VAZ 2107 engine: description, characteristics and tuning

The VAZ-2107 car was produced from 1982 to 2014.
Here are colored wiring diagrams (for the injector and carburetor) with a description of all the elements for various modifications. The information is intended for self-repair of cars. Electrical circuits are divided into several blocks for ease of viewing via a computer or phone; there are also circuits in the form of a single picture with a description of each element - for printing on a printer. The “sevens”, like most modern cars, use a single-wire circuit for supplying electricity to electrical equipment. The other terminal of the consumer is always connected to the ground of the machine to which the negative terminal of the battery is connected. This solution allows not only to simplify the design of the on-board network, but also to slow down corrosion.

Symptoms of a problem

A mixture misfire is a failure to ignite the fuel-air mixture or its untimely ignition. In any of the cases, the system counts the number of misses and delays, and, if necessary, turns off the idle cylinder or even a pair. On most cars, the first sign of a malfunction is the “check” symbol lighting up on the dashboard.

Also among the common signs can be noted:

Smell of fuel from the exhaust pipe. Since the mixture did not ignite in the cylinder, it is discharged almost unchanged or partially neutralized.
Shoots in the exhaust system. If a partial fire occurs, the catalytic converter is severely damaged, which can lead to popping noises.
Loss of power. The engine does not work properly, causing the crankshaft to spin at a lower speed, resulting in a significant loss of power.
Engine tripping. Failure of one or a pair of cylinders leads to the fact that the engine begins to vibrate during operation and other signs of malfunction appear.

In cars with an electronic control unit, there are several types of errors that indicate a breakdown.

P0300. It is a sign of multiple failures in the process of ignition of the combustible mixture in different cylinders.
P0301 - p0304. The last number shows which cylinder is not working properly.

What metal is a car engine made of?

Each car has its own characteristics and power requirements, so the engine installed in it is selected individually. It is possible to determine which metal is used in the engine if it is dismantled and disassembled. Old engines sitting in a garage or salvaged cars are usually suitable for only one purpose - to sell the internal combustion engine for scrap. Do you want to know what metal is in the engine block to represent profit? Let's figure out what metal car engines are made of and what value they represent.

VAZ 21074 engine control system diagram

Wiring diagram of electrical connections of ECM VAZ 21074 - circuit elements. 1 — controller connector; 2 — mass air flow sensor; 3 — coolant temperature sensor; 4 — crankshaft position sensor; 5 — throttle position sensor; 6 — oxygen concentration sensor; 7 — speed sensor; 8 — ignition module; 9 — solenoid valve for purge of the adsorber; 10 — electric fan relay; 11 — electric fuel pump relay; 12 - main relay; 13 - fuse for the power circuit of the electric fuel pump relay: 14 - fuse for the power circuit of the main relay; 15 — fuse-link; 16-fuse protecting the constant power supply circuit of the controller; 17 - diode; 18 — idle speed regulator; 19 — nozzles; X1 - diagnostic block; X2 - connection block to the vehicle electrical system.

Characteristics of oils for VAZ

The service life of the engine depends on the correct selection of oil for injection VAZ 2107. The recommended quality standard for the lubricating fluid is given by the manufacturer. Any type of oil that meets API SJ/CF, SG/CD quality standards can be filled into the car.

The abbreviation API means that a lubricant meets the following basic criteria:

cleaning properties;
temperature regime;
indicator of deposits on engine components before the first oil change;
release of harmful substances;
corrosive properties;
effectiveness of protecting components from friction.

It is recommended to use the following types of oils.

Oil brand for VAZ	SAE viscosity groups	API standard
RAVENOL LLO	10W-40	SJ/CF
SHELL HELIX SUPER	10W-40	SG/CD
TNK SUPER OIL	5W-40, 10W-40, 15W-40, 20W-40	SG/CD
TOTAL QUARTZ	5W-40, 10W-40	SL/SF
MOBIL SUPER M	15W-40	SJ/CF
LUKOIL LUX	5W-40, 10W-40, 15W-40	SJ/CF-4
NOVOIL-SINT	5W30	SG/CD
CONSOL	5W-40, 10W-40, 15W-40	SG/CD
BIZOL GREEN OIL	10W-40	SL/SF
ESSO ULTRA	10W-40	SJ/CD
LUKOIL SUPER	5W-40, 10W-40, 15W-40, 10W-30	CF-4/SG
RAVENOL SUPER HD	15W-40	SJ/CF
LUKOIL SUPER	5W-30, 5W-40, 10W-40, 15W-40	SG/CD
ANGROL-SUPER	5W30, 5W-40, 10W-40	SG/CD
LUX	5W30, 5W-40,10W-30, 10W-40, 15W-40, 20W-40	SG/CD
ESSO UNIFLO	10W-40, 15W-40	SJ/CD

Wiring harness in the cabin

In the interior of the VAZ 21074 there are wiring harnesses:

under the instrument panel. This bundle contains the wires responsible for the headlights, direction indicators, instrument panel, and interior lighting;
stretched from the fuse box to the rear of the car. The wires of this bundle power the rear lights, glass heater, and gasoline level sensor.

