How to check the engine for air suction. We check the air seats in the intake manifold: symptoms and signs

Read 5 min. Views 440. Published on 08/01/2019

For engines to work internal combustion A mixture of air and fuel is required. The flammable compressed mixture pushes the pistons that turn crankshaftAnd the car begins to move. Air enters the engine through a small throttle. And to control the auxiliary devices a vacuum is created.

Consequences of air supply

The air drum will result in unwanted air into the engine where it is not provided. This reduces the engine performance and fails to malfunction of some systems that depend on vacuum.

Since the air secession causes the inefficiency of the engine, you will notice what lights up Check Engine" on the dashboard. You will also experience acceleration problems - this is because fuel is supplied inefficiently in the combustion chambers. Vacuum is used to activate drives, sensors or brakes.

When leaking a vacuum, some of the sensors can start working incorrectly, forcing you to unnecessary repairs.

Engine inspection

To determine the air seats, you must first understand how it works intake system Engine.

Air enters through the air filter. Throttle valve Controls it by creating a vacuum. Know that on the car drip, when he publishes a hissing sound after starting.

Vacuum hoses during operation wear out, become fragile. This leads to their damage. Carefully inspect the hoses on the engine and replace them if necessary. Engines differ from each other. To identify hoses, familiarize yourself with the repair manual.

Ways to check hermetic

There are several ways to check the tightness. Some of them are faster than others, and some require expensive equipment. Consider the following ways to find the best decision In your case.

1. Examine and check if there are no non-jet engines

First place to check vacuum leakage - engine hoses. Check for cracks or weakened fasteners. Each car has a unique diagram of vacuum tubes. Make sure the clamps are sufficiently tightened.

Try shifting the clamps on the side. If they are easily moving, then they need to be tightened. If you still can't determine the leakage place - additionally inspect the surface.

2. Spray soap water around the intake area

This is probably the easiest and cheapest way to check the air seats. Sprinkle soap water around the intake manifold and damaged hoses during the engine operation. You will see air bubbles in the leakage zones.

Watch the video on how to look for air seats with a soap solution:

3. Use the smoke generator

This is a professional way. It uses auto mechanics to test air supply for a few minutes. But for this you need expensive equipment.

4. Spray the carburetor cleaner

There are those who use a carburetor cleaner to detect air supply. To do this, launch the engine for idling. Spray the cleaner on the area you suspect in leaks. Engine turnover will begin to increase when there is air seats.

This is due to the fact that the carburetor cleaner will enter the engine and burns with fuel.

This is a dangerous method for checking air supply. Sprays are easily flammable. Prepare fire extinguisher!

Leakage in the intake manifold

If your hoses are in order, the problem can be with an intake manifold. The intake manifold laying from time to time passes, causing air seats. It is located between the head of the cylinder block and the collector.

To check the tightness of the intake manifold, install the car on the handbrake. Run the engine and let it work at idle for a few minutes.

Apply a soap solution in the area between the intake manifold and the head of the cylinder block or at the base of the carburetor. Listen to the sound emanating from the engine. If it is smoothed, then the air seats occurs on the intake manifold and requires repair.

Symptoms of air supply

The first sign of the air suction is the lighting of the "Check Engine" lamp. There are many reasons for the inclusion of this light bulb. You need to exclude other faults before you decide that this is a disruption of tightness. But be sure that this is the air seats, if it is accompanied by hissing from the engine and power loss.

Your car does not develop full power? It can be air seats.

Violation of tightness can cause additional engine problems, such as the inefficiency of fuel.

Repair of vacuum hoses

If you are damaged by a vacuum hose, you do not need to buy a new one. The hose is long. You can cut off the damaged part and join the engine again.

The most widespread damage at the ends of the tubes. Always check that the clamps are tightened to prevent further leaks.

After repair, start the engine and leave it at idle. Listen to any hissing sounds.

If you decide to replace the vacuum hose, take the same in length and diameter. Vacuum tubes are designed for specific places, such as brake amplifier or PCV (crankcase ventilation system).

Conclusion

The presence of air supply can lead to a slow acceleration of the car. It can also prevent efficient mixing of fuel and air in combustion chambers. Damaged hoses are the main perpetrators of vacuum leaks. You can eliminate small leaks in the hoses, cutting off damaged parts. If it does not work, you will need to buy new ones.

