How to check the pressure in the fuel system of a VAZ 2107?

How to convert a VAZ 2107 carburetor engine to an injection engine

Some owners of carburetor “classics” independently convert their cars to an injector. Naturally, such work requires a certain amount of experience in auto mechanics, and knowledge in the field of electrical engineering cannot be done here.

What will you need to buy

The kit for converting a carburetor fuel system to an injection system includes:

• electronic control unit;
• gas tank;
• cylinder head (new or used from VAZ 21214);
• receiver;
• ramp with nozzles;
• fuel pump assembly;
• fuel filter;
• fuel line with rubber hoses;
• throttle assembly;
• accelerator pedal with cable;
• air filter assembly with sleeves;
• front engine cover;
• crankshaft pulley;
• ignition module;
• sensors for mass air flow, damper position, detonation, coolant temperature, oxygen concentration, crankshaft position, detonation;
• high voltage wires;
• harnesses, cables, wires, terminals, thermal casings;
• brackets.

The cost of all these elements is about 30 thousand rubles. The electronic control unit alone costs approximately 5–7 thousand. But costs can be significantly reduced if you buy used parts rather than new ones.

Conversion stages

The entire engine tuning process can be divided into the following stages:

1. Removing all attachments: carburetor, air filter, intake and exhaust manifolds, distributor and ignition coil.
2. Removing wiring and fuel lines. To avoid confusion when laying new wires, it is better to remove the old ones. The same should be done with the fuel pipes.
3. Replacing the fuel tank.
4. Replacing the cylinder head. You can, of course, leave the old “head”, but in this case you will have to bore the inlet windows, as well as drill holes and tap them for the receiver mounting studs.
5. Replacing the front engine cover and crankshaft pulley. In place of the old cover, a new one is installed with a shimmer for the crankshaft position sensor. At this stage, the pulley also changes.
6. Installation of the electronic control unit, ignition module.
7. Laying a new fuel line with the installation of a return line, a fuel pump and a filter. The accelerator pedal and its cable are also replaced here.
8. Installation of ramp, receiver, air filter.
9. Installation of sensors.
10. Laying wiring, connecting sensors and checking the functionality of the system.

It’s up to you to decide whether it’s worth spending time and money on conversion, but it’s probably much easier to buy a new injection engine, which costs about 60 thousand rubles. All that remains is to install it on your car, replace the gas tank and lay the fuel line.

Despite the fact that the design of an engine with an injection power system is much more complicated than a carburetor, it is very repairable. If you have at least a little experience and the necessary tools, you can easily restore its functionality without the involvement of specialists.

Possible consequences of long starter operation

When the starter is turned for a long time, the greatest damage is caused to the battery and starter. The first one loses its charge very quickly. When starting the engine, the starter consumes a lot of current, so the battery consumes most of its charge, which is then (after the engine has been started) replenished by charging from the generator.

Bendix failure

Old and new Bendix

With each such idle start, voltage from the battery is supplied to the bendix, which begins to rotate the shaft until the engine starts. At this moment, the splines on the bendix are severely worn out, and the bearing may also crumble or hum.

In these cases, there is only one way out - replacing the starter with a new one.

Mechanical problems

First, you should check the throttle cable. Quite often it jams, and the pedal “sticks” when the driver has already removed his foot and the speed has not decreased. This may be due to the following problems:

• Corrosion of the cable
  . At the same time, it simply gets stuck in the shirt;
• Lubrication
  . Sometimes drivers, in an effort to improve the operation of the unit, lubricate the cable; in winter, the lubricant freezes, which causes jamming;
• Unsuccessful repair
  . In some cases, after repairs, car owners incorrectly position the cable, resulting in problems.

Therefore, be sure to check the condition of the cable. See how it moves and replace it if necessary.

Additional designations

The fuses of the VAZ 2107 car are located as follows:

• taillights and reversing lights;
• electric motor of the heater fan, headlight washer and glass wiper pumps;
• indicator for turning on the rear window heater VAZ 2107;
• direction indicators and hazard warning relays;
• fog lights;
• tachometer, voltmeter;
• control lamps for oil pressure, fluid, fuel level and reserve indicators on the instrument panel, instrument panel lighting;
• cigarette lighter and clock;
• VAZ sound signal;
• interior lighting (up to 2000 there was one lamp on the ceiling, for those manufactured after 2000 there were two lamps on the rear door pillars);
• high beam headlights;
• high beam warning lamp;
• engine compartment lighting and license plate lighting;
• glove compartment lighting;
• right headlight;
• left headlight.

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Diagnostics

The very first thing when diagnosing, as noted above, listen when you turn on the ignition to see if there is any noise from the fuel pump. The absence of a characteristic buzzing may indicate that:

• VAZ 2107 fuel pump fuse is faulty;
• relay malfunction;
• open circuit of the fuel pump;
• motor malfunction;
• ECU malfunction.

Below is a simplified connection diagram for a VAZ 2107 injector fuel pump:

You can check the fuel pump on a VAZ 2107 injector simply by checking the voltage at its connection block with a tester. The presence of voltage will indicate a malfunction of the electric motor. Instead of a tester (multimeter), you can use a test lamp to diagnose a malfunction.

In the absence of one, this can be done by disconnecting the connection block for the fuel pump and fuel level control and applying voltage with wires from the battery to the place where the gray wire is connected +12 and to the place where the black wire is connected - minus. A humming pump will indicate a faulty fuse, power circuit or ECU.

How to find a fault

You need to look for the cause of a fuel system malfunction in two directions: electrical and mechanical. The first option is diagnostics of sensors and their electrical circuits. The second is to check the pressure in the system, which will show how the fuel pump works and how gasoline flows to the injectors.

Error codes

It is recommended to start searching for any breakdown in an injection car by reading the error code issued by the electronic control unit, because most of the listed power system faults will be accompanied by a “CHECK” light on the dashboard. To do this, you can contact a service station, or carry out diagnostics yourself if you have a scanner designed for this. The table below shows error codes in the operation of the VAZ 2107 fuel system with their interpretation.

Table: error codes and their meaning

Checking the rail pressure

As mentioned above, the operating pressure in the power system of the injection “seven” should be 2.8–3.2 bar. You can check whether it corresponds to these values ​​using a special liquid pressure gauge. The device is connected to a fitting located on the fuel rail. Measurements are taken with the ignition on without starting the engine and with the power unit running. If the pressure is less than normal, the problem should be looked for in the fuel pump or fuel filter. It is also worth inspecting the fuel line pipes. They may be damaged or pinched.

A special liquid pressure gauge is used to check the pressure