The wires that are used in the “seven” for electrical connections are of the PVA type and have a cross-section from 0.75 to 16 mm2. The number of copper wires from which the wires are twisted can range from 19 to 84. The wiring insulation is made on the basis of polyvinyl chloride, which is resistant to temperature overloads and chemical influences.

The wiring harness under the instrument panel of the VAZ 21074 contains wires that are responsible for the headlights, direction indicators, instrument panel, and interior lighting.

To simplify the repair, maintenance and replacement of electrical equipment, the factory electrical wiring of VAZ 21074 vehicles has a set color.

Table: cross-section and color of wiring of the most important electrical appliances VAZ 21074

Electrical circuit section	Wire cross-section, mm2	Insulation color
minus battery - body mass	16	black
starter plus - battery	16	red
plus generator - battery	6	black
generator—black connector	6	black
terminal “30” of the generator—white block MB	4	pink
terminal “50” starter—starter start relay	4	red
Starter start relay—black connector	4	brown
ignition relay—black connector	4	blue
terminal “50” of the ignition switch—blue connector	4	red
terminal “30” of the ignition switch—green connector	4	pink
right headlight connector - ground	2,5	black
left headlight connector—blue connector	2,5	green (gray)
terminal “15” of the generator—yellow connector	2,5	orange
Radiator fan ED - “ground”	2,5	black
Radiator fan ED—red connector	2,5	blue
contact “30/1” of the ignition switch—ignition relay	2,5	brown
pin “15” of the ignition switch—single-pin connector	2,5	blue
cigarette lighter—blue connector	1,5	blue (red)

Non-ferrous metal in the engine. Is it possible to submit?

All non-ferrous metal contained in the engine can be returned at a profit if you contact a specialized collection point. Not every acceptance facility has a manipulator available, so not all organizations are able to load, transport and weigh an internal combustion engine, which can weigh up to 200 kilograms. The non-ferrous metal will not accept the entire engine, but only some of its components, which are made of non-ferrous alloys. Usually, entire engines are accepted as ferrous scrap metal, so it is better to disassemble the unit in advance and separate the parts from non-ferrous scrap. In Moscow and the Moscow region, you can hand over an old car engine at a good price. For example, VtorBaza buys scrap motor aluminum (at a price of 90-118 rubles/kg), and you can also hand over cast iron from the cylinder block of your car’s internal combustion engine. This reception point has all the necessary special equipment, loaders and trucks. helps with organizing transportation, weighing, disassembling and evaluating the engine, with its subsequent purchase. At the same time, the price for all ferrous and non-ferrous metals accepted at acceptance is higher than in other points in the region.

What generators can be installed on the “seven”

The design of the VAZ 2107 allows the installation of not only the G-221A generator. Therefore, if necessary, the driver can install a more powerful device, however, this will require making some changes to the electrical circuit of the car. The question arises: what is the reason for the desire of a car enthusiast to change his “native” generator?

The G-221A was the optimal device for equipping cars at the beginning of their mass production. However, a lot of time has passed since the 1980s and today almost every driver uses modern electronic devices:

acoustic system;
navigators;
additional lighting devices (tuning), etc.

Accordingly, the G-221A generator cannot cope with high loads, which is why drivers begin to look for more powerful units.

You can install at least three more powerful devices on the “seven”:

G-222 (generator from Lada Niva);
G-2108 (generator from the G8);
G-2107–3701010 (injection model for a carburetor car).

It is important that the last two models do not require changes in the design of either the generator housing or its mountings. When installing a generator from Niva, you will have to make some modifications

Connection diagram G-221A

Being an electronic device, the generator needs to be used correctly. Therefore, its connection diagram should not cause ambiguity. It should be noted that drivers of “sevens” can usually easily connect all the generator terminals themselves, since the circuit is accessible and understandable to everyone.

