Troubles the VAZ 2107 injection engine: causes and treatment methods

“Trippling” of the VAZ-2109 engine is a term denoting a malfunction of the power plant that occurred as a result of failure and interruptions in the operation of one of the cylinders. This breakdown is quite common and occurs in engines with both carburetor and injection power systems.

Identification of an idle cylinder

The method for identifying a bad cylinder depends on the type of engine power system.

In carburetor engines, the determination of a failed cylinder is carried out experimentally. The essence of the method is to turn off each cylinder one by one by removing the tip of the high-voltage wire from the spark plug while the unit is running.

The check should begin with the 1st cylinder on a warm engine and with the speed set at 1500 rpm. If, after removing the tip, the speed drops significantly (the engine stops altogether, since as a result 2 cylinders will be switched off), the 1st cylinder is working normally.

Next, the test is carried out on the following cylinders. If the cylinder is not running, removing the tip will not affect the operation of the motor. After turning off the “drawdown” there will be no revolutions.

This test method is simple and allows you to accurately determine which cylinder is not working. But when doing it, follow safety precautions. High-voltage wires carry electrical impulses with high voltage but low current. These impulses will not cause damage to health, but the sensations are not pleasant.

As for the VAZ-2109 engine with an injector, the experimental method should not be used here (so as not to affect the operation of electronic systems). On such engines, the determination of an inoperative cylinder is carried out by scanning the ECU for errors. Interruptions in the operation of the motor are monitored by electronic systems and recorded in the form of error codes, by deciphering which we find out what caused the disruption of the normal functioning of the unit.

Video: VAZ-2109. The engine is shaking!

Symptoms of engine tripping

It is not difficult to understand that the engine is starting to stall - the manifestations are well known and clearly visible. The main one is a malfunction of the engine in idle mode. That is, vibrations, including strong and noticeable vibrations on the body, controls (steering wheel, gear selector) and twitching. Under load, the speed begins to fluctuate, sometimes in a fairly wide range.

While driving, the throbbing engine exhibits a loss of power. When you press the gas, the car refuses to accelerate smoothly and adequately; traction failures and jerking are felt. Other noticeable symptoms are increased fuel consumption and an illuminated Check Engine light on the instrument panel.

Checking the ignition system

The reason that the VAZ-2109 engine “troubles” is the ignition system. Due to its incorrect operation, the combustion process of the air-fuel mixture is not observed in one of the cylinders, which leads to unstable operation of the engine, severe vibration, and a drop in power.

Interruptions in the ignition system, due to which “triple” occurs, give:

1. Candles.
2. High-voltage wires and their tips.
3. Contacts of the distributor cover (distributor).
4. Hall Sensor.

These items should be checked in the same order.

Candles are one of the most common causes of tripping. Exhausted life, incorrect clearance, “breakdown” of the housing and penetration of the impulse to ground - these faults of the spark plug lead to failure or malfunction, which affects the operation of the motor.

You can verify that a spark plug is broken by replacing it with a known good one or swapping it with a spark plug from another cylinder. Replacing the spark plug can eliminate the malfunction of the power unit.

In addition to the spark plug, you should check the condition of the contact in the tip (which is put on the contact nut of the spark plug). It is made of copper and oxidizes over time, which leads to disruption of contact between the wire and the spark plug, and causes “triple” to appear.

In search of the cause, the high-voltage wires are checked next. Over time, the braiding of these wires loses elasticity and cracks, which is why voltage pulses “break through” to the ground, not reaching the spark plug.

A simple way to check the wires is to start the engine at night and open the hood. In the dark, “breakdowns” in the form of sparks are visible. If sparks are noticeable, replace the wires.

Next, look at the distributor cap and the slider. Gradually, the contacts on the slider and in the lid wear out, and they may also oxidize, which leads to loss of contact and interruptions in the operation of the spark plug.

Due to a malfunction of the Hall sensor, there is a failure in the formation of pulses supplied to the switch. Because of this, the operation of the ignition system is disrupted, in which the pulse from the coil to the distributor is missed, and from it to the spark plug.

Do not forget that an incorrectly set ignition timing is another reason for engine tripping. Therefore, in search of the cause, we be sure to check the setting of this angle and carry out adjustment work.

Signs

“Tripling” appears on the VAZ-2109 in the form of:

1. Unstable motor operation.
2. Strong vibration.
3. Power drops.
4. Difficulty starting.
5. The appearance of “pops” in the exhaust system.

