressed air.
- Remove the fuel rail.
- Fit the fuel connections to the fuel rail.
Fit a transparent hose on the nozzle. This hose should be about 40 cm long and have an inside diameter of 15 mm.
- Direct the hose into a receptacle/measuring glass.
- Plug in the connectors to their respective injectors.
- Start the fuel pump by connecting cable no. 83 93 886 between fuel pump fuse no. 32, bottom pin, and luggage compartment lighting fuse no. 4, top pin .
- Carry out the flow capacity check using the diagnostic tool. This tool will activate the injector by supplying it with battery voltage for exactly 30 seconds.
- The amount of fuel after 30 seconds should be:
B235R: 176 +/- 10 ml
B205R/L/E: 176 +/- 10 ml
The difference between the injectors should not exceed:
B235R: 20 ml
B205R: 20 ml
B205E: 12 ml
- Change any defective injectors.
- Detach the fuel connections from the fuel rail and fit the fuel rail.