The generator (item 2) is connected to the circuit in series between the battery (item 1) and the mounting block (item 3)

Many car owners wonder where which wire should be connected when replacing the generator. The fact is that the device has several connectors and wires, and when replacing, you can easily forget which wire goes where:

orange is not useful for connection, it can be left as is or connected to gray directly to autostart the car;
a gray thick wire goes to the brushes from the relay regulator;
a gray thin wire connects to the relay;
yellow - coordinator of the control light on the control panel.

When working independently with the G-221A, it is better to sign the purpose of the wires so as not to connect them by mistake later.

To avoid errors, all wires have their own color designation

Damage diagnostics

How to understand that an injector needs to be replaced, checked or repaired? Even without sensors, you can understand that repair of fuel system elements is required if there are 1 of 2 main signs in models 2107, 21074:

Unstable engine operation. Sometimes it may stall or have difficulty starting.
A much less obvious sign is loss of power. This effect is noticeable if you mostly drive at medium speeds, but at high speeds it is very noticeable.
The last sign is recorded only by sensors - the pressure inside the system increases.

The cause of such failures is clogged injectors; even diagnostics are not needed. Cleaning helps restore the engine to its original performance. If the problem has not been resolved after cleaning, it is worth checking the tubes and injectors for damage or breakdowns. In such cases, it is better not to start repairs, but simply replace the damaged parts with new ones.

Sometimes it is impossible to determine on your own where the damage is, and only then will diagnostics at service centers come in handy. A blockage can cause quite serious damage to the VAZ 2107 injector, as well as rupture of channels. The pressure that arises inside the system can easily destroy the most fragile parts. Here you won’t be able to fix the situation with your own hands, even if you have a complete diagram of the car at hand. There is only one conclusion - you need to devote a lot of time and attention to cleaning injectors and do it regularly.

Explanation of symbols

1 – radiator fan drive motor;
2 – mounting block block;
3 — idle speed sensor;
4 – engine ECU;
5 – potentiometer;
6 – set of spark plugs;
7 – ignition control unit;
8 – electronic crankshaft position sensor;
9 – electric fuel pump;
10 – indicator of the number of revolutions;
11 – lamp for monitoring the health of electronic systems and the brake system;
12 – ignition system control relay;
13 – speedometer sensor;
14 – special factory connector for reading errors using the BC;
15 – injector harness;
16 – adsorber solenoid valve;
17, 18, 19,20 – fuse box for repairing the mounting block that protects the injection system circuits;
21 – electronic fuel pump control relay;
22 – electronic relay for controlling the exhaust manifold heating system;
23 – exhaust manifold heating system;
24 – fuse protecting the heater circuit;
25 – electronic air sensor;
26 – coolant temperature control sensor;
27 – electronic air damper sensor;
28 – air temperature sensor;
29 – pressure control sensor and low oil pressure lamp.

General diagram of the electrical equipment of the VAZ 21074 injector

1. Electrical connection diagram of the wiring harness of the instrument panel assembly LADA 21074

— ignition switch unloading relay;
— relay-interrupter of direction indicators;
— windshield wiper relay;
— brake signal switch;
— switch for headlights and direction indicators;
— windshield wiper and washer switch;
— ignition switch;
- hazard warning switch;
— instrument cluster;
— rear window heating switch;
— rear fog light switch;
— external lighting switch;
— heater motor switch;
— additional resistor for the heater electric motor;
— heater electric motor;
— indicator lamp for heated rear window;
— brake fluid level warning lamp;
— instrument lighting switch;
- cigarette lighter;
- watch;
- reverse light switch;
— hand brake sensor;
— rear fog light relay;
— block of the instrument panel harness to the ignition system harness;
— glove box lighting;
— mounting block.

A1, A2 - grounding points of the instrument panel wiring harness. A3 - grounding points for the heater motor.

2.Electrical connection diagram of ECM LADA 21074 injector

1 - controller; 2 — diagnostic oxygen concentration sensor; 3 — block of the ignition system harness to the right mudguard harness; 4 — block of the fuel level harness to the ignition system harness; 5 and 7 — electrical fuel pump harness pads; 6 — control oxygen concentration sensor; 8 — electric fuel pump; 9 — diagnostic block; 10 — speed sensor; 11 — idle speed regulator; 12 — throttle position sensor; 13 — coolant temperature sensor; 14 — mass air flow sensor; 15 — crankshaft position sensor; 16 — solenoid valve for purge of the adsorber; 17 — ignition coil; 18 — spark plugs; 19 — nozzles; 20 — block of the ignition system harness to the instrument panel harness; 21 — controller power supply fuse; 22 — ignition relay; 23 - ignition relay fuse; 24 — fuse for the electric fuel pump power supply circuit; 25 — electric fuel pump relay; 26 — block of the ignition system harness to the injector harness; 27 — injector harness block to the ignition system harness; A - to the “plus” terminal of the battery; B1 — grounding point of the fuel level sensor harness; B2, ВЗ — grounding point of the ignition system harness; 21074-3724026 — ignition system harness

3. Electrical connection diagram of the wiring harness of the right mudguard assembly LADA 21074.

— mounting block;
— block of the right mudguard harness to the left mudguard harness;
— right side turn signal;
- right headlight;
— additional starter relay;
— windshield washer pump;
— blocks of the right mudguard harness and connecting starter wires;
— starter;
— rechargeable battery;
— generator.

