Timing marks
If the camshafts are incorrectly aligned relative to the crankshaft
– the reason for the engine tripping. The opening and closing timing of the intake and exhaust valves will not coincide with the engine strokes.
For example, at TDC of the piston the valve may be closed, so a flash will occur not only in the cylinder, but in the intake or exhaust manifold, depending on which valve is not closed.
This may occur due to a stretched timing drive.
. As the chain or belt is used, it stretches. Therefore, the opening or closing angles may shift. This leads to engine tripping.
What to do
If you have checked everything: the spark plugs are in order, there is a spark everywhere, the quality of the mixture is at the right level, you need to check the timing marks. We look at the degree of belt tension. In the case of a chain, how “out” the tensioner is. If the marks are knocked down, then we set them as needed.
After troubleshooting, we fix the problem. If the motor stops running, the cause has been found and eliminated.
Detection of a defect and its impact on the performance of the car
Even an inexperienced owner of domestic automotive products can determine that the engine is malfunctioning by the characteristic sound of the engine. The specificity lies in the feeling of it. That the power unit works like an old washing machine, with interruptions and vibration. In turn, with this malfunction, the sounds from the muffler will resemble popping instead of the standard hissing.
The appearance of a malfunction such as engine tripping will affect the operation of the machine as follows:
- Loss of power, which is logical;
- Excessive fuel consumption and the appearance of a strong smell of gasoline in the exhaust pipe. This is due to the fact that the specific trembling and vibration of the motor requires additional compensation for the effort required to operate the unit;
- If there is an inoperative cylinder, its contents from the fuel mixture are not consumed, but enter the engine crankcase;
- The result is a decrease in oil viscosity, a violation of its lubricating characteristics, which in turn leads to a decrease in compression, wear of the piston rings, and damage to the cylinder itself;
- Untimely diagnosis and elimination of this problem creates all the prerequisites for an extraordinary overhaul of the engine.
Distributor and capacitor
If the problem is in the capacitor on the distributor (and it can either fail completely or partially), then the engine will start and can operate properly and stably at idle speed. But while moving, the unit will twitch. This indicates a damaged capacitor. Remove the cover from the distributor, move the slider so that the contact opens. How is it checked? Turn the slider by hand to open the contact.
During the opening process, a spark should jump. If the capacitor is damaged, it will be blue and quite strong.
Also, the distributor may have insufficient or excessively large gap in the contacts. This causes unstable operation of the motor. The rod may wobble from side to side. It has cams and a slider installed. The contacts will open without much clarity, which will cause interruptions. The rod bushings or the entire distributor should be replaced.
Misfires - what is it?
Let's start with what is a cylinder misfire? This phrase means a situation where in one of the cylinders the ignition of the fuel mixture occurs late or slow. Simply put, the “acceleration” of the piston in some of the cylinders is slower than in the others. As a result, there is a violation of the synchronization of the engine, the engine runs unevenly, jerking occurs, fuel consumption increases, and the dynamics of the car decreases so much that even a small hill becomes a big test. In addition, in cars equipped with an ECU, a corresponding error appears on the display in the form of a code, for example “P0304” - misfire in the fourth cylinder. The last digit in the code corresponds to a specific cylinder.
Troubles the engine of a VAZ car. What to do?
The impetus for writing this post was a real repair at the request of a client, which consisted of a simple replacement of the vacuum booster, but isn’t it true that the engine may be tripping for the wrong reasons... In this post I want to consider the main reasons for this most unpleasant phenomenon, as well as methods for diagnosing and troubleshooting repair.
Let's start with the signs that the engine is running rough. “Engine trouble” - by this we mean that one or more cylinders are not working. Accordingly, the engine does not develop full power, does not have the necessary traction force, fuel consumption increases... But we all already know this, closer to the point.
VAZ 2107 engine troubles: causes and solutions
The sound of a VAZ 2107 engine revving is difficult to confuse with something. The car begins to make a characteristic intermittent knock, which indicates that only three of the four cylinders are working. The reasons for this, as well as the consequences, can be very different.
Main symptoms of a malfunction
The number of working cylinders decreases, and a decrease in power is immediately felt; the car no longer pulls as well as before. Vibration appears even at idle, and a characteristic trembling can be heard from the engine compartment. You may notice that fuel consumption has increased, and the smell of gasoline can be clearly felt in the exhaust gases.
