Detection of PC faults. Troubleshooting in electronic circuits Eliminate Freon leakage

Drivers have long been accustomed to comfortable conditions in the cabin that provides air conditioning. Therefore, his breakdown significantly affects the well-being of the driver and passengers. Repair and maintenance of autoconditioners are usually carried out by specialists at the station station, but in order to save it, it's forces to make your own hands, having at hand required tool. The article describes how to detect the car conditioner faults and perform it with your own hands.

The air conditioner consists of several elements forming a closed system with front and rear contour, which moves freon - coolant. Circulation on the back and front contour of the refrigerant is carried out at the expense of the compressor. The compressor compresses Freon, providing pressure in the system. In the compressor, the refrigerant is heated and comes out of it in the form of gas. Freon comes into a condenser, where the system cools the gas, and it turns into condensate.

The refrigerant is then cleaned from impurities in the receiver-desiccant and moves to the thermostatic valve (TRV). Next, the liquid refrigerant enters the radiator, where it turns into a gaseous state. At the same time, it shrinks the air by absorbing heat from it. The radiator coolly cools the air when it passes through it. Chilled air enters the salon. Freon returns to the rear contour compressor, and the cycle is repeated first.

Any of the elements of the air conditioning system may be unusable, which will affect the operation of the entire system. Therefore, it is necessary to deal with what faults may arise how to conduct their diagnostics, why there is one or another malfunction, and how to fix it.

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How to identify a malfunction?

To identify faults, do not need a tool, you should diagnose the system when it works: visually inspect the rear and front contours, listen to the noise and smells, check whether water drips. If there are extraneous sounds and unpleasant odors, water drips - all this talks about some kind of malfunctions.

If troubles are detected after diagnostics, they should be immediately eliminated to avoid more expensive repairs.

Below are the types of faults and the causes of their occurrence:

We produce compressor repair

If the compressor does not turn on, it displays the air conditioning system from the working state. The first cause of the malfunction may be the leakage of freon, therefore, first of all, it is necessary to diagnose the system for detecting refrigerant leaks.

To do this, see the following structural elements:

• cracks on the air conditioner body arising due to equipment defects;
• migratory malfunction, it can carry, especially it concerns the air conditioning of passengers rear seatbecause the pipeline passes under the bottom of the car;
• wear rubber gaskets in places connection of the elements of the system, pump.

Special attention should be paid to the gasket of the compressor. The refusal of the compressor can cause faulty electronics and a clogged capacitor. Usually the compressor is not repaired, but change to new element.

The exact reason for the failure of the equipment can give complete diagnosis with professional equipment.

Eliminate the leakage of Freon

If the car air conditioner is turned on, but the air in the cabin is not cold, then you need to find the reason why. The reason for this is most likely the leakage of freon in the front or rear circuit, in places of compounds. This is the most common faunity of the air conditioner. This breakdown can be avoided if you perform diagnostics on time and service maintenance cars.

Before you eliminate refrigerant leakage, you need to detect the place of leaks. Diagnostics are performed without tools using special gas analyzers that detect the presence of freon and can accurately indicate leakage.

The second way: refueling the system of refrigerant with ultraviolet dye. Checking the front and rear circuit, and the entire system is performed using an ultraviolet lamp. When leakage is detected, it is necessary to either replace the part or if the part is metallic, put a patch, prepare the necessary tool and materials. Worn rubber parts should be replaced with new consumables.

We repair pipes and hoses

In any air conditioning system, the car includes pipes, rubber gaskets, glands, hoses of highways. All of them are connected into a single system, with front and rear contour, providing her tightness. If one of the elements comes in disrepair, then depressurization occurs, water drips and the air conditioner works badly. After visual inspection And the detection of refrigerant leakage places need to be replaced by the spoiled parts, both the front and rear circuit and return the system by Freon.

Small cracks on aluminum tubes can be eliminated with their own hands without a tool with special compositions. With their help, soldering cracks in the form of patches. The mixtures are applied on holes in several layers, the thickness of which is 2-3 mm. If the cracks are large - width of 2-3 mm, then the repair of auto air conditioners is carried out using argon-arc welding. It is necessary to purchase a special tool: bending machine for pipes, pipe cutting and welding. Instead of pipe cut, you can use the mill.