A1 is the grounding point for the right mudguard wiring harness. A2, A3 - grounding points of the connecting motor wire with the battery and housing.

4. Electrical connection diagram of the left mudguard assembly wiring harness LADA 21074.

— mounting block;
— block of the left mudguard harness to the right mudguard harness;
- left headlight;
— left side turn signal;
— oil pressure warning lamp sensor;
— coolant temperature sensor;
— brake fluid level sensor;
— electric motor of the windshield wiper;
- sound signal;
— engine electric fan.

A1, A2 - grounding points of the left mudguard wiring harness.

5. Electrical connection diagram of the flat rear wiring harness assembly for LADA 21074.

— mounting block;
— flat rear harness block to the ignition system harness;
— right front door lamp switch;
— right rear door lamp switch;
— left front door lamp switch;
— left rear door lamp switch;
— right interior lamp;
— left interior lamp;
— electric fuel pump with fuel level indicator sensor;
— rear window heating element;
— additional brake signal;
— right lamp;
— left lamp;
— left license plate light;
— right license plate light.

A1 is the grounding point for the rear window heating element. A2 is the grounding point for the license plate light ground harness. A3 - A8 - grounding points of the flat rear wiring harness assembly.

Source

VAZ-2107 diagram

The “sevens”, like most modern cars, use a single-wire circuit for supplying electricity to electrical equipment. The other terminal of the consumer is always connected to the ground of the machine to which the negative terminal of the battery is connected. This solution allows not only to simplify the design of the on-board network, but also to slow down corrosion.

Calibration data for DAAZ 2107 jets - table

Accurate dosing of the mixture of gasoline and air is carried out by jets. There are several types installed in any carburetor. Knowing the characteristics and location of parts is useful when servicing the device and adjusting its settings.

If we consider the VAZ 2107: the carburetor is equipped with the following types of jets:

Characteristics of VAZ 2107

Performance indicators	Meaning
Maximum speed, km/h	150
Fuel consumption l:
City	9,6
Route	6,9
Mixed	8
Euro toxicity standard	Euro 2
Engine
Power unit volume, cm3	1451
Fuel type	petrol
Number and arrangement of cylinders	4/R
Supply system	Distributive injection
Number of valves	8
Maximum torque, N*m at rpm	115 at 3450
Maximum power, hp	71
Transmission
Transmission type	Mechanical
Number of steps	5
type of drive	Rear
Suspension
Front suspension device	Independent multi-link
Rear suspension device	Dependent, on coil springs
Front brake mechanism	Disk
Rear brake mechanism	Drum

Initially, the seven was equipped with an engine with a capacity of 1.5 liters, but during the production process the power range was expanded.

Modifications of engines installed on the VAZ 2107.

Options	Model range of VAZ engines
2103	2104	2106	21067	21067-20
Cylinder diameter, piston stroke	76 80	76 80	79 80	79 80	79 20
Working volume	1,5	1,5	1,6	1,6	1,6
Compression ratio	8,5	8,5	8,5	8,5	8,5
Supply system	carburetor	Distributive injection	carburetor	Distributive injection	Distributive injection
Rated power, kW	52,5	52,5	54,8	54,5	53,5
Rated speed	5600	5000	5600	5000	5300
Fuel brand	(AI-92)	(AI-92)	(AI-92)	(AI-92)	(AI-95)
Spark plug	A17DVR, FE65CPR, A17DV-10	А17ДВРМ, BRISR, SUPER, LR 15YC	A17DVR, FE65CPR, A17DV-10	А17ДВРМ, BRISR, SUPER, LR 15YC	А17ДВРМ, BRISR, SUPER, LR 15YC
Toxicity standard	Euro-0	Euro 2	Euro-0	Euro 2	Euro-3

About first generation LADA 2107 engines (1975 - 2005)

The VAZ 2107, popularly called the “Seven,” is a popular and latest rear-wheel drive classic sedan model produced by AvtoVAZ. In essence, this is a modified VAZ 2105, only more comfortable, with engines of greater power and volume. Over time, these models were replaced by Lada Granta cars. We will look at what engines the VAZ 2107 cars were equipped with, their characteristics and main problems.

