Checking injector flow capacity
WARNING:
Removal of the fuel pressure regulator involves partial dismantling of the car's fuel system. The following points must therefore be observed in connection with this 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.
- Wear protective goggles.
IMPORTANT:
Scrupulous cleanliness is of the utmost importance when working on the fuel rail and injectors. Thoroughly clean the injectors, fuel rail and intake manifold and blow dry with compressed air.
- Remove the fuel rail as described in INJECTORS .
- Fit a transparent hose on the nozzle. This hose should be about 40 cm long and have an inside diameter of 15 mm.
- Place the end of the hose in a receptacle or measuring flask.
- Connect each injector to its connector.
- Start the fuel pump by connecting diagnostics cable 83 93 886 to the upper pin of fuse 8 and the lower pin of fuse 19.
- 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.
- Check the quantity of fuel against the table below.
- Change any defective injectors.
- Fit the fuel rail and injectors.FUEL QUANTITY
Engine type Flow capacity Maximum
permissible
difference
between
injectorsB308E ml/30s 109 4 8 ml