Connect the wire to the negative terminal of the battery. Turn on the fuel pump with the jumper switch and make sure that there is no fuel leakage through the injector nozzles for at least 2 minutes.
Make sure that the fuel injected by the injector has the correct cone shape (fig. 2-188).
Disconnect the air hose connecting the air flow meter to the throttle body. Move the pressure disk of the air flow meter slightly upward and hold it in this position until a predetermined amount of fuel flows into one of the measuring cups selected as a control.
Check the difference in injector performance. Maximum permissible difference in the amount of fuel injected between injectors, ml:
- at idle speed with a nominal amount of fuel injected of 20 ml: 2.5;
- at full load with a nominal fuel injection quantity of 80 ml: 8.0.
If there is any deviation from the norm, replace the corresponding injector.
You can more accurately check the technical condition of the injectors using a stand that includes a hand pump and a pressure gauge.
Connect the tested injector to the test bench according to the operating instructions and check the fuel injection pressure. A properly functioning injector should inject fuel at a pressure of 3.5-4.1 kgf/cm². Check the injector for leaks. To do this, use the bench pump to create a pressure 0.5 kgf/cm² less than the injector fuel injection pressure and maintain it for 15 seconds, during which not a single drop of fuel should flow out of the injector sprayer. Press the bench pump lever at a rate of one stroke per second. In this case, fuel should be sprayed from the injector sprayer with a hum in the form of a cone at an angle of approximately 35°.
If the injector does not meet at least one of the above requirements, it must be replaced.
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