The car is a complex mechanism in which everything should work perfectly. Otherwise the risk of an accident is seriously increasing, moreover, one faulty detail It may lead to premature depreciation of the entire system. So that this does not happen, you need to carefully treat your iron friend and record all the faults in time for their speedy elimination.

The engine is the heart of the car. Without its normal functioning, the possibility of movement vehicle. A negative role in the work of this node is played by air seats in the intake manifold. If this defect appears in your car, the engine will be able to stall in the middle of the road.

Essence and symptoms

The essence of the fault

When the sublict appears in the intake manifold, then much more air begins to enter the engine than. Naturally, it negatively affects the work of the entire system.

Important! The result of the appearance of air supply in the intake manifold is the depletion of the fuel and air mixture.

When this symptom is activated - the motor begins to work unstable. Depending on the seriousness of the breakdown, a list of possible symptoms can vary greatly. Therefore, detect a fault is not so simple.

Symptoms of engine suspension

For many years by car owners and car experts A whole list of symptoms, which may indicate that the engine suits air through the intake manifold:

1. On the idling The engine is unstable. With such a symptom, you simply will not be able to set idle below the mark of 1000 revolutions. Each attempt will turn off the motor disconnection.
2. Temperature changes. The engine will start often overheat. Plus it will not depend on the ride mode chosen by you.
3. Difficulties at start-up will be especially noticeable in the morning.
4. On low revs, the motor power will strongly fall. When less than 2000 revolutions, the machine will not be able to develop speed.
5. Fuel consumption will grow strongly.
6. When driving on 2000 revolutions and there are no more problems.

Each of these symptoms indicates that there is air seats in the intake manifold. Therefore, if at least one of them is detected, you need to conduct detailed diagnostics and determine the fault.

We carry out diagnostics and eliminate the subference

To start, get the engine. He must work at idle. After that, listen to the device. Highly often you can hear the characteristic hissing of the air.

Attention! By the source of hiss you can find a breakdown.

In some cases, it is not possible to localize the noise source. In this case, you will need to take the hoses that are connected to the collector. In most situations, problems are observed with a vacuum hose, which is responsible for strengthening the brakes. But exceptions are possible.

Sometimes during the removal of the clamp, the power leap can be observed. In this case, the problem lies in this detail. Usually, the like says about such faults as:

• adsorber valve breakdown,
• the failure of the vacuum amplifier,
• hose holes.

If, after the manipulation proceeds done, the problem is never detected - you must use the sprayer. A combustible liquid is poured into it. It is best to use special cleaners for carburetors.

Thin slim spray liquid into potential places through which the air drums in the intake manifold presumably occurs. With special care you need to process:

• bUK GBC,
• collector's butcher
• corrugation
• seams receiver
• a throttle bog.

As soon as the liquid falls on the damaged area, it will draw inside and turn out to be in the motor. At the same time, you will observe the jump of turns.

The most effective method

In order to use this method of detection of air supply in the collector, you need to find a smoke generator. Further, select any opening of the intake path and start slowly pumping the smoke inside the system.

Attention! It is better to use as a consumable motor oilIt provides a large amount of smoke.

Further to find the air seats in the intake manifold take the halogen lamp. With it, you can easily find the stream of smoke. For the procedure, you will need special adapters.

Eliminate malfunction

A lot depends on where you detect air seats in the collector. For example, if the slot on the hose is small, you can use the sealant and smell damage. Of course, ideally the spoiled element must be replaced. Very often this operation must be done with couplings, sealing rings and gaskets.

RESULTS

Air seats through the intake manifold is the easiest to be diagnosed with a smoke generator. The elimination of the defect directly depends on where the breakdown was detected.

