Checking injector flow capacity (B235R)
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Checking injector flow capacity (B235R)
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Warning
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This check involves partial dismantling of the car's fuel system. The following points must therefore be observed in connection with the 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 close at hand! Beware 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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Important
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The utmost cleanliness must be observed when handling the fuel rails and injectors. Wash around the injectors, fuel rail and intake manifold and dry with compressed air.
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1.
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Remove the fuel rail as described in
.
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2.
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Attach the fuel connections to the fuel rail.
Fit a transparent hose to the nozzle. The hose should be approx. 40 cm long with an inner diameter of 15 mm.
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3.
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Direct the hose into a receptacle/measuring glass.
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4.
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Plug in the connectors to their respective injectors.
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5.
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Start the fuel pump by connecting jumper cable no. 83 93 886 between fuel pump fuse no. 32,
bottom pin
, and luggage compartment lighting fuse no. 4,
top pin
.
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6.
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Conduct the flow capacity test using the diagnostic tool. The diagnostic tool will then activate the injector in question with battery voltage for exactly 30 s.
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7.
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After
30
seconds, the amount of fuel should be
176 +/- 7 ml
.
The difference between injectors must not exceed
14 ml
.
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8.
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Change any defective injectors.
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9.
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Detach the fuel connections from the fuel rail and fit the fuel rail as described in
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