In order for the parts of the front and rear contour to remain elastic, it is necessary to continuously use the air conditioning, even in winter, and watch it clean.

With Radiator

The air conditioner radiator is in such a place that various objects are constantly affected by it: dirt, pebbles, water, salt and more. Over time, it is wearing, corrosive processes occur, equipment depressurization occurs. This manifests itself in the fact that the system does not show air, starts to drip water.

The best way out in this situation is to buy a new unit, since if you repair the condenser with your own hands, there is a high probability that there will be depressurization elsewhere. Will drip water again and need new renovation. In addition, if troubleshooting is used special equipment, welding and tool, overlap working highways, which affects the power and productivity of the air conditioner.

Summarizing

If the car was operated for some time with a filtered compressor or a faulty concessionaire, as well as after the repair, with his own hands, before filling the air conditioning system, it needs to make preventing flushing. During flushing from the system, dirt, moisture, various pollution, waste oil, which interfere with the quality of the air conditioner will be removed.

Washing equipment is necessary and when the compressor is looped, since in this case metal chips can enter, other contaminants. Washing with your own hands requires a lot of time and strength, as you have to rinse each item separately. To wash with your own hands you will need a tool for disassembling and assembling equipment and special meansWith which all pollution is easily removed.

Repair of autoconditioners is better to perform at maintenance stations, since the air conditioning system involves high pressure. After repair work Washing and refueling system by freon and oil, while you need to know exactly the amount of fluid flexible. The service station has all the necessary equipment, tool for repair, flushing and refueling the air conditioner.

Each car owner must follow the condition of his car and to make regular diagnostics and maintenance of all equipment of the car regularly.

Video "Maintenance of an Autoconditioner"

In this video from "Avtodiagnostik 24", it is described how to diagnose, perform repairs and refueling car conditioner.

IN modern cars Ball supports are an indispensable component that binds the pendant lever with a hub on a controlled wheel. The main task that is placed in front of the ball support in the car suspension is the rotation of the hub when vertical move, while maintaining the original position of the wheel horizontally. The failure of the ball support is a serious problem, especially if it occurs when the car is moving. The breaking of the support is fraught with the turns of the wheel outward, which will inevitably lead to the car's rolling on the wing, and it is better if the malfunction occurs at the beginning of the movement, and not at high speed.

Signs of Fault Ball Support

Since when faulty ball supports, the probability of an accident seriously increases, the driver must control their condition. Ball supports from various manufacturers on various car models are capable of listening from 15 to 150 thousand runs, so it is quite difficult to definitely say when they are required to be changed. Most often, car manufacturers indicate in the manual technical exploitation Machines Recommended deadlines for the replacement of this suspension element.

Pretty rare ball supports break in an instant, so the driver has the opportunity to recognize the symptoms of their emergence in advance and replace the details to new ones. The main signs of the malfunction of the ball supports are as follows:

If any of the above symptoms arose, it is necessary as soon as possible to diagnose the suspension and steering of the vehicle.

How to check the ball support

If there are suspicions for the presence of a car suspension problem, its test will be the best solution using special diagnostic tools for service centers. But there are a number of proven ways, how to determine what caused problems with ballproof:

Also, some ball supports have special diagnostic holes that allow you to measure your finger wear. Through them, it is possible to measure the distance from the bottom of the finger to the surface of the ball support.

Causes of failure

The ballproof fails in mechanical damage. There are a number of factors that can speed up this process:

The ball support is one of the key suspension elements, and it requires the attention of the driver. If it does not notice its strong wear on time, it can lead to a dangerous accident.

The most common case of the occurrence of knocks is an increase in the technical gaps in the pairing parts. Most often, with an increase in the rotor of the engine, the knock becomes more intense, but it happens on the contrary - it may depend on the engine temperature and the lubricant intensity.

If the knock as the car is used, it remains unchanged (in fact - almost unchanged) - this is due to the wear of parts of solid materials (for example - a gas distribution mechanism) if the sound progresses - a pair of "soft material + solid" was worn out (for example - crank-rod mechanism).