In the event that the fuel system is delivered diesel engineThe malfunction can manifest as constantly at startup after a long downtime, and for a long time not to remind yourself. It depends on the intensity of air supply. The main symptoms of air entering the diesel fuel system independently of the modification power aggregate are:

• the diesel engine is easily launched "on the cold", but further work does not differ in stability;
• , the reaction to the press of the gas pedal becomes sluggish and slow;
• after the parking, the unit needs to be twisted longer than the starter, then it takes place and the symptoms described in the first case are repeated.
• as the malfunction is progressing, diesel from the starter is no longer started, it is not always possible to start the engine even with the help of starting devices or a jerk on a tug;

For a more accurate determination that the cause of the problem start is air in the diesel fuel system, it is necessary to produce a visual analysis of fuel flow into the cylinders. For this, diesel motor from 30 to 50 seconds. You need to turn the starter to fill out the exhaust production path, and then the analysis of exhaust gases.

If the fuel feed is normal, then even when taking into account that the motor does not start, from exhaust system It will still be a small amount of smoke. Often smoke will have a grayish tint. In rare cases, the smoke can be in the absence of fuel supply. This suggests that the cylinders get an excess amount of oil, but such. It is worth noting that to diagnose this failure color malfunction can only be conditionally.

Read in this article

Possible air suction places

Encavating the fuel feed system can occur both unexpectedly and become the result of recently implemented repair work. Air can penetrate the fuel system of a diesel engine from different places, and the total number of potential "windows" will directly depend on how many years the TC is in operation and in what conditions a particular car is operated.

The fuel system is delivered both with loss of tightness in the main highway and in the opposite. Violation of seals in the highways makes the diesel fiber back to fuel tank. The engine can start after idle due to the fact that the cavities remain fuel, but then the diesel is quickly stalls and re-not start.

The air in the diesel engine fuel system may be due to the fact that the compaction seal is broken, the rubber fuel hoses have crackled, the clamps deteriorated. Also from corrosion can suffer fuel lines, especially in a junction with a fuel filter.

Disturbation of the fuel-pumping pump can be caused to trusting. Special attention deserves a highway for reverse fuel plum on nozzles (reverse), as a frequent phenomenon becomes a disturbance of the tightness of the fuel lines in this area.

Another place to penetrate air into the fuel feed system may be the fuel pump itself. Disturbation of the sealing of the drive shaft or the pump cover will lead to the air pump climb. Also in the design there are other places on the pump that can pass the air. Add that the diagnosis of the fuel pump high pressure It is necessary to carry out specialists for the repair of diesel equipment.

How to detect air seats yourself: highways, tntwd, return

The elimination of other possible causes suggests the presence of air supply to the fuel line. Begin troubleshooting is necessary with a detailed visual inspection. motor compartment. The next step will be the inspection of the lower part of the car. Detect noticeable cracks and other pipeline defects, sweels of diesel fuel and wet spots are easy enough.

If the system is delivered, but explicit signs of tightness disorders are not visible, then for further diagnostics it is necessary to turn off the fuel pump from the fuel lines. Then a separate clean container will be required, in which you will need to pour up to 5 liters of diesel fuel without any impurities. We will also need 2 clean from the inside and outside the hose (about 60 cm. In length), and two more clamps. Remember that cleanliness is extremely important with any work with fuel equipment, since the ingress of the slightest particles of garbage in the pump can lead to its failure and subsequent expensive repair.

After disconnecting from the TNLD of the fuel feed line and the returns, the cooked hoses are installed on their place, which are lowered into a container with a pure clean diesel fuel. Next, it is necessary to fix the hoses in the tank so that they do not move. For this, they are creating them on the pump with clamps, and in a separate tank for fuel in any convenient way depending on the type of container used.

After that, it is necessary to remove air from the fuel chamber of the pump. It should be noted that the solution is to simply turn the motor starter so that the pump begins to affect the diesel fuel from the tank itself, is incorrect and urgent is not recommended. Right ways Solutions of the problem are several. The most simple, which will help answer the question, how to remove the air from the diesel fuel pump of high pressure directly in the garage.

For this, the tank with diesel fuel must be raised above the level on which the TNVD is located. Next, you need to find a place where the pump is located on the pump to drain fuel. This place will need to carefully launder to eliminate any dirt entering. Then the bolt of the fitting can be turned out, and through the opening opening the air. Pumping produce srinting, special vacuum pump etc. The air is pumped up to the moment until diesel fuel appears from the hole. After that, you can screw the bolt in place and start the engine for a couple of minutes. Run is needed for final air removal.

