Cars with 1.4-/1.6-/2.0-liter petrol engines (except for 1.4 liter E7J engines).
Leaky fuel injectors make it difficult to start a hot engine, cause the engine to run rough and cause misfiring.
1. Start the engine and let it idle.
2. Use a stethoscope and, without turning off the engine, listen to how each injector works. When working, the injector makes a clicking sound caused by the opening and closing of the injector.
If you don't have a stethoscope, you can use a screwdriver or simply put your finger on the nozzle and feel to make sure that the nozzle is working.
If the noise of the working injector is not heard, then you should check the voltage supply to it, as well as its resistance and tightness.
Checking the power supply and resistance of the injector
3. Check the voltage supply to the injector. To do this, disconnect the injector power plugs and connect a control LED to both contacts of the plug. Ask an assistant to operate the starter. The LED should blink.
If the LED light does not blink, then the power supply wire may be broken or the reason for the failure of the injectors may be a defect in the control unit.
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4. Turn off the ignition.
5. Connect an ohmmeter to both contacts of the plug of each injector and measure the resistance of each injector. If the resistance on one of the injectors does not correspond to the nominal values, then this injector should be replaced. The nominal resistance value of the injector is 13.5-15.5 ohms.
Checking the tightness of the injectors
6. Remove the injectors from the fuel distribution line. Do not disconnect the fuel lines and valves from the line.
7. Connect the power wires to the injectors.
8. Place the nozzles in a suitable measuring container.
9. Ask an assistant to operate the starter for a few seconds and compare the shape of the fuel stream from each injector. The fuel stream from each injector should have a cone-shaped shape, which should be the same for all injectors.
10. Turn off the ignition.
11. Disconnect the power wires from the injectors.
12. Turn on the ignition for about 5 seconds. Do not engage the starter.
13. Check the tightness of the injectors. No more than one drop of fuel should flow out of each injector per minute.
14. Install the injectors in place.