ENGINE VAZ 2101

The VAZ 2101 engine is the base engine in relation to the classic VAZ family. There is an opinion that this is a Fiat engine, there is some truth in this, since the VAZ 2101 was created on the basis of the FIAT 124 prototype. Unlike this prototype, the VAZ 2101 had an increased center-to-center distance, which made it possible to create variants with different displacements from 1.3 l. up to 1.8 l. The engine is in-line, with 4 cylinders, the camshaft is overhead, the timing drive is on a chain. Owners of models 1970-1974 note the significant reliability of the engines, the reason is most likely in the control of production by Fiat professionals.

The main problem of the engine can be called increased wear of the camshaft. The engine requires periodic valve adjustment. In addition, it is necessary to regularly clean the carburetor. The engine consumes a lot of oil and is prone to overheating. This can happen if the fan fails or the pump breaks. The engine may smoke, the problem may be in the piston rings. Problems with seals and valve bushings are not uncommon. The engine may stall and the problem is most often a faulty ignition system. These are the main, but not all, problems of the engine.

When thinking about tuning the VAZ 2101 engine, you need to understand that the engine has a large number of problems and generally wears out easily, because of this it will not be possible to attach a large number of additions to it. First of all, tuning the VAZ 2101 involves increasing the working volume. To do this, you will have to increase the piston stroke, change the crankshaft and bore the engine. In addition, you can consider the possibility of eliminating roughness and polishing the cylinder head channels. You can install a compressor. There are several ready-made installation kits on the market. However, it must be remembered that with this approach it is very likely that the engine life will be reduced.

ENGINE VAZ 2103

VAZ 2103 is an in-line carburetor-type engine, it has 4 cylinders and an overhead camshaft, and a chain drive. Compared to the VAZ 2101, the VAZ 2103 has a taller block and a crankshaft with an increased piston stroke.

The engine's crankshaft wears out quickly. In addition, it is necessary to timely adjust the timing chain and adjust the valves. In addition, the carburetor must be cleaned regularly. VAZ 2103 engines are prone to overheating, most often due to problems with the pump. The engine may stall due to a burnt-out valve; in this case, the car must be shown to specialists. In general, it would be fair to say that the VAZ 2101 and VAZ 2103 engines repeat each other in terms of problems. At the same time, according to user reviews, the VAZ 2103 engine is more reliable and unpretentious compared to the 2101.

The easiest and most affordable way to increase the power of a VAZ 2103 engine is by boring the cylinders and increasing the piston stroke, as well as installing a suitable crankshaft. Another option is to bore the engine and fine-tune the cylinder head. Finally, you can increase engine power by installing a turbine or compressor, but this is the most expensive method.

ENGINE VAZ 2105

The VAZ 2105 engine is an analogue of the 21011, with slightly less power and a timing belt drive. Due to the use of a belt, the engine makes less noise. In addition, it should be noted that the 2105 engine does not bend the valves. At the same time, it is necessary to periodically adjust the valve clearances.

Without preheating, the engine often stalls, possibly due to oil thickening. Therefore, it is necessary to pre-warm the engine. Often the VAZ 2105 engine jams, to avoid this, it is necessary to change the oil in a timely manner. If knocking noises occur in the engine, it means the valves need to be adjusted. Otherwise, engine power will decrease, valve burnout is possible, the camshaft may become unbalanced, and fuel consumption will increase. In general, the problems of the VAZ 2105 engine are similar to faults 2101 and 21011.

Increasing the power of the VAZ 2105 engine is possible through a bore for an 82mm piston. In addition, the tuning possibilities are similar to those for the VAZ 2101 engine.

ENGINE VAZ 2106

The VAZ 2106 engine is a logical continuation of the ideas embedded in the VAZ 2103 engine. The main difference between the engines is the change in piston diameter. There is a variation of the engine with index 21067, this is an injection-type gear engine. However, it should be noted that the carburetor in this case is more reliable than the injector. The VAZ 2106 engine has 4 cylinders and an overhead camshaft; the timing drive uses a chain.

