Malfunctions of mufflers on VAZ 2108-2109 and the procedure for replacing them

The car muffler has failed, what to do?

There are situations when the muffler burns out or even falls off. In this case there are two options:

• The VAZ 2109 muffler is being replaced;
• old one is being repaired.

General view of the exhaust gas removal system

Positions: 1- exhaust pipe; 2 – resonator; 3 – main muffler.

Installing a new muffler

The work is carried out on an overpass or inspection pit. Before replacing elements of the exhaust gas exhaust system, it is necessary to secure the vehicle with thrust bars, placing them under the rear wheels. To replace the muffler you will need:

• new muffler;
• liquid for removing scale on connecting fasteners WD40;
• keys for “13” - two pieces;
• extension for key.

The order in which the muffler is replaced on a VAZ 2109:

• Unscrew the nuts securing the muffler pipe clamp to the resonator pipe.
• The clamp is removed.
• The pipe is disconnected and the sealing ring is removed.
• The rubber suspension cushions are removed. To do this, the muffler must be raised.
• The muffler is lowered to the ground and pulled out from under the car.
• The new muffler is installed in the reverse order in which the old muffler was removed.

Tip: When installing a new muffler, it is best to replace the o-rings with new ones. This will ensure a tight connection.

How to replace the muffler yourself can be clearly seen in the video.

Installing a new resonator

So:

• The resonator pipe is disconnected from the receiving pipe after the clamp is loosened.
• It is removed from the rubber cushions when the device is lifted up.
• In the reverse order in which the old resonator was removed, a new one is installed.
• Under the bottom of the car, the nuts securing the exhaust pipe to the bracket are unscrewed. The bolts securing the bracket to the car body are unscrewed, which is then removed.

Installing a new exhaust pipe

Detaching the bracket from the body

• The exhaust pipe is freed from its attachment to the exhaust manifold.
• The exhaust pipe of the muffler is disconnected from the resonator pipe.
• The sealing ring is removed.

Removing the O-ring

• The exhaust pipe of the muffler is removed.
• The muffler exhaust pipe is installed in the reverse order of removal. The tightening torque for the nuts securing the pipe to the manifold is from 2.1 to 2.6 kgf/m.

Tip: It is better to apply a thin layer of exhaust gas system sealant to the pipe joints before installing them on external surfaces.

When dismantling and installing a new muffler, the places where the coolant leaks are clearly visible. These may be deteriorated, rusty plugs. In this case, it is necessary to replace the VAZ 2109 plugs. The engine parts are most susceptible to wear. Therefore, first of all, you need to replace the plugs on the VAZ 2109 cylinder block.

This is interesting: Diagnosis of faults and repair of fuel injectors with your own hands

How to replace the rear part of the muffler, also known as the main muffler, on VAZ 2108-VAZ 21099 cars?

Removal: 1) First, remove the O-ring and the clamp that holds the resonator together and the rear part of the muffler by unscrewing the two nuts securing the clamp. (You will find how to remove the fastening clamp in the article: “Replacing the resonator”, paragraph “1-2”)

2) Then remove the three suspension cushions from the muffler, to do this:

• First, using a screwdriver, remove the front suspension cushion from the bracket of the rear part of the muffler.

• Next, without removing the screwdrivers from your hands, disconnect the rear suspension cushion from the bracket in the same way.

• And to complete the operation, disconnect the side airbag from the left side of the rear muffler.

Note! Replace all torn pillows, as well as hanging pillows that have lost their elasticity, with new ones!

3) After removing the airbags, remove the rear part of the muffler from the vehicle.

Installation: 1) First install the new rear muffler onto the front suspension mount.

2) Then onto the side hanging pillow.

3) And at the end of the operation, install the muffler on the rear suspension cushion.

4) After completing the suspension of the muffler, connect the rear part of the muffler to the resonator by inserting an O-ring between them, and installing a fastening clamp on top of the ring. (For more details, see the article: “Replacing the resonator”, paragraph “2-3”)

The muffler from the VAZ 21099 is replaced if there is a loud roar. In this case, you will have to replace the failed corrugation or the entire main part.