“Tripping” is not a critical engine failure, and the car can be driven, at least to get to the repair site. But you shouldn’t delay repairs, since improper operation of one of the engine cylinders will ultimately lead to serious problems.

Malfunctions of the CPG and timing belt

Problems in the cylinder-piston group and gas distribution mechanism are another reason for interruptions in engine operation. This malfunction occurs when:

• occurrence of rings;
• piston burnout;
• burning of the valve plates and their seats.

Malfunctions of the CPG and timing, due to which the engine “trips” appear, are determined by measuring compression in the cylinders. A cylinder that operates intermittently has a lower compression rate than the rest.

Next, we establish the reason for the drop in compression. To do this, pour 20-30 g through the spark plug hole of the cylinder. engine oil, after which we take compression measurements again.

An increased compression ratio indicates the occurrence of rings. We eliminate this problem by decarbonizing the motor.

If the repeated measurement again shows low compression, you will have to remove the cylinder head to determine the cause of the malfunction.

The reason for the “triple” of the power unit can also be a breakdown of the cylinder head gasket. Due to this malfunction, a loss of compression occurs in the cylinder due to depressurization of the combustion chamber.

Finding the reason

Having found out which cylinder is causing the engine of a VAZ or a car of another brand to fail, we proceed to further research. You need to remove the spark plug and inspect it for the presence of gasoline. If the contacts are wet, it means either there is no spark, or the mixture is excessively rich or, on the contrary, lean.

If the candle is to blame

Install a known good spark plug and check the operation of the cylinder. If it starts working, you need to change the spark plug; if it doesn’t work, then the reason why the engine is throbbing is something else. We continue to search.

Problems with wiring or ignition distributor

The next thing to look at when there is no spark is the high voltage wiring. It is necessary to check the condition of the contacts and insulation. Are the terminals intact, free of corrosion, and is the insulation free of cracks? So the problem is elsewhere. Is there any damage? Replace the cable and check the performance of the spark plug again.

There is an express way to check high-voltage wires. It is necessary to start the engine, which has started to stall, in the dark - at night or in a windowless box with the lights off. Under such conditions, all breakdowns will be clearly visible in the form of sparks. With such a malfunction, the voltage simply does not reach the spark plug, so it does not spark.

If the wiring is OK, inspect the distributor cap. Due to a malfunction of this device, different cylinders work intermittently in turn. Cracks on the cover are a clear sign that one of the contacts in the ignition distributor has burnt out, so the engine began to stall.

Air intake from outside

If the spark plug is working properly and the discharge is supplied to it as normal, then the problem is in the air-fuel mixture. Sometimes the intake of air from outside dilutes the injection of gasoline to a concentration at which the mixture does not ignite.

The reasons for air getting into the cylinder can be very different: from damage to the intake manifold pipe to depressurization of the cylinder head seals. This is manifested by the fact that the engine stalls at speed and stalls when the load increases.

To fix the problem, you need to replace the damaged duct or seals. It is possible that air is leaking through the cylinder head gasket. You can replace the gasket yourself or contact a specialist.

Insufficient compression

Sometimes compression in the combustion chamber does not reach the desired value due to loss of tightness. If the mixture is not compressed to the desired level, the concentration of gasoline vapor is insufficient to ignite. Often the cause is stuck piston rings.

Due to accumulated deposits, the rings “stick” to the piston grooves and do not provide proper tightness. During the compression stroke, the air-fuel mixture seeps through the gaps of the piston-cylinder pair. Compression drops, fuel does not ignite.

In diesel engines, fuel spontaneously ignites due to high temperature when air is compressed. And if the compression is insufficient, then there will be no ignition. The quality of fuel atomization is also important here. If the high pressure fuel pump or injectors do not meet the specified parameters, then the fuel will not be evenly distributed in the combustion chamber in thin droplets, but will be “poured” or injected in large droplets. Such a spray of fuel, even with good compression, can lead to cylinder failure.

If the air duct is in good condition, but signs of malfunction have recently appeared, use Suprotec Active Plus tribological compound. It is added to motor oil. In terms of its mode of action, it is an engine additive; it does not change the composition of the lubricant and does not react with its components.

• Engine oil additive "Suprotek Active Plus"

  Restores compression, reduces fuel consumption and oil waste, reduces wear rate and extends the life of internal combustion engines of any type. Facilitates cold starts and protects against overheating in traffic jams.

  more reviews

The Suprotek Active Plus product improves the operation of valves and the oil pump by removing contaminants from friction pairs. The product also restores worn parts of the cylinder-piston group at a microscopic level. The tribo composition is capable of decoking stuck piston rings if the case is not completely advanced.

