Reduce the pressure in the fuel system if the engine has just been stopped

Disconnect the wire from the "negative" terminal of the battery.

Remove the receiver.

Loosen the clamps and disconnect the fuel supply hose 1 from the fuel line 3 of the engine.

Checking and replacing injectors

Disconnect the fuel drain hose 4 from the pressure reducing valve.

Disconnect the pads with wires from the connectors 5 of the four injectors.

Checking and replacing injectors

Remove the injector from the engine fuel line. The nozzle is fixed in the opening of the fuel line only with the help of a sealing ring.

Unscrew the two fastening bolts 2 and carefully remove the fuel line 3 of the engine, removing the nozzles from the holes in the intake pipe.

Injectors are fixed in the intake pipe holes only with O-rings.

Install the new injector in reverse order.

Checking the injectors

To check the tightness of the nozzle valve, you need to lower the nozzle of the 1st nozzle into a container with gasoline or kerosene and apply compressed air at a pressure of 0.3 MPa (~ 3 kgf / cm2).

If air bubbles come out of the nozzle atomizer, the nozzle valve is leaking and the nozzle needs to be replaced.

Checking and replacing injectors

To check the health of the injector solenoid winding, apply 12 V DC to the injector connector.

In this case, a characteristic click should be clearly audible, which indicates the opening of the nozzle valve. If this does not happen, then the nozzle is faulty and must be replaced.

This test can be carried out without removing the nozzle from the vehicle.

The resistance of the injector solenoid coil can be checked with an ohmmeter by connecting it to the injector connector pins.

Resistance should be between 15.5-16 ohms. If the resistance value does not fall within the specified limits, replace the nozzle.

Checking the injector without removing it from the engine

To check the health of the injector, turn off the ignition and remove the negative terminal of the battery.

Checking and replacing the engine injectors of a Gazelle carChecking and replacing the engine injectors of a Gazelle car

With an awl or a thin screwdriver, snapping off the spring clip of the shoe

Disconnect the connector from the injector.

Checking and replacing the engine injectors of a Gazelle carChecking and replacing the engine injectors of a Gazelle car

Having connected an ohmmeter to the injector terminals, we measure the resistance of the winding

The winding of a working injector should have a resistance of 15–16 ohms between the central and side pins of the connector

Further tests are carried out on the nozzle removed from the engine.

Removing the nozzle

Relieve the fuel pressure in the fuel system.

Turn off the ignition and remove the "negative" terminal of the battery.

Disconnect the idle speed controller connector.

Remove the inlet air duct and the air damper cable from the throttle pipe (see Replacing the GAZ-3110 pressure reducing valve).

Checking and replacing the engine injectors of a Gazelle carChecking and replacing the engine injectors of a Gazelle car

Use a screwdriver to loosen the clamp of the lower (outlet) hose of the idle speed regulator.

We loosen the clamp with a screwdriver, remove the hose of the crankcase ventilation system.

Checking and replacing the engine injectors of a Gazelle carChecking and replacing the engine injectors of a Gazelle car

Screwdriver which we loosen the clamp, remove the hose of the vacuum brake booster.

Loosen the clamp with a screwdriver, remove the fuel pressure regulator hose.

Checking and replacing the engine injectors of a Gazelle carChecking and replacing the engine injectors of a Gazelle car

Using a 13 key, unscrew the nut that secures the ground wire tip to the first intake manifold stud.

Similarly, disconnect the wire from the last intake manifold stud.

Then, having unscrewed the remaining nuts of the intake manifold studs with a wrench by 13, remove the receiver

Checking and replacing the engine injectors of a Gazelle carChecking and replacing the engine injectors of a Gazelle car

Loosen the clamp with a screwdriver

Remove the supply hose from the fitting of the fuel rail.

Checking and replacing the engine injectors of a Gazelle carChecking and replacing the engine injectors of a Gazelle car

We loosen the clamp with a screwdriver, remove the crankcase ventilation hose from the idling system pipe.

Loosen the clamp with a screwdriver, remove the drain hose from the fitting of the fuel pressure regulator.

Checking and replacing the engine injectors of a Gazelle carChecking and replacing the engine injectors of a Gazelle car

Using a 10 key, we unscrew the two screws securing the fuel rail to the intake manifold and remove the rail

Prying off the spring latch of the block with an awl, disconnect the connector from the injector

Checking and replacing the engine injectors of a Gazelle car

Remove the nozzle from the manifold

Install the nozzle in reverse order

Checking the injector removed from the engine

Checking and replacing the engine injectors of a Gazelle carChecking and replacing the engine injectors of a Gazelle car

When briefly applying voltage from the battery, a distinct click should be heard.

Remove the sealing collar from the nozzle flange and connect the nozzle with a rubber hose with a clamp to a source of compressed air (a compressor with a pressure gauge or a foot pump).

Checking and replacing the engine injectors of a Gazelle car

Having lowered the nozzle sprayer into kerosene, we supply air to it at a pressure of 3 kgf / cm 2.

Checking and replacing the engine injectors of a Gazelle car

For a working nozzle, air should not pass through the atomizer.

Checking the quality of atomization with a fuel injector, for which:

We connect the ground wires that were removed from the intake manifold studs during the removal of the injectors.

Checking and replacing the engine injectors of a Gazelle carChecking and replacing the engine injectors of a Gazelle car

By tightening the nuts with a 13 wrench, we ensure reliable contact with the ground

We put the inlet hose of the fuel rail on the nozzle flange and tighten the clamp with a screwdriver

We connect to the conclusions of the foretwo wires with a length of at least 1 meter.

After making sure that the ignition is off, we connect the "negative" terminal of the battery.

Turn on the ignition and, after waiting for the fuel pump to stop working, turn off the ignition.

Having fixed the nozzle over the container, we connect the wires to the battery terminals for a short time.

Checking and replacing the engine injectors of a Gazelle carChecking and replacing the engine injectors of a Gazelle car

The nozzle should produce a conical jet of finely atomized fuel.

If the nozzle does not work, reverse the polarity of the wires.

Relieve the pressure in the fuel line by applying voltage to the injector. Drain gasoline into a suitable container

We replace the defective nozzle.

Install all parts in reverse order.