Types of mufflers for creating dual exhaust

When making a double exhaust for VAZ cars, the correct choice of mufflers is important. Thus, there are types of mufflers for exhaust systems:

• Resonator mufflers are usually made of high-quality perforated pipe with a surrounding chamber. It is the surrounding chamber that provides muffling of noise that has a certain frequency. Sometimes several resonators can be installed.
• The “standard” type muffler is represented by a system of partitions that resemble a labyrinth in their structure. The partitions allow the exhaust gas to be cooled, and when passing through such a system, the sound is significantly quieter. They can be equipped with perforated pipes.
• The third type is direct-flow systems. They also have a noise reduction system, but it is represented by special filters and fibers that are installed in the middle of the pipe itself. That is why the service life of such a muffler is limited by the useful life of the fibers inside the direct-flow muffler.

A special feature of this type of exhaust pipe is that it can dampen engine exhaust sounds quite weakly.

Making your own dual exhaust

If you have the time, materials and necessary technical means, you can make a double exhaust for a VAZ car yourself. You will still have to purchase the main parts of the exhaust system. However, when manufacturing an exhaust system, you can save significantly, at least on the purchase of parts.

Experienced motorists have long developed two main options for manufacturing double exhaust for VAZs.

1. The first option involves manufacturing an exhaust with different angles of both exhaust pipes. With this option, the second pipe is simply welded from the side into the pipe that comes from the manifold. When the car is idling, the exhaust gases exit the pipes almost uniformly, but at high engine speeds, most of the exhaust exits from a straight pipe that comes from the manifold.

1. A different version of the exhaust system will ensure the same amount of exhaust gases from both pipes. In this case, you need to weld two pipes with the same angles and turns at even angles to the pipe that comes from the collector. This can give the structure a more aesthetic appearance.

After choosing your exhaust system design, you need to move on to the next step of installing your own dual exhaust design. When installing a self-made structure, problems may arise with pipes deviating from the location of the old holders. But this is not a big problem, since they can be made and installed independently.

Remember that before installing your own exhaust, it must be wrapped with asbestos cord, which will provide thermal insulation. It is extremely necessary in order to avoid fire, since the fuel system is located dangerously close.

As for the installation process, it is identical to the one mentioned above.

To become more familiar with all the nuances of manufacturing and installing dual exhaust on VAZ cars, we bring to your attention a video with a more detailed description.

Design Features

All domestic cars have approximately the same exhaust system. This greatly simplifies the issue of self-repair without the involvement of specialists.

The exhaust system (ES) includes several main components.

Main components and fasteners
The entire exhaust system of the VAZ 2109 car is in a suspended state and is held in place by the presence of rubber mounting hangers. The hangers, in turn, are screwed to the bottom of the car.

Popular faults

The exhaust system itself, together with the muffler, is quite reliable and durable due to its simple design.

Frankly speaking, there is nothing to break if you compare the aircraft with the engine, fuel, oil system, and so on.

The most common and unpleasant situation that can happen to an aircraft on a VAZ 2109 is a broken muffler. This is due to the quality of our roads, or rather to their absence.

Features of the system design

The structure of the exhaust gas removal system has a similar structure on all domestically produced cars. One such example is the VAZ 2109.

The exhaust system of the car in question has the following structure:

• Receiving type pipe. A special-purpose probe is mounted in the pipe cavity. The capabilities of the device include processing the composition of emitted gases, which makes it possible to analyze the mixture used as a flammable liquid and, according to incoming data, make the necessary changes, which implies monitoring the quality of the liquid;
• A catalytic converter is installed after the exhaust pipe. The functions of this element include cleaning the gas mixture from harmful elements, which is the main task of the excretion system;
• Additional muffler. This element is fixed using a clamp. Its mounting location is located on the catalytic converter. An additional muffler is installed to reduce the sound waves generated;
• Main muffler. This element is secured to the additional muffler using an identical clamp. Its function is comparable to that of an additional muffler.