Uniform crankshaft Usually, it is precisely as a result of an increase in technical gaps in detail pairing: pistons, distribution Vala, crankshaft, cylinder block.

If the knock under load is enhanced and its intensity progresses while driving, the likelihood is large, the crankshaft bearings are damaged, the crank-connecting mechanism.

A knock with a frequency less than the crankshaft usually talks about problems with the distribution mechanism.

Loud deaf blows - a malfunction of a crank-connecting mechanism (wear connecting rod liner or root bearing). Such a sound can be the result of cracks on the drive disk in the automatic gearbox.

A knock with a frequency, higher than the rotational speed of the crankshaft, is often a consequence of foreign objects in the oil pan or outlet path.

Rhythmic tapping, increasing with increasing revolutions, is impaired adjustment of the valve mechanism or too low oil in the engine.

Uneven knobs arise when wearing stubborn bearings of shafts, weakening landing or defects in pulleys and flywheels.

Casting sounds - a sign of the wear of the belt of the gas distribution mechanism or the belts of the aggregates drive.

The whistle under the hood is usually a consequence of the weakening of the tension or slippage of the belt of the generator or the pump drive.

The clan of the metal heated from the bottom of the cylinder block is a piston malfunction. A loud flax sound from the top - a sign of wear camshaft fists.

The humorous sound that develops into a buzz is a sign of a malfunction of the generator.

A characteristic hissing is a frequent sign of depressurizing any system due to the weakening of the clamps or a breakthrough of one of the hoses.

The uneven sound of the motor in the rhythm "3 through 1" (they say "Troit Engine") means that one of the cylinders does not work (skips the move), for example, one of the candle does not ignite the mixture. Other signs of malfunction are instability of work on idling, Power drop, increase fuel consumption.

So, a uniform knock with a crankshaft frequency (and, especially - increasing) - In most cases, a sign of breakage, a further movement with which will lead to necessity overhaul Engine or replace it. Those. If there are sounds of such a kind - you should immediately stop and get to a hundred already on the tow truck.

With damped or uneven knocks in most cases, it is possible to get to a hundredfold.

In any case, in the occurrence of extraneous knocks - as soon as possible should be visited by a hundred.

There are two methods of testing to diagnose malfunction electronic system, devices or printed circuit boards: functional control and intra-hem control. Functional control ensures verification of the operation of the tested module, and the intrahemny control is to check the individual elements of this module in order to determine their nominal polarity, and so on. Usually both of these methods are used in series. With the development of automatic control equipment, it has the possibility of very fast intrahemal control with an individual test of each printed circuit board element, including transistors, logical elements and counters. Functional control also moved to a new quality level due to the use of computer processing methods and computer control. As for the principles of troubleshooting themselves, they are exactly the same, regardless of whether the check is carried out manually or automatically.

Finding a fault Must be carried out in a specific logical sequence, the purpose of which is to find out the cause of the fault and then eliminate it. The number of operations carried out should be minimized, avoiding optional or meaningless checks. Before checking a faulty scheme, you need to thoroughly examine it for possible detection of explicit defects: distilled elements, ruptures of conductors on pCB etc. It should be paid to no more than two or three minutes, with the acquisition of experience such visual control will be performed intuitively. If the inspection did not give anything, you can proceed to the troubleshooting procedure.

First of all executed functional test: The board work is checked and an attempt is made to determine the defective block and a suspected faulty item. Before replacing a faulty item, you need to spend intrahemal dimension The parameters of this element in order to make sure of its fault.

Functional tests

Functional tests can be divided into two classes, or series. Tests series 1., referred to dynamic tests Apply to finished electronic device To highlight a faulty cascade or block. When a specific block is found with which the fault is associated, tests are used. 2 series or static tests To determine one or two, possibly faulty elements (resistors, condensers, etc.).

