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Checking injector flow capacity

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 vapours is available, be sure to use it.

• Wear suitable gloves. Prolonged contact with fuel can cause skin irritation or dermatitis.

• Keep a class BE fire extinguisher near at hand. Be mindful of the danger of sparks caused by short circuits and when connecting and disconnecting leads in electrical circuits.

• No smoking anywhere in the vicinity,

• 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.



1. Remove the fuel rail as described in points 1-18 .


2. Fit a transparent hose onto the nozzle. This hose should be about 40 cm long and have an inside diameter of 15 mm.

3. Place the end of the hose in a receptacle or measuring flask.

4. Connect each injector to its proper connector.

5. 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.


6. Perform a flow capacity test with the diagnostic tool. The diagnostic tool then activates the injector concerned with battery voltage for exactly 30 seconds.

7. Check the quantity of fuel against the table below.

8. Change any defective injectors.

9. Fit the fuel rail with injectors, see .

Engine type



Flow capacity



Maximum permissible difference between injectors

B235E

ml/30 s

176±7

ml

18

B205E*

ml/30 s

126±5

ml

13




*Certain B205E engines with tuning kit (190 hp) are fitted with red nozzles. See data for B235E.