This set of factors helps restore compression in the combustion chamber to nominal values. The gaps in the friction pairs are normalized, and a thicker film of lubricant is retained on the parts. The cylinder operation returns to normal.

Of course, in advanced cases, when there is already wear on the inner surface of the cylinder, the additive will not help. This problem can only be solved by overhauling the engine with boring the cylinder and installing oversize pistons or lining.

To maintain in good condition and restore the characteristics of the fuel equipment of a diesel engine, it is recommended to use the Suprotek TNVD fuel additive.

• Fuel additive "Suprotek TNVD"

  Additive for high-pressure fuel pumps of diesel engines of any design (in-line, distribution, main in Common rail systems)

  more reviews

• Suprotek MAX injection pump additive for trucks

  For injection pumps of diesel internal combustion engines of trucks and special equipment: in-line, distribution, main fuel pumps, COMMON RAIL systems, PUMP-NOZZLE systems.

  more reviews

Problems in the power system

The power system is another component due to which the engine can “triple”. The reason for the malfunction of the power plant due to this system is a severe depletion and over-enrichment of the air-fuel mixture - either insufficient or excessive amounts of fuel enter the cylinder. But in carburetor and injection engines, a violation of mixture formation occurs due to various malfunctions.

In a carburetor system, the fuel supply is centralized (the air-fuel mixture leaving the carburetor is independently distributed among the cylinders in the manifold). Because of this feature, the likelihood of an insufficient amount of fuel entering the cylinder is eliminated, unless rings are stuck in one of them or the valves are burned.

The engine stalls at idle: common causes and quick diagnosis

It is quite obvious that with such a malfunction it becomes difficult to operate the vehicle, since you have to constantly increase the speed to maintain normal operation of the internal combustion engine. As a result, fuel consumption increases noticeably, cold starting of the engine can also be very difficult, etc.

At the very beginning, you need to determine which cylinder is not working. To do this, start the internal combustion engine, and then disconnect the high-voltage wires from the spark plugs one by one. If after disconnecting the power the engine operation changes, this means that the cylinder is working. Turning off the power from the non-working cylinder, on the contrary, will not lead to a change in the sound and nature of the operation of the power unit.

In some cases, replacing the spark plug or cleaning it allows you to normalize engine operation and get rid of “triple”. It should be remembered that although spark plugs can be designed for 30-80 or even 100 thousand km. mileage, when driving on domestic fuel, it is often necessary to change these elements already at 20-25 thousand.

It is also important to consider that when checking high-voltage equipment, you need to follow safety precautions. If you have no experience, then it is advisable to put a wooden block, rubber mat, etc. under your feet. Also, when disconnecting the wires from the spark plug, do not hold onto the cap. You need to grab a high-voltage wire. In this case, you should try not to touch the engine and car body.

At the same time, it should be understood that armored wires can also be damaged and penetrated. By the way, if the spark “goes somewhere”, in the dark it is enough to look under the hood to detect a breakdown.

Please note that when a diesel engine is running, to check it is necessary to alternately turn off the supply of diesel fuel to the injectors. To do this, unscrew the fittings on the high-pressure lines.

Now let’s imagine that the required cylinder has been found, the spark plug gives a spark, the armored wire is in perfect order, and the engine still runs rough. In this case, you need to unscrew the spark plug again and inspect the tip, determining whether it is wet or dry. As a rule, this will indicate problems with mixture formation.

If the spark plug is wet, then the air/fuel mixture may be too rich. A dry spark plug indicates that the mixture is too lean. In both the first and second cases, the cylinder will not work on such a mixture, even if the ignition system is working. The cause may be contamination or damage to the injectors, as well as the leakage of excess air.

As part of the diagnostics, you can perform a quick check of the injectors by disconnecting the power plugs from them. If when you turn off the power from any injector the engine operation does not change, then this is a faulty element. To confirm or refute this, swap this injector with the one in the adjacent cylinder. If the cylinder operates normally, then the problem is not the injector.

Finally, it should be remembered that an injection engine also fails in many cases due to damage or failure of coils, commutators, ECM sensors, incorrectly set timing marks, etc. In some cases there may be no spark, in others there is a spark and everything is fine with the fuel supply, but tripping is still present.

In such situations, it will be extremely difficult to solve the problem yourself, especially on the road. It is better to immediately go for computer diagnostics. For example, a failure or incorrect signal from the mass air flow sensor (mass air flow sensor) is often the reason why the engine runs unevenly and idles.