Paying attention to the exhaust system of the new VAZ 2109 car, you will notice that it is installed on rubber mounting hangers screwed into the bottom

How to replace the muffler on a VAZ 2108/2109

Depending on the extent of the damage, it will be necessary to remove and replace either the entire element or only some part of it. Each operation is performed quickly and easily, the main thing is to prepare in advance all the necessary tools:

• socket head 13;
• socket wrench 13;
• ratchet;
• flat blade screwdriver;
• WD-40.

How to remove the main muffler

The easiest way to perform this procedure is on an overpass or inspection hole. If possible, you can also use a lift. However, most often, car owners simply lift the left rear part of the car on a jack and dismantle the muffler while lying down.

It is necessary to wait until the exhaust system cools down after a trip, as you can easily get burned if it comes into contact with hot metal. Then you can start working:

• Disconnect the main plug from the resonator. To do this, you need to find the tie (clamp) and unscrew the fastening bolt. If the bolt does not come off, you can spray it with WD-40.
• After the bolt is unscrewed, you need to remove the pipe fasteners and pull the muffler out of the resonator.
• Next, you can remove the hanging elastic bands - usually the main mechanism is easily freed from them.
• The main muffler has been completely dismantled; you need to pull it out from under the car.

Stuck and rusted bolt connections can delay the dismantling process

Removing the additional muffler (resonator)

We will start from the fact that the main plug has already been removed, since dismantling the resonator will require its removal:

• Disconnect the resonator from the exhaust pipe. To do this you will need to unscrew two bolts.
• If the bolts are rusty, you can again use WD-40 lubricant.
• After unscrewing, you need to lift the resonator and disconnect the product from the hanging rubber bands.
• If the rubber bands cannot be removed, you can pry them off with a flat-head screwdriver.
• After which you can pull out the resonator barrel from under the car.

To remove the resonator from the rubber bands, just slightly lift its body and remove the pendants from the hooks

How to remove the exhaust pipe (catalyst)

This part of the exhaust system almost never fails. It connects directly to the exhaust manifold, so before dismantling you will need to jack up the front of the car:

• All the nuts that secure the pipe to it are disconnected from the manifold.
• The catalyst is carefully pulled out from the rubber hangers.

The only thing that can cause difficulty is unscrewing the nuts at the inlet to the manifold. Since they are located next to the engine, they heat up more than the fasteners on the resonator or muffler. Therefore, the nuts can simply stick to the metal.

The catalyst is dismantled very rarely, as it usually does not burn out or become deformed throughout the entire period of operation of the vehicle.

How to install a new muffler

Installation of a new product should be carried out in the reverse order of removal. Usually there are no problems with this procedure. However, the car owner should know the basic nuances of replacement:

• It is imperative to change the reinforced seals in the system.
• It is also advisable to replace the suspension rubber bands with new ones, however, in general, replacement is carried out at the discretion of the owner (if the suspension bands remain elastic and do not have cracks, then they can still be used).
• To replace all bolts, it is recommended to buy products made of bronze and other heat-resistant materials. All parts of the muffler are subject to heat, so the bolts and nuts must be as reliable as possible, otherwise after the first ride they will stick to the metal.

Video: replacing the muffler VAZ 2108–2199

Wiring on both sides

The dual exhaust system is not typical for VAZ 2108–2109 cars. However, if you move the muffler on two sides, you can achieve quieter running and more productive engine operation . Although not all VAZ drivers agree with this thesis:

The double muffler really gives the car a more solid look. In addition, the wear of the pipes will not be as fast, since two devices are in operation at once. It is recommended to weld a second exhaust pipe immediately after the resonator and route it to the right side of the bumper. It is better to entrust welding work to professionals, since the quality of the exhaust will depend on the quality of welding.

You can use rubber bands to hook the new muffler - again, you will need to weld the hooks to the bottom in order to hook the mechanism onto them. Some car owners make special rubber blocks that include mufflers, avoiding the hassle of rubber bands. This is a more reliable way of wiring two “jammers”, although it requires large investments.