If measures are not taken in time, a major engine overhaul may be required. And it’s not like changing a carburetor; it requires a lot of money and time. A mixture of gasoline and air is burned in the cylinders. If this does not happen in one of the cylinders, then the fuel accumulates and gradually mixes with the oil, going into the crankcase. Because of this, the viscosity deteriorates significantly, and lubrication ceases to have the desired effect. As a result, the piston and rings wear out to a critical state. In addition, the cylinder walls are erased. The VAZ 2107 engine needs repair.
Causes of cylinder failure
If the VAZ 2107 engine fails, there may be several reasons for this, and in order to find the fault, you need to perform several actions:
- find the faulty cylinder;
- check the spark plugs;
- inspect the wires, injector, injectors, valves;
- check air leaks into the carburetor;
- check operation hot and cold.
Identifying a failed cylinder is quite simple. When the machine is running, you need to remove the high-voltage wires one by one if a carburetor is installed. At this moment, no current will be supplied to the spark plug and the cylinder will stop working. The injector is simpler in that you don’t need to risk disconnecting the wires; it will be enough to remove the chips responsible for controlling the fuel supply. If nothing changes and the engine continues to operate without changes, the faulty cylinder has been found.
The next step is to check the spark plug. Having unscrewed it, you should carefully inspect it. If there is carbon deposits on it, then because of this the spark will not “break through”. It is a mistake to believe that replacement or simple cleaning will solve the problem. Without finding and eliminating the cause, a new candle will take on the same appearance in a short time.
You need to check for spark. To do this, you need to put a high voltage wire on it and bring the metal end to the engine housing. Next, someone needs to crank the starter several times. If everything is normal, a spark should appear. If it is missing, this may indicate:
- wire break or high resistance;
- failure of the ignition coil;
- malfunction of the electronic control unit;
- failure of the crankshaft position sensor;
- The belt is offset by several teeth.
If the spark is fine, but the car still does not pull, and you can clearly hear that the engine is shaking, the reasons may be the following:
- compression is broken;
- defects have arisen or the rings have worn out;
- problems with injectors;
- abnormal valve operation.
The cause of a non-working cylinder may be an injector or failed injectors. This may be a consequence of driving on low-quality gasoline or using homemade fuel system cleaning devices. Sometimes a breakdown is indicated by the fact that the injector has failed, but this is very rare.
Also, the VAZ 2107 engine malfunctions due to the fact that the injectors simply become clogged and it is enough to clean them. There may be a break in the power or control circuit to the injector, sometimes a short circuit occurs. It is advisable to carry out a diagnosis. Even if it does not reveal any error, this indicates that the reasons are mechanical.
There are frequent cases when the VAZ 2107 engine stalls when cold or hot. The first thing that comes to the specialist’s mind is that the valves need to be adjusted. It is recommended to perform this procedure every 20,000 km.
The term “cold” means that there are large gaps at the valves, and during prolonged operation, even at idle, the metal heats up and expands, and everything returns to normal. “Hot” means the reverse process. Before heating, all elements are within normal limits, but after heating, the valve jams.
If the engine of a VAZ 2107 fails, but the car does not pull, then you need to immediately find the cause and eliminate it. Otherwise, the consequences can be extremely sad and quite costly.
Five signs of tripling
It is very important that the fault is diagnosed in a timely manner. Then you need to isolate the problem as quickly as possible so that repairs can be made.
So, if the VAZ 2107 engine has trouble with the carburetor, the reason for this may be the malfunction of one of the cylinders. Sometimes several cylinders fail at once. In fact, this is due to the fact that for some reason the working mixture does not ignite in the combustion chamber of an idle cylinder, or it does not burn completely.
We list five signs of engine tripping in a VAZ:
- At idle, the engine begins to twitch and shake. Sometimes the shaking becomes so powerful that the vibrations are felt throughout the body, transmitted to the steering wheel and even to the gear lever. With such strong vibration, we are most likely talking about a complete failure of one of the cylinders.
- The engine power noticeably disappears, the driver feels the gas pedal sink, jerks appear during acceleration, and fuel consumption increases. The check engine light may come on. Of course, these problems also appear with other malfunctions. But this is exactly how tripling manifests itself.
- The engine speed begins to float or jump. RPM fluctuations can be either minor or quite large.