Dynamic tests

This is the first set of tests performed when troubleshooting in the electronic device. Troubleshooting should be carried out in the direction of the device to its input by method of division in half. The essence of this method is as follows. First, the entire device diagram is divided into two sections: input and output. A signal is applied to the output section input, a similar signal, which in normal conditions acts at the partition point. If the normal signal is obtained at the output, it means that the malfunction must be in the input section. This input section is divided into two subsections, and the previous procedure is repeated. And so until the malfunction is localized in the smallest functionally distinguisse with the cascade, for example, in the output cascade, a video amplifier, or an inheritance amplifier, frequency divider, decoder, or a separate logical element.

Example 1. Radio (Fig. 38.1)

The most suitable first division of the radio scheme is dividing on ZCh-sepper and an IF / RF section. First, the ZCh section is checked: a signal with a frequency of 1 kHz through a separator capacitor (10-50 microf) is supplied to its input (volume control). Weak or distorted signal, as well as its complete absence indicate a malfunction of the ZC-section. We now divide this section into two subsections: the output stage and the preamp. Each subsection is checked, starting from the exit. If the ZCh-section is proper, then a pure tone (1 kHz) should be heard from the loudspeaker. In this case, the malfunction should be sought inside the PC / RF section.

Fig. 38.1.

Very quickly to make sure in the serviceability or malfunction of the ZC-section can be using the so-called "Screwdriver" test. Touch the end of the screwdriver to the input clips of the ZCh section (after setting the volume control to the maximum volume). If this section is properly, a loudspeaker buzz will be clearly audible.

If it is established that the malfunction is inside the PC / RF section, it should be divided into two subecutions: the PC section and the RF section. First, the PC section is checked: an amplitude-modulated (AM) signal with a frequency of 470 kHz 1 is supplied to its input of the transistor of the first UPUs, a signal with a frequency of 470 kHz 1 through a 0.01-0.1 μF. For the FM receivers, a frequency-modulated (CM) test signal with a frequency of 10.7 MHz is required. If the PC section is properly, a pure tone (400-600 Hz) will be brought in the loudspeaker. Otherwise, you should continue the procedure for splitting the PC section until a defective cascade is found, for example, an UPU or detector.

If the malfunction is inside the RF section, then this section is divided into two subsection and is checked as follows. AM signal with a frequency of 1000 kHz is fed to the cascade input through a separator capacitor with a capacity of 0.01-0.1 μF. The receiver is configured to receive a radio signal with a frequency of 1000 kHz, or a wavelength of 300 m in the middle-raccion. In the case of a FM receiver, naturally, a test signal of another frequency is required.

You can use the alternative test method - the method of sketchous checking signal passing. The radio is turned on and configured to any station. Then, starting from the output of the device, with the help of an oscilloscope, the presence or absence of a signal in control points is checked, as well as the correspondence of its shape and amplitude required criteria for a serviceable system. When searching for a malfunction in any other electronic device, a nominal signal is fed to the input of this device.

The principles of dynamic tests can be applied to any electronic device, provided that the system and selecting test signals are properly separated.

Example 2. Digital Frequency Divider and Display (Fig. 38.2)

As can be seen from the figure, the first test is performed at the point where the scheme is divided into approximately two equal parts. To change the logical state of the signal at the input of block 4, the pulse generator is used. The light-emitting diode (LED) at the output must change its state if the lock, amplifier and LEDs are working. Next, the troubleshooting should be continued in the divisors preceding the block 4. The same procedure is repeated using the pulse generator until a faulty divider is defined. If the LED does not change its state in the first test, the fault is in blocks 4, 5 or 6. Then the pulse generator signal should be supplied to the amplifier input and so on.

Fig. 38.2.

Principles of static tests

This test series is used to determine the defective element in the cascade, the fault of which is installed at the previous stage of checks.

1. Start by checking static modes. Use a voltmeter with a sensitivity not lower than 20 com / c.

2. Measure only voltage. If you want to determine the current value, calculate it, measuring, the voltage drop on the resistor of the known nominal value.

3. If the measurements on the constant current did not reveal the cause of the fault, then only then go to the dynamic testing of a faulty cascade.

Conducting a single-stage amplifier testing (Fig. 38.3)

Typically rated values constant stresses In the control points of the cascade are known. If not, they can always be assessed with acceptable accuracy. By comparing the real measured voltages with their nominal values, you can find a defective element. First of all, the static transistor mode is determined. Here are three options.

