Connect the wire to the negative terminal of the battery. Turn on the fuel pump using the jumper switch and make sure that no fuel leaks through the injector nozzles for at least 2 minutes.
Make sure that the fuel injected by the injector has the correct cone shape (pic. 2-188).
Disconnect the air hose connecting the air mass meter to the throttle body. Slightly move the pressure plate of the air flow meter upwards and hold it in this position until then. until a predetermined amount of fuel is poured into one of the beakers selected as the control.
Check the difference in injector performance. The maximum allowable difference in the amount of injected fuel between the injectors, ml:
- at idle with a nominal amount of injected fuel of 20 ml: 2.5;
- at full load at a nominal fuel injection rate of 80 ml: 8.0.
If abnormal, replace the corresponding injector.
More accurately, you can check the technical condition of the nozzles using a stand that includes a hand pump and a pressure gauge.
Connect the injector to be tested to the stand according to the operating instructions and check the fuel injection pressure. For a properly working injector, fuel injection should occur at a pressure of 3.5-4.1 kgf / cm2. Check the tightness of the injector. To do this, using the stand pump, create a pressure of 0.5 kgf / cm2 less than the fuel injection pressure by the injector, and maintain it for 15 s, during which not a single drop of fuel should flow out of the injector atomizer. Press the stand pump lever at a frequency of one stroke per second. In this case, fuel should be sprayed from the injector atomizer with a hum in the form of a cone at an angle of approximately 35°.
If the nozzle does not meet at least one of the above requirements, it must be replaced.
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