Checking injector flow capacity
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Checking injector flow capacity
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Warning
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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:
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Work only in a well-ventilated area! If approved equipment for the extraction of fuel vapours is available, be sure to use it.
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Wear suitable gloves! Prolonged contact with fuel can cause skin irritation or dermatitis.
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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.
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No smoking anywhere in the vicinity.
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Wear protective goggles.
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Important
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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.
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1.
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Remove the fuel rail as described in
or
.
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2.
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Fit a transparent hose on the nozzle. This hose should be about 40 cm long and have an inside diameter of 15 mm.
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3.
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Place the end of the hose in a receptacle measuring flask.
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4.
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Connect the injectors to their respective connectors.
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5.
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Start the fuel pump by connecting the multilead connector, part no. 83 93 886, between the fuel pump fuse no. 8
upper pin
and no. 19
lower pin
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6.
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Carry out the flow capacity check using the diagnostics tool. This tool will activate the injector by supplying electrical power to it for exactly 30 seconds.
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7.
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Check the amount of fuel in the receptacle according to the table below.
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8.
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Change any defective injectors.
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9.
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Fit the fuel rail as instructed in
or, alternatively,
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Engine type
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Flow capacity
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Maximum permissible difference between injectors
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B235E
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ml/30s
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176 ± 7
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ml
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14
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B205E
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ml/30s
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127 ± 5
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ml
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10
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B308E
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ml/30s
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109 ± 4
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ml
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8
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