1. The transistor is in the cut-off state, without producing any output signal, or in a condition close to the cut-off ("goes" to the cutoff area in dynamic mode).

2. The transistor is in saturation state, producing a weak distorted output signal, or in a state close to saturation ("goes" to the saturation area in dynamic mode).

$ 11.Transistor in normal static mode.

Fig. 38.3. Rated voltages:

V. E \u003d 1.1 V, V. B. = 1.72 V, V. C \u003d 6,37V.

Fig. 38.4. Open resistor R. 3, transistor

the cutoff is in the condition: V. E. = 0.3 V,

V. B. = 0.94 V, V. C. = 0.3V.

After the actual mode of operation of the transistor is installed, it turns out the cause of the cut-off or saturation. If the transistor works in normal static mode, the fault is associated with the passage of the variable signal (such a malfunction will be discussed later).

The cutoff mode of the transistor, i.e. the cessation of current flow, takes place when a) the transistor base-emitter transition has a zero bias voltage or b) breaks the flow path, namely: when the resistor is broken (abrupt) R. 3 or resistor R. 4 Or when the transistor itself is defective. Usually, when the transistor is in a cutoff state, the voltage on the collector is equal to the power supply voltage V. CC. . However, when cutting a resistor R. 3 collector "floats" and theoretically must have the potential of the base. If you connect a voltmeter to measure the voltage on the collector, the base collector goes into the conditions of direct displacement, as can be seen from fig. 38.4. On the chain "Resistor R. 1 - The transition base-collector - voltmeter will flow, and the voltage will show a small amount of voltage. This testimony is fully connected with the internal resistance of the voltmeter.

Similarly, when the cut-off is caused by a breakdown of the resistor R. 4, "floats" the emitter of the transistor, which theoretically must have the potential of the base. If you connect a voltmeter to measure the emitter voltage, a circuit of current flow circuit is formed with a direct displacement of the transition of the base-emitter. As a result, the voltmeter will show the voltage, slightly greater rated voltage on the emitter (Fig. 38.5).

In tab. 38.1 The faults discussed above are summarized.

Fig. 38.5. Open resistorR. 4, transistor

the cutoff is in the condition:

V. E. \u003d 1.25 V, V. B \u003d 1.74 V, V. C. = 10 V.

Fig. 38.6. Short circuit of transition

base-Emitter, the transistor is in

cut-off state:V. E \u003d 0.48 V, V. B \u003d 0.48 V, V. C. = 10 V.

Note that the term "high V. Be "means excess normal voltage Direct displacement of the emitter transition to 0.1 - 0.2 V.

Fault transistor Also creates cut-off conditions. Voltages in the control points depend in this case on the nature of the fault and the nominal elements of the scheme. For example, a short circuit of the emitter transition (Fig. 38.6) leads to a cut-off of a transistor current and a parallel compound of resistors R. 2 I. R. 4 . As a result, the potential of the base and emitter decreases to the value determined by the voltage divider R. 1 – R. 2 || R. 4 .

Table 38.1. Cutting conditions

The potential of the collector at the same time is obviously equalV. CC. . In fig. 38.7 The case of a short circuit between the collector and the emitter is considered.

Other transistor malfunctions are given in Table. 38.2.

Fig. 38.7. The short circuit between the collector and the emitter, the transistor is in the condition of the cutoff:V. E. = 2.29 V, V. B \u003d 1.77 V, V. C. = 2.29 V.

Table 38.2.

As explained in Ch. 21, the transistor current is determined by the direct bias-emitter transition offset. A slight increase in this voltage leads to a strong increase in the current transistor. When the current through the transistor reaches the maximum value, it is said that the transistor is saturated (is in saturation state). Potential

Table 38.3.

the collector decreases with increasing current and when saturation is reached, it is almost compared with the potential of the emitter (0.1 - 0.5 V). In general, when saturation, the potentials of the emitter, databases and collectors are approximately at the same level (see Table 38.3).

