- difficult engine start;
- unstable engine operation;
- the engine stalls at idle;
- reduced idle speed of the crankshaft;
- the engine does not develop full power, insufficient engine acceleration;
- failures in the operation of the engine when the car is moving;
- increased fuel consumption;
- increased content of CH in the exhaust gases.
You will need: hex wrench «by 5», flat blade screwdriver, wrench «at 17» (two), autotester.
1. Disconnect the connecting block of the injector wiring harness and the engine harness by depressing the latch.
2. Perform an initial check of the injector windings. To do this, alternately connect an ohmmeter to the contacts of the pads.
Note. Five contacts are installed in the block: four for supplying a control signal to the injectors and one common «+12 V» (a crimson wire with a black stripe is connected to it).
3. Connect the four control pins in turn to the common pin and measure the resistance in each case. It should be 11-15 ohms. If on one or more measurements the resistance value differs from the specified one, the injectors being tested or their wiring harness may be faulty.
4. For a more accurate check and replacement of injectors, remove the fuel rail from the car (see «Removal and installation of the fuel rail»).
5. Pry off the spring clip of the nozzle with a screwdriver..
6.... remove the latch..
7.... and remove the nozzle from the fuel rail. Remove the other injectors in the same way.
8. To identify a faulty injector, connect an ohmmeter to the injector contacts. It should show a resistance of 11-15 ohms. If the winding resistance is not correct, replace the defective injector, as it is not repairable.
Note. Check the nozzle for the shape of the sprayed fuel jet and for leaks at specialized service stations, since such a check directly on the car is very fire hazardous.
Attention! The injectors of the VAZ-21126-00 engine of the VAZ-2170 Lada Priora have an original design and are not interchangeable with injectors of VAZ injection engines of other models. Purchase new nozzles with exactly the same markings.
9. Whenever removing the injectors, be sure to replace the O-rings on all injectors on the rail side. Gently prying with a screwdriver over the edge of the ring..
10.... remove the o-ring from the nozzle..
11.... and similarly remove the ring from the atomizer side.
12. If you are installing the old injectors, carefully wash their nozzles with solvent or carburetor cleaner.
Attention! Install new O-rings carefully, without the use of any tool, after lubricating them with engine oil.
Note. O-rings on the injectors are identical to other rings installed on early VAZ models with fuel injection systems, and are interchangeable with them.
13. Lubricate the O-rings with engine oil or WD-40 before installing the injectors.
14. Install the injectors in the reverse order of removal, fixing them on the ramp with clamps, pre-squeezing them a little.
15. After installing the fuel rail, connecting the fuel line and connecting the wiring harness block, secure the terminal «minus» on the battery, turn the ignition key 3-4 times to the «I» (ignition) at intervals of 2–3 s between switching on and check the tightness of the connection of the pipeline and nozzle seals.
16. Install all removed parts in the reverse order of removal.