Warning: When checking the operation of the fuel injectors, never put your hands or any part of your body under the jet of fuel coming out of the injector. The fuel exits the nozzle at high pressure and can enter the body through the skin. It is recommended to have a specialist check the pressure injectors.
To determine a faulty injector, you need to make sure that the engine is working and the compression level is the same in all cylinders.
Examination
1. Start the engine and warm it up to normal operating temperature.
2. Loosen the fuel line union nut on the injector to be checked. Note if the engine speed has changed.
3. With a good fuel injector, there will be a clear decrease in engine speed, accompanied by its uneven operation. If the injector being checked is faulty, the change in engine speed will be insignificant and, if present earlier, an extraneous knock will disappear.
4. The presence of a faulty fuel injector is indicated by the following deviations in engine operation:
- omissions in the work of cylinders;
- knocking in one or more cylinders;
- engine overheating;
- reduction in engine power;
- thick black smoke comes out of the exhaust pipe;
- increased fuel consumption;
- blue smoke when starting a cold engine.
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