How to determine the cause of tripling

If you remove the tip from the spark plug, then when you reduce the idle speed, you will be able to verify the operation of the cylinder, but when checking in this way, there is a possibility of damaging the switch, and it may also pierce the cover of the slider or distributor. An electric shock from explosive wires is unlikely, if not even possible, but the tips should still be removed using pliers with insulated handles. If the carburetor engine shakes at idle, then very slowly pull the throttle cable with your hand, thereby increasing the speed to 3000 rpm. As soon as such a breakdown is detected, remove the air filter to gain free access to the carburetor. To avoid inconvenience caused by exhaust gases, we close the manifold outlet pipe, you can plug it with a plastic screwdriver handle. After carrying out this procedure and increasing the speed, different engine reactions may occur.

Brake booster failure

The vacuum brake booster (VUT) of the VAZ 2109 is not formally related to the operation of the cylinders. But failure of the VUT can lead to failure of the third cylinder. The engine will start to stall.

The vacuum booster is designed to reduce the force on the brake pedal required to effectively slow down the vehicle. To do this, VUT uses rarefied air, which it takes from the intake manifold. The intake hose fitting, equipped with a check valve, is located near the combustion chamber of the third cylinder. It is this cylinder that stops working if the amplifier fails or if the supply hose is damaged.

Due to the damage, atmospheric air is sucked in, the mixture becomes leaner, and ignition does not occur. Often, malfunctions in the operation of the brake pedal are accompanied by a significant increase in the force on the brake pedal; it becomes “dull” and does not provide proper deceleration. It happens that when you press the brake pedal, the engine stops revving and runs normally, but when you release the pedal, the third cylinder fails again. All of these are sure signs of a VUT malfunction, and they require your immediate response.

It is quite simple to make sure that the reason for the failure of the third cylinder lies in the amplifier.

If you have a spare amplifier, replacing the unit yourself is not difficult and can be done by yourself. If you go to the service, be careful: in fact, you are driving with faulty brakes.

Reasons why the engine stalls

First

. at speeds above 1200-1300 rpm, engine shaking may stop. In this case, shaking may occur due to the afterburning system or the power system. But the ignition remains in a normal (working) state and no malfunctions occur, this is explained by an increase in engine speed, the carburetor systems immediately come into operation, there are several of these systems, which means that they will not all break down at once. In the event that air begins to leak through the gap as the speed increases, the excess air will have a much smaller negative impact on the operation of all systems. This option cannot be ruled out; the engine may shudder from time to time. The reason is the lack of operation of one of the cylinders. The same can be said about a malfunction in the ignition. For the formation of a spark at idle speed, the established requirements are much higher than at speeds above 2000 rpm. Therefore, even the slightest defect in the ignition system will lead to engine shaking.

Second

. Shaking can also appear as a result of improper operation of the carburetor or injector. Shaking that occurs when the power system fails can appear due to an overly rich mixture or, conversely, a too lean mixture. Leaning of the mixture occurs more often than enriching it; this problem arises due to the appearance of excess air that enters the power system, after and into the combustion chamber. But unfortunately, this malfunction can appear on relatively new engines. And on older engines, another reason may be insufficient fuel level. In order to determine the level, rock the car a little. If the level in the window cannot be seen even when swinging, it means that it is completely filled with fuel. As a result, the carburetor is overfilled. If the carburetor is always overfilled, the exhaust gases will be black in color.

It is acceptable if the fuel level slightly exceeds the permissible limit. In this case, the reason lies in fatigue or even deformation of the tip on the needle itself, which controls the fuel supply at the right moments.

Air supply problems

If the air supply to the CA is disrupted, this means that the engine will also stall. Typically, excess air enters the system as a result of loss of air tightness. In this case, the engine will suck in an excess amount of atmospheric gas, which will not be controlled by the on-board computer, the fuel assembly will be depleted and the optimal combustion process will be disrupted.

Diagnostics of the air system is carried out as follows: we close the pipe near the air filter in any convenient way, after which we pump air into the main line at a pressure of about 0.5 atmospheres. The leak site usually gives itself away as a whistle - at this point air rushes out. If the pressure remains stable, the tightness of the air ducts is fine.

An unbalanced fuel assembly may also be due to insufficient air being thrown into the cylinders. This usually occurs due to a clogged air filter that is unable to provide the required throughput. To verify this, simply remove the filter and evaluate the engine's performance. If it has become more stable, this is the reason.