The coincidence of the measured and nominal constant voltages and the absence or low level of the signal at the output of the amplifier indicate a malfunction associated with the passage of an alternating signal, for example, to an internal break in the separator capacitor. Before replacing the suspected condenser suspected, make sure that it is malfunction, connecting it parallel to it a working capacitor of a close nominal. Breaking the condenser in the Emitter chain ( C. 3 in the diagram in fig. 38.3) leads to a decrease in the signal level at the output of the amplifier, but the signal is reproduced without distortion. A large leakage or short circuit in this condenser usually makes changes to the transistor mode dC. These changes depend on the static regimes of the previous and subsequent cascades.

When searching for a malfunction you need to remember the following.

1. Do not make spellings based on the comparison of the measured and nominal voltages only at one point. It is necessary to record the entire set of values \u200b\u200bof the measured stresses (for example, on the emitter, database and collector of the transistor in the case of a transistor cascade) and compare it with a set of corresponding rated voltages.

2. With accurate measurements (for a voltmeter with a sensitivity of 20 kΩ / in achievable accuracy 0.01 c) two identical readings at different control points in the overwhelming majority of cases indicate a short circuit between these points. However, there are exceptions, so you need to fulfill all further checks for final output.

Features of digital diagnostics

In the digital devices, the most common fault is the so-called "sticking" when the level of logic 0 ("constant zero") or logical 1 ("constant unit") continues on the output of the IP or in the circuit node). Other malfunctions are possible, including IP conclusions or short circuit between printed circuit board.

Fig. 38.8.

Fault diagnostics in digital circuits is carried out by supplying signals of a logical pulse generator to the inputs of the checked element and observing the effects of these signals to the state of the outputs using a logical probe. For full check The logical element "goes out" the entire truth table. Consider, for example, a digital circuit in Fig. 38.8. First, the logical states of the inputs and outputs of each logical element are recorded and compared with states in the truth table. A suspicious logical element is tested using a pulse generator and a logical probe. Consider, for example, a logical element G. 1 . At its input 2, the logical level is constantly operating. To check the generator probe element, it is installed on the output 3 (one of the two element inputs), and the probe probe - on the output 1 (element output). When referring to the truth table of the element or, not, we see that if on one of the inputs (output 2) of this element, the level of logic 0 is valid, the signal level at its output changes when the logical state of the second input (output 3) is changed.

Table of truth elementG. 1

For example, if in the initial state, logic 0 acts on the output 3, then logical is present at the output of the element (output 1) 1. If you can change the logical state of output 3 to logical 1 using the generator, then the output level will change from 1 to 0 that and register a probe. The return result is observed in the case when in the initial state in the output 3 there is a logical level 1. Similar tests can be applied to other logical elements. With these tests, it is necessary to use the truth table of the logical element being checked, because only in this case can be confident in the correctness of testing.

Features of diagnostics of microprocessor systems

Diagnostics of faults in the microprocessor system with a bus structure has the form of a sequence of addresses and data that appear on the address bus and the data bus, and the subsequent comparison of them with a well-known sequence for the operating system. For example, such a malfunction as constant 0 on line 3 (D 3) of the data bus will be indicated by a constant logical zero on line D 3. Corresponding listing called listing of status,it turns out using a logical analyzer. The typical listing of the status displayed on the monitor screen is shown in Fig. 38.9. As an alternative, an anarted analyzer can be used to collect a bit stream called signature, in some node of the circuit and comparison of it with a reference signature. The difference between these signatures indicates a malfunction.

Fig. 38.9.

This video describes the computer tester for diagnosing personal computers such as IBM PC:

Sign No 1: Warning Indicators

We turn the key in the ignition castle hundreds, thousands of times and never give it much importance. Until the warning icons on the instrument panel are not lit, for which we have not paid any attention before. These light bulbs are connected to the sensors that control many systems of your car. As for the indicators notifying about the problems with the engine, they light up only when a high probability that is important and may refuse to work at any time. The three most important indicators include:

· Check Oil \\ Oil Level Low (check oil / low oil level)

· Oil Pressure Low (Low Oil Pressure)

· Check Engine (Check engine)

The "Check Engine" indicator is one of The main signs of the engine malfunctionand may mean many different things. The easiest way to find out what is not so with the engine, it is to connect the car to the diagnostic device. This device looks like a large calculator and interacts with the car systems through the connection port. After you give him an instruction to scan, it starts "Communication" with your car's computer to find out the reason why the warning indicator lit.

