Checking Injector Flow Capacity (9-5)
CAUTION:
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.
- Remove the fuel rail.
- Fit a transparent hose onto the nozzle. This hose should be about 40 cm long and have an inside diameter of 15 mm. See Fig 1 .
- Place the end of the hose in a receptacle or measuring flask.
- Connect each injector to its proper connector.
- Start the fuel pump by connecting Lead Fault Diagnosis, LH-System Diagnostics Cable (83 93 886) to the upper pin on fuse No. 8 and the lower pin of fuse No. 19.
- Perform a flow capacity test with the diagnostic tool. The diagnostic tool then activates the injector concerned with battery voltage for exactly 30 seconds.
- Check the quantity of fuel against INJECTOR CAPACITY FIGURES .
- Replace any defective injectors. See Fig 2 .
- Attach the fuel rail.
INJECTOR CAPACITY FIGURES
| Engine Type | Flow Capacity (ml / 30 sec.) | Maximum Permissible Difference Between Injectors |
|---|---|---|
| B235E | 176 +/- 7 | 14 ml |
| B205E | 127 +/- 5 | 10 ml |
| B308E | 109 +/- 4 | 8 ml |