But it may turn out that not enough air is supplied due to a dirty throttle valve or other malfunction of the throttle mechanism. Typically, the condition of the damper is checked and, if necessary, cleaned at each scheduled maintenance (along with changing the oil, air and oil filter elements).

Finally, failures in the formation of fuel assemblies can occur due to loss of functionality of sensors (MRV, PDZ). As a result, the ECU receives distorted information from them about the actual position of the throttle valve or the amount of air supplied to the combustion chamber. This means that the on-board computer will generate commands for preparing the mixture incorrectly, which will certainly affect the performance of the power unit.

As a rule, if the mass air flow sensor malfunctions, the engine stalls when cold, and when it warms up, the problem disappears, although this is not a reliable sign of a sensor failure.

Sensors are checked for malfunctions using an auto scanner, which allows not only to identify the problem area, but also to clarify (localize) the problem by issuing the appropriate diagnostic code. All that remains is to correctly interpret the results and take appropriate measures (replacing the sensors or checking their power supply circuit using a tester).

What to do if the VAZ 2109 engine has trouble

The powertrain is the most important element of a vehicle. It is with its help that the car can move in a given direction. Naturally, any problems with the motor immediately affect the ability to use the machine. The main thing is to be able to recognize them correctly and seek qualified help in time to avoid worsening the situation.

Some problems will simply interfere with normal driving. And others will not allow you to budge at all. But regardless of the severity of the breakdown, it is necessary to immediately begin to fix it, since minor faults can lead to major problems if they are not repaired in time.

Main malfunctions of popular car models

Below is a list of the most common reasons why the XX engine may fail in popular car models. With its help, it will be easier to find and eliminate the cause.

When figuring out why the engine is shaking at idle, pay attention even to the little things, because minimal suction, slight deterioration in sensor contact or a change in its readings already disrupt the operation of the internal combustion engine. Most often, this manifests itself in the fact that when driving the engine runs normally, but at idle it noticeably throttles.

Reasons why the engine stalls

In professional jargon, the problem of failure of one of the cylinders is called engine tripping. This problem can be caused by several factors. Cylinder failure will be immediately noticeable to the driver, as it will lead to a large number of associated difficulties, among which it is worth highlighting:

• drop in engine power;
• the engine jerks at idle;
• the power unit starts very poorly when cold;
• fuel consumption increases;
• the combustible mixture does not burn completely in the chamber, and its residues are thrown directly into the catalyst.

Even an inexperienced car owner will find it very difficult not to notice such problems. They make life significantly more difficult and do not allow you to fully use your car. Therefore, if you identify problems associated with the VAZ 2109 engine, you must contact a service station for diagnostics.

If the engine on a carburetor or injection VAZ 2109 fails, this may be caused by the following reasons:

• spark plug fault;
• the wiring has burned out or due to winding wear, a short circuit occurs in the engine compartment;
• the air-combustible mixture is not compressed;
• the fuel-air mixture does not ignite due to lack of spark or poor fuel quality.

With carburetor engines everything is quite simple. The malfunction can be identified independently by alternately checking all components of the system. Using the elimination method, in a few hours you can completely test each node and find the problem area. To do this, it is enough to know the electrical circuit of your car.

With injectors, everything is much more complicated, since they are literally crammed with electronics. Therefore, in order to speed up the process and avoid accidentally breaking anything, it is better to turn to computer diagnostics. The program will independently identify all errors and display them on the laptop screen. Based on the data obtained, it will be possible to make a decision on further procedures that will be aimed at eliminating the problem.

Causes of cylinder failure

The appearance of missing is caused by the following factors:

• failure to adjust the ignition start;
• air intake in the brake system;
• accumulation of carbon deposits and breakdown of spark plugs;
• the integrity of the electrical wire leading to the spark plugs is broken;
• the appearance of malfunctions in the capacitor;
• violation of the integrity of the intake manifold;
• piston valve wear;
• the piston rings have become unusable;
• failure to adjust the gas distributor valves;
• violation of the integrity of the gaskets in the fuel pump head;
• wear of oil seals;
• adjustments in the carburetor are broken;
• air filter clogged;
• violation of the vacuum membrane of the advance regulator;

Inconsistency between the spark plug sizes and this type of engine can cause serious malfunctions in its operation.

When a cylinder stops functioning, the engine fails, the reasons that caused this defect entail a loss of power of the power unit, an increase in fuel consumption, and a malfunction of all vehicle systems.