To the second way there is a solution to remove the fuel supply hose from the pump and start sucking the fuel until it goes with a dense stream. Next, the hose can be put on the fuel pump fitting and clipped with a clamp. Then the bolt is unscrewed on the reverse line fitting, and the air exits independently. After all the procedures, diesel starts a few minutes to completely remove air residues from the pump. Run can once again repeat some time after some time.

At the end, the tank with the diesel fuel is higher than the pump level. Further, the car is left for 8-10 hours. If after downtime diesel started normally, this suggests that air falls into the fuel system, and this happens through the fuel line. The next stage of diagnostics becomes the placement of tank with diesel fuel so that it turns out to be lower than the level of the TNVD. After that, the car leaves again for 8-10 hours. If after downtime diesel did not start or the launch is accompanied by problems, then the air drowsiness is likely through the pump or the "returns" on diesel nozzles.

In the second case, it is necessary to take into account that it is not constructively in all diesel engines the return highway with nozzles is excreted on the pump. The placement location can be a fuel filter, fuel filter highway. If this is the case, then the method described below can not be applied.

To clarify the location of the fault, we run diesel and drive the air. Capacity with fuel again put below the pump level. Tubes that are responsible for the inverse reverse and are connected to fuel pump, you need to take tight. Machine can be re-left for 8-10 hours. If diesel after downtime, it started normally and works steadily, then the air drums occurs through the return highway of diesel injectors. In the event that the problems that occurred and had previously appeared when trying to start the motor, manifested themselves again, then this indicates the air seats through the TNVD. The pump with such a malfunction requires repair in a specialized workshop. There is also no rare cases when in the diagnostic process several places are revealed at once, where tightness is impaired.

The fuel filter is also checked during finding the place of entry. Verification is carried out according to the scheme: Capacity with diesel fuel filter - TNVD. Capacity with combustible is placed below the pump level. If Sutyesk B. fuel filter Not identified, in a similar way, the pumping pump is checked.

The lack of explicit problems with the fuel pump, the pumping pump, the invertation of nozzles and fuel lines may indicate the air in the fuel system of diesel engine through the fuel tank. For more accurate diagnostics, it is necessary to apply to a service station, where experts will check for tightness with highly specialized professional equipment.

Read also

Causes of vibration and unstable work diesel engine In mode idle move. Possible reasons and malfunction diagnostics.

A bubble of air in the heart of a person leads to death. The air that fell into the heart of the car - the engine leads to less tragic consequences, but also fraught with great troubles, can stop it forever.

Also, as a normal person constantly monitors the state of his body, a normal motorist constantly monitors the "health" of his iron friend. The "body" of the car is, of course, less complicated than the human, but the causes of various problems and failures, especially if the car is no longer young.

This is despite the fact that such a problem as, for example, air seats, it happens in a completely new car. Of course, it is rarely inherent in expensive modern foreign cars, but domestic cars Quite often suffer from such a "illness".

The cause of the suction is often the aggregates supplying the fuel-air mixture into the engine, which, of course, can affect its operation. For example, it may be that the car starts, but after some time it ceases to respond to pressing the accelerator pedal. Further, as a rule, the problem should be deepened when the engine manages to start only with large and repeated starter efforts.

If the car does not start at all - see whether fuel fuel is in cylinders. It is quite simple to do this - you need to see - is there at least a light smack of exhaust pipe When trying to start. Of course, it is not easy for this, but anyone, even a child can help.

A modern car is not just a means of movement, but also a very complex mechanism, even a group of mechanisms, and therefore the causes of the fuel failure into the engine can be a set. SAMI frequent cause - Problems in the fuel-conductive highway. It may be hose wear, and a fuel pump disorder, a filter with poor-quality or worn seals, corrosion of fuel tubes,. This problem may suddenly manifest itself after repairing the car, when non-associate or simply unqualified "specialists" broke the tightness of the compounds of individual elements of the fuel system.

Air enters the engine cylinders with different paths. Perhaps from the atmosphere, this is happening in cases where the air can be supersed from outside, and maybe penetration from indoor space Engine. Anyway, in any case, it shows that in the fuel system there is a disruption of the system tightness and it requires immediate elimination.