The VAZ 2106 engine is less reliable compared to the 2103, and requires pre-warming for reliable starting. The following problems are most typical for the engine. The need to use high-quality oil and replace it in a timely manner. The engine is also quite voracious in terms of oil consumption. In addition, the crankshaft wears out quite quickly. If there is a knocking noise in the engine, this indicates that it is time to adjust the valves. In addition to knocking, characteristic metallic sounds may occur; the problem is most likely in the piston pins or connecting rod bearings; the problem itself can be solved in a service center. In general, various suspicious noises and knocks are characteristic of the VAZ2106. Uneven operation of the engine indicates that the carburetor jets are clogged. The engine often overheats, and the cause may be problems with the thermostat or radiator. In addition, the engine is characterized by tripping, vibration, and engine wedge.

The simplest way to increase the power of a VAZ 2106 engine is to bore and increase the piston stroke. In addition, some craftsmen install an engine from a Priora, this is a rather complicated process, but reliable in terms of increasing power. Finally, if funds allow, you can start installing a turbine.

Diagnostic connector

The ECU on the “Seven”, like on other cars, is also equipped with a diagnostic connector. Today, all connectors are manufactured according to the same OBD2 standard. That is, the “on-board vehicle” can be checked for errors and malfunctions using a conventional scanner with a standard cord.

The device for connecting the scanner to the ECU on a VAZ 2107 is compact in size

What is it used for?

The OBD2 diagnostic connector is equipped with a certain number of contacts, each of which performs its own function. By connecting the scanner to the ECU connector, you can carry out several diagnostic modes at once with high accuracy:

view and decipher error codes;
study the characteristics of each system;
clear “unnecessary” information in the ECU;
analyze the operation of car sensors;
connect to execution mechanisms and find out their remaining resource;
View system performance and saved data about previous errors.

A scanner connected to the diagnostic connector instantly identifies all errors in the operation of the ECU and deciphers them to the driver

Where is

The diagnostic connector on the VAZ 2107 is located in the most convenient place for work - under the glove compartment in the cabin under the instrument panel. Thus, there is no need to disassemble the engine compartment mechanisms in order to connect the scanner to the ECU.

Opening the glove compartment, you can see the ECU diagnostic connector on the left side

Causes of injector clogging

Typically, problems with the injection system occur when using low-quality gasoline. Heavy paraffins contained in such fuel settle on the walls of the system, cutting off the fuel supply. Manufacturers of high-quality gasoline add detergent to it - a special additive that dissolves deposits. Low-quality gasoline contains too much paraffin, which forms deposits faster than detergents can remove them.

Deposits form more intensively at low temperatures, so when the car is frequently driven with a cold engine, the injector becomes clogged more often.

Deposits can accumulate not only in the injectors. Often vapors settle on the throttle valve, which leads to a change in the proportions of the air-fuel mixture entering the cylinders.

Deposits of substances contained in low-quality gasoline may also appear on the back of the intake valve plates. This can lead to valve burnout or fuel detonation.

To clean the injection system of deposits, it is necessary to use special flushing fluid and equipment. You can wash the injector in a garage. To do this, you need a syringe and washing liquid. The latter is mixed with gasoline and poured into the injection system through the hose of the vacuum brake booster. First, the operation is performed with the engine turned off, then with the engine running. The mixture is fed into the running engine gradually, in small portions. As a result, the deposits dissolve, enter the engine cylinders and burn there. In this case, clouds of smoke may briefly appear coming out of the muffler.

The principle of operation of the carburetor

The functioning of the power unit is largely determined by the quantity and quality of the incoming fuel mixture.

How the 2107 carburetor works:

Fuel enters the float chamber, the level of which is regulated by a valve or float. After this, the gasoline, divided into droplets, enters the mixing chamber through nozzles, where mixing with the air occurs. The econostat further enriches the mixture when the engine is running at full load. Diffusers optimize the flow of fuel, which is supplied to the manifold through the throttle valves. When the engine runs at high speeds, the accelerator pump turns on.

Electrical diagram of VAZ 21074

In VAZ 21074 cars, electrical energy is delivered to consumers using a single-wire circuit: the “positive” terminal of each electrical device is powered from a source, the “negative” terminal is connected to “ground,” i.e., connected to the vehicle body. This solution simplifies the repair of electrical equipment and slows down the corrosion process. All electrical appliances of the car are powered from the battery (with the engine off) or the generator (with the engine running).

The wiring diagram of the VAZ 21074 injector contains an ECM, an electric fuel pump, injectors, and engine control sensors

Wiring diagram VAZ 21074 injector

The injection versions of the “Seven” released from the factory assembly line have the following indices:

LADA 2107–20 - in accordance with the Euro-2 standard;
LADA 2107–71 - for the Chinese market;
LADA-21074–20 (Euro-2);
LADA-21074–30 (Euro-3).

