- difficult engine start;
- unstable engine operation;
- the engine stalls at idle;
- increased idle speed of the crankshaft;
- the engine does not develop full power, insufficient engine acceleration;
- jerks and failures in the operation of the engine when the car is moving;
- increased fuel consumption;
- increased content of CO and CH in the exhaust gases;
- glow ignition due to leaky nozzles.
To check and replace injectors on a car, you will need: a hex wrench «by 5», screwdriver, wrench «at 17» (two), autotester.
1. Disconnecting the connector of the injector wiring harness and the engine harness (see «Removal and installation of the fuel rail»), carry out an initial check of the injector windings. To do this, alternately connect an ohmmeter to the contacts of the injector connector. The connector has five contacts: four for supplying a control signal to the injectors and one common «masses» (a crimson wire with a black stripe is connected to it). In turn, connect each of the four control contacts of the injectors to a common contact and measure the resistance in each case. It should be equal to 0.011_0.015 kOhm. If the resistance differs from the specified value in one or more measurements, some of the injectors are faulty.
2. For a more accurate check and replacement of injectors, remove the fuel rail from the car (see «Removal and installation of the fuel rail»).
3. Wring out a clamp and disconnect a plait of wires from atomizer.
4. Using a screwdriver, remove the injector spring retainer...
5.... and remove the nozzle from the fuel rail. Remove the remaining injectors from the fuel rail in the same manner.
6. To identify a faulty injector, connect an ohmmeter to the injector contacts. It should show a resistance of 0.011-0.015 kOhm. If the winding resistance is not correct, replace the injector, as it is beyond repair.
7. Whenever removing the injectors, be sure to replace the O-rings on all injectors on the side of the fuel rail...
8.... and O-rings on the side of the intake pipe.
9. If you are installing the old injectors, carefully wash their atomizers with a solvent or carburetor cleaner.
10. Establish on the car of atomizer in an order, the return to removal. Lubricate the O-rings with engine oil before installing the injectors.
11. Having installed the nozzles in the fuel rail, and the fuel rail on the inlet pipe and connecting the pipeline to the fuel rail, start the engine and check the tightness of the connection of the pipeline and nozzle seals.