You can buy such a diagnostic device in almost any. But if you feel about the less practical type of people, then you can always contact the maintenance station, where you must have a device to determine the problems of the car.

Sign No. 2: Unstable Engine Operation

The engine of your car should guarantee relatively smooth and predictable work - the devices of ramps, twitching and oscillations. If not ... here is another sign of the car malfunction.

Otherwise, guess what? This is a very serious engine malfunction. The key to such behavior may be contaminated, clogging of fuel lines and fuel filters, malfunction of the engine control unit and many other factors. Probably the latest, whatever you want, it is unexpectedly accelerated or stagged on a busy area of \u200b\u200bthe road, where other participants exist in addition to your car. road. Unfortunately, you will not be able to eliminate the problem described above on your own, and it will be best to refer to specialists. And you need to do it as soon as possible. Accordingly, under specialists, we understand not the notorious "hundred" in Jora ", but a full-fledged car service with an unreplicable reputation. By the way, one of the indirect causes of engine malfunctions often serves to appeal to pseudo-commalists, which can not only not fix your car, but also simply sucking, in view of their illiteracy! But this is a completely different story.

Another one practical Council Serves oil change through the recommended time interval. Discipline B. timely replacement Oil helps you prevent dangerous situations with a car engine.

Sign of No. 3: Shots, Clicks, Crack and Screens in Engine

Shots, roasting and other loud sounds can enjoy only if you watch the fireworks, but not when you hear such a symphony from motor compartment Your car.

For example, tapping and cracks may indicate the detonation occurring in engine cylinder. This happens when gasoline is prematurely flammified in the combustion chamber of cylinders, and can lead to expensive damage to the pistons.

Crossing sound while you start the car, may indicate that the car starter must be adjusted or replaced.

Scripping or deaf blows while switching speeds, on the contrary, are not a serious problem. To eliminate these sounds, you just need to contact the service center. Most likely the case is in your transmission.

In some cases, the truth is noise, as ticking, can be quite normal. In the engines with direct injection, this sound occurs directly at the time of injection.

It is important one if you have doubts about , that try as accurately to track the area of \u200b\u200bemergence of foreign noise and all your observations are retributed to qualified specialists.

Sign No. 4: Unusual Smells

All cars with engines internal combustion Emit gases into the environment, which are simply not suitable for human lungs. That is why if you smell exhaust gases In the car, you must regard it as true sign Engine faults. The smell may be a sign that the oil and the coolant flows from the closed system.

Car exhaust gases contain dangerous gas for the human body. Therefore, as soon as you felt a foreign smell in the car's cabin, do not doubt, do not wait, but head straight to a hundred.

The smell of pale rubber also does not foreshadow anything good. Possible cause The emergence of such a smell can be the contact of the rubber hose important fluids With something that they should not concern. In such cases, it should also not be expected and solving the problem urgently, since in the future this can lead to expensive repair of other components.

Sign No5: Smoke Signals - Signal Signal to Auto mechanic (extreme engine malfunction)

If you see a thick smoke coming from exhaust pipe Your car, or an excessive amount of steam, the reason for this may be, and may not be, the engine problems. In any case, you must find out the cause, because Such problems do not pass by themselves.

Smoke from the exhaust pipe may mean that the pollutant has fallen into the fuel and air mixture. As a rule, the blue smoke arises due to oil entering gasoline. Of course, it is possible to leave this fact without attention, only if you are ready for additional expenditures on the oil, which will have to make the matter in the engine. But the best way out will troubleshoot. The white smoke indicates that the condensate of water or antifreeze was mixed with gasoline. Again, you can restore the loss of coolant or antifreeze with your own, but the smart solution will contact the specialists, and the earlier, the better.

If, after reading this article, you suddenly understood that one of the 5 main signs of the car malfunction is also your car, we urgently recommend contacting the nearest road professionals. In case of disappointing diagnosis, know that for your car you can always leaving an application on our website by filling out the form in the "Find Auto Parts" menu. Low prices will pleasantly surprise you, we guarantee you!