The injection modifications of the VAZ 2107 and VAZ 21074 use an ECM (electronic engine control system), an electric fuel pump, injectors, control sensors and monitoring engine parameters. As a result, there was a need for additional under-hood and interior wiring. In addition, the VAZ 2107 and VAZ 21074 are equipped with an additional relay and fuse box located under the glove compartment. The additional unit is supplied with wiring that supplies:

fuses: main relay power circuits;
controller constant power supply circuits;
electric fuel pump relay circuits;

relay:

The main thing;

fuel pump;

electric fan;

diagnostic connector.

Additional fuse and relay block VAZ 2107 injector located under the glove compartment

Providing electricity

The G7 is responsible for providing consumers with electricity:

Battery voltage 12 V, capacity 55 Ah;
generator type G-222 or 37.3701;
voltage regulator Ya112V, which automatically maintains the voltage within 13.6–14.7 V.

Diagram of the power supply system for the VAZ 21074 injector includes a generator, battery and voltage regulator

Engine starting

The starting system in the VAZ 21074 is a starter and ignition switch powered from the battery. There are two relays in the starter circuit:

auxiliary, which supplies power to the starter terminals;
retractor, due to which the starter shaft engages with the flywheel.

The starting system in the VAZ 21074 is a battery-powered starter with a relay and an ignition switch.

Ignition system

In early versions of the seventh VAZ model, a contact ignition system was used, which included:

ignition coil;
distributor with contact breaker;
spark plug;
high voltage wiring.

The VAZ 21074 contact ignition system consists of a coil, distributor, spark plugs and high-voltage wires

In 1989, the so-called contactless ignition system appeared, the circuit of which included:

Spark plug.
Distributor.
Screen.
Hall Sensor.
Electronic switch.
Ignition coil.
Mounting block.
Relay block.
Key and ignition lock.

In 1989, a contactless ignition system appeared, to the circuit of which a Hall sensor and an electronic switch were added

“Sevens” with injection engines use a more modern ignition circuit. The operation of this circuit is based on the fact that signals from the sensors are sent to the ECU (electronic control unit), which, based on the received data, generates electrical impulses and transmits them to a special module. After this, the voltage increases to the required value and is supplied to the spark plugs through high-voltage cables.

In injection "sevens" the operation of the ignition system is controlled by the electronic control unit of the ECU

Outdoor Lighting

The external lighting system includes:

Block headlights with dimensions.
Illumination of the engine compartment.
Mounting block.
Glove compartment lighting.
Instrument lighting switch.
Rear lights with dimensions.
Illuminated numbers.
Exterior lamp switch.
External lighting indicator lamp (in the speedometer).
Ignition.

The VAZ 21074 external lighting connection diagram will help in troubleshooting headlights and tail lights

Auxiliary equipment

Auxiliary or additional electrical equipment of the VAZ 21074 includes:

electric motors: windshield washer;
windshield wiper;
heater fan;
radiator cooling fan;

cigarette lighter;

watch.

The connection diagram for windshield wipers uses:

Gearmotors.
ED headlight washer.
Mounting block.
Egnition lock.
Washer switch.

Windshield wiper motors drive a trapezoid that moves the wipers across the windshield

How and why should you disassemble the engine?

Engine disassembly is carried out if the engine is planned to undergo a major overhaul. At the same time, it must be completely disassembled and all worn elements replaced. In addition, boring the cylinder block, which must be freed from all parts of the engine, will be relevant. In addition, you can disassemble the engine in order to simply clean it, in case of serious contamination, when it is not possible to get by with simple flushing oil.

We will try to omit the details regarding its removal, since this is quite simple to do: you just need to unscrew the nuts 19 from the cushions, remove the attached parts (all parts of electrical equipment, hoses and pipes, as well as drives of various elements) and unscrew it from the gearbox. After this, the motor is thoroughly washed and installed on a special stand (the use of a regular workbench is also welcome).

Car wiring diagram

1 – radiator fan drive motor; 2 – relay and fuse block (mounting block); idle speed sensor; 4 – engine control unit; 5 – potentiometer; 6 – set of spark plugs; 7 – ignition control unit; 8 – electronic crankshaft sensor; 9 – electric fuel pump; 10 – tachometer 2107; 11 – lamp for monitoring the health of electronic systems; 12 – ignition system control relay; 13 – speed sensor; 14 – diagnostic connector; 15 – set of injectors; 16 – adsorber solenoid valve; 17, 18, 19 – fuse block protecting the injection system circuits; 21 – electronic fuel pump control relay; 22 – electronic relay for controlling the intake pipe heating system; 23 – intake pipe heating system; 24 – fuse protecting the heater circuit; 25 – electronic oxygen level sensor; 26 – cooling system temperature control sensor; 27 – electronic air damper sensor; 28 – air temperature sensor; 29 – pressure control sensor.