- If you look at the electrodes of the spark plugs, you will notice black carbon deposits. Of course, this may indicate a malfunction of the spark plug itself. But if, after changing the spark plug set, carbon deposits appear again in the near future, then there is another reason for the breakdown.
- The exhaust system begins to operate with sound “jerks” that transmit vibration to the body.
Even if you notice only one of these symptoms, you urgently need to understand what was the source of the breakdown. The point is that equipment failures cannot be ignored. After all, delay can lead to more serious problems that will require expensive repairs.
Where to look for the cause of cylinder failure
Important! You will have to look for the cause of engine cylinder failure in a garage. There are two possible ways here: check the mechanics or the electrical, that is, the ignition
Let's start with the simplest thing and diagnose the electrical system.
Spark plug. Let's use a proven method to check their functioning. Look at the side electrode and insulator, their color should be light brown, not black. There should also be no soot. If there is soot, it means the mixture is over-enriched or there is oil on it. Now let's start checking sparking. Place the spark plug on the high-voltage wire, and then bring it to the cylinder block, the distance between them should be 1-2 cm. Turn the starter. Did the spark travel that distance? This indicates that the spark plug is working properly, otherwise it should be replaced.
BB wires. They may be damaged
How to check this? Pay attention to the tip of the high-voltage wire. Did you see a light gray coating on it? This means he is operating at his limit.
Use a special multimeter to check the resistance of the high-voltage wire. Please note that depending on the motor, the wire length and resistance may vary. When there are no additional instructions, 20 kOhm is taken as a constant resistance value. If this value is exceeded, then the problem is in the high-voltage wire.
Distributor. When the spark plug does not work properly, a breakdown occurs in the ignition distributor cap. In this case, it is necessary to diagnose the ember; stretching the spring will also help.
High voltage wires are mixed up. If a cylinder failure occurs, the cause may be in the explosive wires.
Now let's check the mechanics.
Injector. A malfunction in its operation may be one of the reasons for the failure of the cylinder. For example, an injector is broken, the injector is clogged with a poor quality fuel mixture
Note! Damage can result from the use of the latest fuel purifiers, which can be purchased at any specialized auto store. It is best to diagnose and clean the injectors at a trusted service center.
Gas distribution mechanism
The fuel mixture enters the cylinders in the wrong quantity and quality. This can happen for various reasons. For example, the timing belt was installed incorrectly, the tensioners or oil seal became unusable. The camshaft may also break, or the hydraulic lifters may need to be replaced.
Because the engine constantly overheats, the cylinder head gasket may burn out. This happens because the car owner does not monitor the antifreeze level or drives the car at high speed.
All of the above can cause the cylinder to fail. By the way, not everything that can lead to such a breakdown is listed here. Only by understanding why one cylinder in the engine failed will you be able to eliminate the problem. You can do this yourself or by visiting a specialized service center.
Reason one - spark plugs
I wrote in detail about how to determine faults in car systems using spark plugs here .
I recommend reading it - it turned out to be useful, judging by your reviews, thank you.
We unscrew the spark plugs one at a time and look at their insulator. If it is covered with dense carbon deposits, then it is difficult for a spark to penetrate it. The current seeks the path with the least resistance, so the spark will not be between the electrodes, but will “go” along the insulator to the side. Its energy will not be enough to set fire to the air-fuel mixture. This cylinder will not work.
Heavy carbon deposits on the spark plug electrodes may cause the engine to trip.
We inspect the external condition of the spark plug insulator. If there are microcracks, then part of the current will not be converted into a discharge, but will escape through these damages. You need to look at the internal insulator, which is screwed into the cylinder head, and at the external one, onto which the armor wire cap is placed.
Any chips or damage can lead to poor sparking or its complete absence.
A superficial breakdown of the spark plug insulator is one of the reasons why the engine began to fail.
A large or small gap between the electrodes. Many people have heard or know that for certain engines, ignition systems and types of fuel used, spark plugs with a certain gap are required. Usually its value is indicated by the manufacturer of engines and cars.
In order for the spark plug to work well and the engine not to stall, a certain gap between its electrodes is needed
How to check the spark without special devices on the engine
This is an old, “grandfather” method, some people are afraid of it:
- They unscrewed the spark plug;
- They put an armored wire on her;
- They leaned it with the inner body, the metal part, against the engine;
- Turn on the ignition and turn the starter.
Be sure to hold on to the rubber cap of the armored wire, otherwise your hand will shake violently. This is what many are afraid of