What to do if the engine stalls in a VAZ 2109

Finding a problem is only half the battle. Next, it is necessary to develop a set of measures to eliminate it. The list of measures should include procedures that will help completely get rid of not only the problem, but also the reasons that caused it. Otherwise, there is a high risk of a recurrence of the old breakdown.

The following steps may help resolve the problem:

1. Replacement of spark plugs if they are worn out.
2. Insulation of wiring if the original winding has decayed or complete replacement of exposed wires.
3. Complete check of the fuel system and replacement of worn components.

But there are also situations when the spark plugs, wiring and other elements are in perfect order, but the engine speed on the VAZ 2109 still fluctuates. In this case, you need to look for the problem elsewhere. Most often it is associated with wear of the distributor. In this case, the issue will be resolved immediately after installing the new spare part.

Also, similar situations can arise if there are microcracks in the air tubes, which causes air leaks. It is very difficult to notice them with the naked eye, so you will have to remove all the parts and check them using a bath of water. You need to tightly close both ends and lower the hose into the water. If air bubbles rise to the surface, it means that cracks are still present.

Replacing a hose is not difficult or expensive. If the problem is the quality of the fuel, then there is only one piece of advice: never again fill the gas tank with low-quality fuel, since saving a few rubles can lead to the need for repairs costing several thousand. It is better to refuel at trusted stations that have all the necessary permits for their activities.

There are also cases when everything seems to have been checked, but no problems have been identified and the problem remains in place. Here you will have to start all over again and double-check again, only more carefully. It happens that the engine stalls due to an insignificant detail that many do not pay attention to. When a problem arises, the driver thinks that its cause must lie on the surface, so he looks for global changes, sometimes without noticing small details.

What are the dangers of operating a vehicle that is tripping?

As soon as the car is repaired, novice drivers have a question: is it possible to drive with this malfunction, and for how long? If you don’t care, you don’t want to extend the life of the engine, and you don’t feel discomfort from its improper operation - you can drive until the car stops starting. Of course, the engine tripping when cold, disappearing after reaching operating temperature, is not an emergency mode, but it also accelerates its wear. This is the first, still “light” signal that “something has gone wrong,” which is always easier to fix than to repair the result of a worsening defect.

The nature of the breakdowns due to cold trim depends on the reason for the incorrect operation of the motor.

Troubling due to air leaks or depletion of the mixture (injector) provokes overheating. Due to friction associated with a missed flash in the cylinder, unburnt fuel washes away the oil film from its walls, causing sticking, and partially enters the engine oil, worsening its properties.

The gasoline-oil mixture also “throws” the spark plug electrode, making it difficult to self-clean and further spark formation.

Unburned (or incompletely burned) fuel, entering the vehicle's exhaust manifold, contaminates the catalyst (or DPF filter, if we are talking about a diesel engine), accelerating the need to burn it. It’s difficult to do this in the “pulling” city mode, so the “cat” gets clogged, heats up, burns out and collapses faster. This malfunction will definitely cause errors in the lambdas, and perhaps something more serious (depending on the age of the car).

Repair VAZ 2108 2109 21099

Tuesday, March 17th, 2015

What to do if the VAZ 2109 engine starts to stall? This problem is very common, and there can also be many reasons for engine tripping. When they say that the engine is tripping, they mean that one cylinder of the engine is not working. Because of this, an imbalance results, which is easily determined by ear: the engine runs evenly, but with failure. This failure occurs on a non-working cylinder of the VAZ 2109 engine. Why might the cylinder not work? And in general, what does “cylinder not working” mean? We all know that an internal combustion engine contains working cylinders inside which the combustible mixture burns. During the combustion of the combustible mixture, positive work occurs when the gases expanded as a result of combustion lower the piston down, turning the crankshaft. If all four cylinders are working, then the engine speed is even, this can be seen on the tachometer and audible. And so, if for some reason the mixture does not ignite in one cylinder, or positive work is not done to lower the piston, then the engine stalls. Then the economizer needle will begin to twitch and the VAZ 2109 engine speed will be unstable. Reason for engine tripping No. 1 - a spark is not supplied to the cylinder: a) Faulty spark plug of the VAZ 2109. The spark plug may be pierced into the housing, or the spark plug may have an incorrectly set gap. To check the serviceability of the spark plug, it is unscrewed from the engine and leaned against the ground. Then, turning the starter, visually check for the presence of a spark on the spark plug. Naturally, the candle must be held with pliers, or even better, with pliers wearing rubber gloves. Anyone who has already received a 20 kV discharge will agree that safety is never superfluous.