Generator set belt for VAZ 2107

The VAZ 2107 car was produced from 1982 to 2012. Initially, the model was equipped with a smooth drive belt (old model). Over time, the “seven” was modified several times and at the end of the 1990s, the generator began to work with a new type of belt with teeth.

The operation of the generator and the entire vehicle depends on the quality of the drive belt.

The design numbers and sizes of the belts are indicated in the vehicle’s service book:

2101–1308020 (smooth surface), dimensions - 10.0x8.0x944.0 mm;
2107–1308020 (toothed surface), dimensions - 10.7x8.0x944.0 mm.

How to tension a belt on a generator

The operation of the generator, as well as the water pump, primarily depends on the correct tension of the belt on the pulley. Therefore, existing rules cannot be neglected. The belt is installed and tensioned in the following order.

Place the assembled generator in place, lightly tightening the fixing nuts.
Take a pry bar and use it to fix the gap between the generator housing and the pump.
Place the belt on the pulley.
Without releasing pressure from the pry bar, pull the belt onto the pulley.
Tighten the top nut securing the generator until it stops.
Check the degree of belt tension - the rubber should not sag, but it should not be too tight.
Tighten the lower nut securing the generator.

Video: how to tighten the alternator belt

Checking the degree of tension is done with two fingers. You need to press the free part of the belt and measure its deflection. The optimal deflection is 1–1.5 centimeters.

Thus, we can say that independent maintenance of the generator on a VAZ 2107 is quite possible and does not fall into the category of impossible tasks

It is important to follow the recommendations and algorithms for this or that work in order to carry out quality repairs or diagnostics. However, if you have doubts about your skills and abilities, you can always turn to professionals for help.

Cleaning the carburetor without disassembling

In some cases, it is possible to clean the unit without dismantling it. Typically, this need arises when traveling, when it is not possible to get to a service station or remove the VAZ carburetor at home.

To carry out the work, you need to stock up on carburetor cleaning spray.

Important! It is not recommended to use gasoline, diesel fuel or kerosene for these purposes.

How to clean:

The air filter housing is removed.
The cleaner treats the XX channels, float chamber, throttle and air dampers, diffusers, jet channels, and drive elements.
Impurities begin to dissolve.
After a few minutes, you can spray the cleaner again.
The engine starts and warms up within five to seven minutes.
The choke handle is pulled out, the speed increases (you need to press the gas pedal).
When the power unit is running, the spray is applied to the cavities, flaps and other parts of the carburetor.
After stopping the engine, spray the aerosol again.
There is no need to wipe off the cleaner.
The air filter returns to its place.

It should be noted that subsequently you will still have to disassemble the carburetor on the VAZ 2107, since the dirt accumulated in the float chamber remains there. It will soon clog the jets again.

Protection of electrical circuits of VAZ 2107

The purpose of the fuse box is to protect the wires from fire and the battery from discharge in the event of a short circuit. The VAZ 2107 is equipped with a disposable fuse block, which is located under the hood near the battery - on the right on the partition between the engine compartment and the passenger compartment. This location was not chosen by chance - the fuses are located as close as possible to the battery in order to reduce the number and length of unprotected electrical networks.

The fuse location diagram is printed on the cover of the unit, which allows you to quickly navigate in the event of a blown fuse.

When replacing a failed fuse, its rating must be observed. This indicator is not marked on the cover of the fuse block, so you can find it out either from the VAZ 2107 diagram (injector) or based on the markings on the fuse to be replaced.

Important: failure to comply with the rating may lead to electrical wiring and fire. This can happen if the new fuse is rated for significantly higher current. The fuse block also contains electrical relays

The difference between the fuse block of the injection variation of the “seven” and the carburetor one is only in the presence of additional fuses for the ECM, fuel pump and other devices typical only for an injection car

The fuse box also contains electrical relays. The difference between the fuse block of the injection variation of the “seven” and the carburetor one is only in the presence of additional fuses for the ECM, fuel pump and other devices that are typical only for an injection car.

Carburetor design

The unit installed on the “seven”, despite the abundance of parts, is not complicated. Knowing the structure of the carburetor, you can independently replace failed elements.

Main components of the unit:

a float-type chamber into which fuel is dosed;
valve to stop the flow of fuel;
a compartment in which the mixture is mixed;
dampers, channels, jets;
spray;
diffuser;
pump to speed up the flow.