Air seats are only the beginning of problems that can lead to the failure of the engine. Air, getting into the combustion chamber, does not give a working mixture to fill the volume in necessary quantity- It increases the combustion time of the mixture and, accordingly, the engine loses power when trying to increase the load. The driver at this time may notice interruptions in the engine and deaf sounds, escaping from the exhaust pipe, can also be noted that the engine overheats too quickly. Overheating - Cause of ignition fuel mixes Even until it gets into the combustion chamber, and this will inevitably lead to the engine breakdown, if it does not react in time.

In the event of a malfunction, as usual, you can try to eliminate the breakdown by your own, but this is only if there are certain skills. If there are no such, then it is better to refer to specialists who will spend thorough diagnosis and qualifying a malfunction.

When the car, when starting from a place (sharp) begins to chop up on a second, and in some cases it even stalls - this is 99% air drum. Since the excess air falling into the engine cylinders causes a sharp and, as a result, the difficulties of ignition. Motor Troit and can stumble at idle.

In this article we will learn to determine:

Symptoms of air supply

Symptoms of air supply engine most often unambiguous:

1. Uncertain.
2. Unstable idling - idling speed is constantly changing below 1000 rpm. The engine may sall. On a car with a carburetor engine, the quality screw and the amount becomes insignificant to adjust the XX mode as the air goes into contact of the XX channel.
3. Falling power - in the intake path on systems with MAF () - low revs idle move; On systems with a MAP sensor (absolute pressure sensor), on the contrary - increased turns of XX, lambda errors, poor mixture, ignition skipping.
4. Increase fuel consumption - To touch and continue moving, you need to constantly keep high speed, while longer is on reduced gear.

Air support location

To the main places through which the sublicas can occur, refers:

• laying intake manifold;
• gasket on throttle damper;
• plot of a pipe Ot air filter to throttle assembly;
• sealing rings nozzles;
• vacuum hoses;
• adsorber valve;
• idling regulator (if any).

Separately, it is worth considering the air seats on carburetor engines - There are no electronics, and air can only suck on a vacuum amplifier or somewhere in the carburetor.

Space Places (Carburetor)

1. At the screw quality of the fuel mixture.
2. For the gasket under the carburetor - plots with soot the correct sign.
3. Through not dense adjacent throttle.
4. Through the axes of chokes.
5. The integrity of the diaphragms of the choke damper, economizer or launcher.

Air seats in the diesel fuel system

In the diesel engine's fuel system, delivering occurs, as a rule, due to the leakage of the low-pressure fuel tube tubes (from the tank to the filter and from the filter to the TNVD).

The cause of the suction on the diesel car

The air seats in the leaky fuel system occurs because the atmospheric pressure is higher than that, which is created when the pump of the sucking suolanter is created from the tank. It is almost impossible to detect such depressurization.

On modern diesel engines, the air supply problem in the fuel system is much more common than on the diesel engines of the old sample. All through changes in the construction of fuel hoses, since they used to be brass, but now make plastic quick-consumptionwho have their own lines of operation.

Plastic, as a result of vibrations, has the property to be stitched, and rubber sealing rings are inhabited. Especially brightly, such a problem is manifested in winter on cars with mileage of more than 150 thousand km.

The main reasons for the suction, often:

• old hoses and weakened clamps;
• damaged fuel tubes;
• loss of seals on the connection of the fuel filter;
• disrupted tightness in the return highway;
• the separation of the drive shaft is broken, the axis of the fuel flow control lever or in the PTW lid.

In most cases there is a banal aging rubber seals, moreover, the fuel system can be delivered during damage to any of the branches, both direct and reverse.

Signs of air supply

The most vapor and common is the car in the morning or after a long idle, stops quickly starting, it is necessary to turn the starter for a long time (while there is a small smoke from the exhaust - this will indicate the flow of fuel into the cylinders). The sign of a large suction is not only a heavy launch, but also when driving begins to stroke, and told.

Such behavior of the car is due to the fact that the TNVD does not have time to pass through itself the foam only on high revolutionsAnd at idle does not cope with a large amount of air in the fuel cell. Determine the same that the problem in the operation of the diesel engine is related to the air seats, will help replace the full-time tubes on transparent.