We unscrew the spark plug of the VAZ 2109

Keep in mind that even if a spark jumps from an unscrewed spark plug, this is not a 100% guarantee of its performance. Since inside the cylinder there are completely different physical conditions. b) Breakdown of the high-voltage wire of the VAZ 2109. If the high-voltage wire is broken, the spark will be very weak or there will be none at all.

High-voltage wires VAZ 2109

I wrote a little higher about safety precisely because the reason for my VAZ 2109 tripping was a broken high-voltage wire. I decided to move them with the engine running and, due to inexperience, took them with my bare hands. When you receive an electric shock, the muscles in your palm do not work and you yourself are not able to let go of the wire from your hand. It's good that a friend was nearby. So be careful. c) Malfunction of the ignition distributor of the VAZ 2109. Due to internal malfunctions: contact burning, mechanical wear, etc., a situation may arise that a spark will not pass from the distributor to a certain cylinder.

Ignition distributor cover VAZ 2109

d) Hall sensor. If the Hall sensor is partially malfunctioning, it may transmit pulses from the drum on the shaft of the VAZ 2109 distributor and not generate pulses to the switch. That is, there will be a missed spark. The reason for engine tripping No. 2 is air leakage: a) Air leakage through the hose of the vacuum brake booster of the VAZ 2109. This hose is connected to the engine intake manifold and if air leakage occurs through it, the combustible mixture will be lean and the engine may stall.

Vacuum brake booster hose VAZ 2109

b) Air leak through the vacuum corrector hose of the VAZ 2109 ignition distributor.

Vacuum corrector VAZ 2109

c) Air leakage through the gasket between the intake manifold and the carburetor. d) Air leakage through the rubber band of the idle speed solenoid valve of the VAZ 2109. Reason for tripping No. 3 is the lack of compression in the cylinder. a) Piston burnout. If the piston burns out, then during the compression stroke no pressure will develop inside the cylinder, and the combustible mixture will fly into the crankcase. Through the crankcase exhaust gas ventilation system, the gases are supplied for afterburning to the VAZ 2109 air filter. b) Burnout of compression rings. In the same way, the pressure in the cylinder is released through the broken rings. c) Burnt out intake or exhaust valves. d) Incorrect valve adjustment. e) Hardening of valve stem seals. A hardened oil seal prevents the valves from tightly closing the cylinder inlet/outlet ports. e) The cylinder head gasket has burned out and all the pressure goes into the cooling system. As a rule, the tank with antifreeze explodes, and the antifreeze itself is in the oil. If you don’t know how to determine which cylinder in the engine is not working, then it’s okay, it’s simple. Wear rubber gloves. Using the choke, you set the idle speed of the VAZ 2109 engine to one and a half thousand revolutions per minute. And alternately remove the high-voltage wire from each cylinder. Did you remove the wire, did the engine performance change? Did he start shaking, choking, stalling? This means that everything is in order with this cylinder, it works. We put the high-voltage wire back on and disconnect the next cylinder. If the engine operation does not change in any way when the high-voltage wire is discarded, then this cylinder is inoperative. Okay, the faulty cylinder has been identified. Now you can check whether the cause of the tripping is the lack of a spark or not. We unscrew the spark plug, hold it in pliers, bring it to the ground and turn the starter. If there is a powerful, good spark on the spark plug, then the reason for the tripping of this VAZ 2109 engine is hidden among reasons 2 and 3. It should be noted that if the engine is tripping due to air leaks, then alternately folding back the high-voltage wires will not give any effect and it is impossible to determine the inoperative cylinder. The cause of tripping in this case will be an over-lean combustible mixture. To home

Engine tripping

There will be very little theory today. Engine trouble is when, for some reason, on a four-cylinder engine, one of the cylinders begins to misfire. Although once on the Internet I came across a funny theory that tripling is when one of the strokes is missing in a four-stroke engine. Well, it happens. I will not comment on this scientific discovery.

Anyone who started their journey as a motorist with a “nine” or something similar spiritual and strong will immediately roll up their sleeves and in most cases find the cause of the malfunction. Those who have recently driven a fuel-injected car and confuse the DPKV (which we wrote about not long ago) and the oxygen sensor have a more difficult time. It seems that there are too many smart things, blocks, sensors and other “computers”, and it’s difficult to understand such a motor. There is some truth in this. The death of the same DPKV can lead to an uncertain start of the engine and to its tripping. But let's face it: it's not very often that these sensors die on their own, and the reason for the tripping is much more often much simpler. And finding it on your own is not only easy, but also pleasant.