How to find a suction in the diesel fuel system

The air can be draped in the connection, in the damaged tube or even in the tank. And you can be found by exclusion, or submit pressure into the system for discharge.

Most the best and reliable way - Find a looseness of the exclusion method: to each section of the fuel system, connect the receipts of the diesel fuel from the tank, but from the canister. And alternately check - immediately connect to the pump, then it will connect already in front of the sump, etc.

Faster I. simple option Determine the scene will be supplied to the tank. Then in the place where the air suits, either hissing will appear, or the connection will start mocking.

Air subcosition in the intake manifold

The essence of the air supply in the inlet path is that the engine together with the fuel comes with an extra and unaccounted DMRV sensor or DDA air, which leads to the depleted fuel-air mixture in the cylinders. And this, in turn, contributes to the wrong engine operation.

Cause of air suspension

1. Mechanical impact.
2. Overheating (affects the elasticity of gaskets and sealants).
3. Excessive abuse of carburetors cleaning (severe sealant and gaskets).

Most problematically find air supply location in the gasket area Between the GBC and the intake manifold.

How to find air seats in the collector

On the gasoline engines Unaccounted by air sensors falls into the intake manifold through loosenability or damage to the air ducts, the projected seals of the nozzles, as well as through the hoses of the vacuum brake system.

With standard scene sites figured out, now it is also worth finding out how to look for air seats. For this, there are several basic search methods.

Simple Cigarette Smoke Generator

Oil smoke generator with his own hands

The easiest way to check is whether air seats in the inlet path after the flow meter - unscrew the air pipe along with the sensor from the air filter housing and start the engine. Then cover the knot with a hand with a sensor and look at the reaction - if everything is normal, the motor must be stuck, strongly squeezing the nozzle after the air sensor. Otherwise, this will not happen and most likely it will be possible to hear hiss. If you cannot find the air subroar such by this method, then you need to continue searching for other available ways.

Often, it is often looking for a suction or with a hose with a spraying of probable places with combustible mixtures, such as: gasoline, carbcliner or VD-40. But most effective method Searching the location of unaccounted air is the use of a smoke generator.

Search for air sucking

As a rule, problems with the XX as well as the appearance of the error of the depleted mixture, only with a strong scene. An insignificant sample can be determined when observing fuel correction at idle and increased rev..

Checking air supply, sneaking hoses

To find the place of leakage of unnecessary air, we launch the engine and give him some time to work, and at this time we put the ear in the Ear and try to hear hiss, and if you failed to leave, then we move the hoses that go to the intake manifold (from the fuel pressure regulator, vacuum amplifier, etc.). When changes in the engine work are observed after squeezing and release, it means that a malfunction in this area is observed.

Also, sometimes applied compressed air search method. To do this, it is necessary to close the nozzle from the filter on the plugged engine and swing air through any tube, previously treated with a soap solution of the entire inlet path.

Search for air sucking by gasoline

How to detect sawing spraying

Set the place where the air seats in the engine goes, effectively helps the method of spraying connections of connections of some combustible mixture when the motor running. It can be both ordinary gasoline, and the cleaner. The fact that you found a place where it suits, tells the change in engine speeds (will fall or increase). You need to dial in a small hot mix syringe and a thin flowing splash all the places where the sublicas can be. After all, when gasoline or other combustible fluid falls into place of tightness impairment, then in the form of vapors immediately seeps into the combustion chamber, which leads to a jump or drop of revolutions.

When searching for sawmills, it is worth splashing on:

1. The rubber pipe from the flow meter to the idle regulator and from the RCH to the valve cover.
2. Connecting the intake manifold from the GBC (in the place where the gasket is worth).
3. Connecting receiver and choke pipe.
4. Pasters nozzles.
5. All rubber hoses in places of compound clamps (intake corrugation, etc.).

Checking the presence of sucking with a smoke generator

The smoke generator has little lying in the garage, so this method of searching for disruption of tightness in the system is mainly used for a hundred. Although if in garage conditions The subcomet methods considered above could not be found, you can make a primitive smoke generator, although the usual also has a simple design. Smoke is injected into any hole in the inlet path, and then begins to leak through the cuts.