The tripling itself is impossible not to notice. The engine runs unevenly, instead of a uniform “trrrrr”, some kind of uneven “trrr-bu-trrr-boo” is heard from the exhaust pipe, and sometimes it can make a rather loud bang (if gasoline accumulates in the exhaust, evaporates and escapes from the heating iron). Sometimes (but not always) the Check Engine light will flash or stay on. And this is already a good reason to do diagnostics.

I want to warn you right away: computer diagnostics in themselves are a necessary and good thing, but you shouldn’t hope that someone will connect their Chinese ELM 327 scanner to your car for 500 rubles and immediately make a diagnosis. Most likely, the result of such a diagnosis will be the phrase “misfire in such and such a cylinder,” and that’s all. Why the pass, where does the pass come from, what to do with it - all this confuses such a would-be diagnostician. In response, you will see his look, the way a reclusive pensioner looks at Eldzhey, and you will hear an indistinct bleat. So if you don’t have the money or the desire to go straight to a good but expensive diagnostician, it makes sense to deal with the engine yourself. For example, I will disassemble the simplest naturally aspirated four-cylinder gasoline engine, of which the majority are found in modern budget cars.

I propose a non-standard approach to solving the problem. We will not go from causes to consequences, but vice versa - the way we encounter it in life. That is, we will first carefully examine under what conditions tripling occurs, and based on this information, we will think about why it might appear. Let's start with the simplest case - tripping after a morning start in wet weather.

What other reasons could there be for the malfunction of carburetors 2108, 21081, 21083, 2109

1. The channels and jets of the carburetor idle system are clogged
2. Low fuel level in the carburetor float chamber
3. The air filter element is clogged. The degree of contamination should be quite high. Replace it with a new one.
4. The power system before entering the carburetor is faulty
5. Fuel pump is faulty
6. The filters in the power supply system are clogged. This is a filter on the fuel intake in the gas tank, a fine fuel filter and a mesh filter in the carburetor.
7. Power system elements are damaged
8. Ignition system is faulty
9. Spark plugs are faulty
10. The distributor (cover, slider) is faulty
11. High voltage wires are faulty
12. The ignition timing is not set correctly
13. The power supply system is faulty
14. Short circuit in wiring
15. Thermal clearances in the valve mechanism are broken
16. Marks in the timing system are shifted
17. Wear of the piston group (breakage or stuck rings, wear of cylinders)
18. Valves burnout

Before you begin to identify the causes of engine tripping at idle, it is necessary to conduct a visual inspection of its engine compartment. A loose wire, a chip not fully inserted, a kinked hose, etc. will not allow the engine to work normally, and will take away the time and effort of the car owner spent on troubleshooting.

Reasons for unstable operation of the VAZ 2114 engine cylinder block

The most common diagnosis you can hear is that the cylinder has failed. In fact, this formulation is not entirely correct. The cylinder has stopped working, that's it. But there can be many reasons for this incident:

• the spark plug is faulty or partially damaged;
• low compression in cylinders;
• the valves have not been adjusted for a long time or they do not fit well;
• the injectors are overfilled or clogged and require replacement;
• the high-voltage spark plug wire is broken;
• the oxygen sensor has failed;
• malfunction in the ignition coil;
• the electronic control unit has failed;
• The crankshaft position sensor (CPS) has failed;
• The timing belt has fallen off completely or has moved several notches;
• The air filter is not working well or is very dirty.

The consequences of stopping the operation of the cylinder can be detected both instantly, that is, directly during inspection of the machine, and in a delayed mode; it is these consequences that are most dangerous for the machine.

It is immediately apparent:

• increased vibration, which manifests itself due to a rhythm disturbance in the operation of the valves and, accordingly, all rotating parts of the engine and transmission;
• significantly increased fuel consumption due to disturbances in the injection system and the appearance of a characteristic smell of exhaust gases due to an increase in the concentration of harmful impurities and unburned fuel in them;
• a noticeable drop in the power of the power plant and, accordingly, the maneuverability of the vehicle.

If, immediately after detecting signs of engine “triple”, measures are not taken to identify and eliminate the causes of this phenomenon, this can lead to failure of the entire unit and its overhaul or replacement. The fact is that gasoline is constantly injected into the idle cylinder, which, without burning, mixes with the incoming oil and goes into the crankcase. If this condition lasts for a long time, the oil dilutes, loses its lubricating properties, and engine parts begin to work in extreme mode, wearing off and forming chips. The consequences will be felt very quickly and the engine will have to be sent to capital.