In this case, double nozzles are used for each muffler

Thus, every owner of a VAZ 2108–2109 will be able to easily identify malfunctions in the exhaust system and replace the muffler with a new one without contacting a service station. By the way, drivers of “eights” and “nines” are advised to prepare in advance for problems with mufflers, as they will fail quite often.

• Print

Copywriter, needlewoman, traveler

Home →

Maintenance and Repair →

This is interesting: Gas equipment for a diesel engine - savings on every trip

Main malfunctions of VAZ 2109 and 2108 mufflers

There are several typical muffler breakdowns that owners of VAZ 2109 and VAZ 2108 cars encounter:

• Holes appear in the main muffler housing. Due to high temperatures accompanied by strong vibration, the case simply burns out. The cause can be either thermal or chemical corrosion. The problem is solved by applying a patch and subsequent welding of the damaged body;
• The muffler constantly overheats. As a rule, this occurs due to coking of the holes in the resonator partitions. In this case, hot exhaust gases accumulate in the silencer, and engine power rapidly decreases. To eliminate the problem, the muffler body is opened, damaged resonator partitions are replaced with new ones;
• The muffler is ringing. Ringing in a muffler occurs when the resonator partition in its body is completely or partially torn off. The problem is eliminated in the service using spot welding;
• The muffler is knocking. This is observed when one or more mounting hangers are broken. After this, the muffler body begins to dangle under the bottom of the car, periodically hitting it. It is not possible to fix such a breakdown on the road. The only way out is to slow down to a minimum and drive to a car service center with an inspection pit, where mechanics can replace the broken fasteners.

Tips for choosing the right muffler for tuning

• The main attention should be paid to the weight of the muffler and the quality of the metal from which it is made. The greater the weight of the muffler, the better.
• Check the quality of the welds: they should be smooth and not very thin.

• You also need to look at the painted areas of the muffler. If you detect even the smallest area of ​​paint chipping, there is no need to take it: this is the first indicator that the muffler is already susceptible to corrosion processes and will not serve you for long. Most of the options on offer are now made from alloys or stainless steel.
• Pay attention to the length of the new muffler and its attachment points to the body.

For a VAZ car, you should choose a muffler that completely suits you in terms of design and level of noise absorption, because it is the one that can ensure comfortable movement in the car.

Design features of the part

1. Dissipative. This device has a simple design and effectively dampens noise waves. Among the disadvantages of such a unit, auto mechanics highlight the lack of environmental friendliness.
2. Reactive. The operating principle of this device is the addition and mutual elimination of sound waves.
3. Combined. The direct-flow unit minimizes power loss, and the labyrinth unit improves sound damping.

Experts include the reasons for dismantling the old and installing a new unit of this type:

Signs by which a car enthusiast can understand that the muffler needs to be replaced:

Before you begin replacing the muffler, you will need to select one of the above-described types of this unit. VAZ 21099 car owners often buy a tuned model.

Next, you need to unscrew the ground nut and remove the wire from the stud. Then remove the nuts that secure the supply pipe of the cooling system. The seal gasket should be replaced and the nuts securing the exhaust manifold should be unscrewed. Then disconnect the last manifold and remove the corresponding gasket.

Exhaust system repair

Muffler failure can occur from mechanical shock or exposure to harmful chemical elements and moisture. In this case, the device can be repaired at a car service center or with your own hands.

Repair of VAZ 2109 muffler with small cracks and burnouts

So:

• Initially, it is necessary to dismantle the muffler. The procedure itself is not too complicated; the time it takes to complete it will depend on the type of muffler mounting and the skills of the motorist. The main difficulty when unscrewing the device is to remove rust on the fasteners, which contributes to the parts sticking to each other.
• After removing the element, it is necessary to carry out a thorough diagnosis and determine the reason why the muffler malfunctioned. A thorough visual inspection of the external and internal surfaces will give an idea of ​​the nature of the problems that have arisen.
• If no visible defect is found on the outer surface, there are no burns or through holes from rust, then most likely the underlying cause of muffler failure will be a problem with the internal resonator. In this case, it is necessary to repair or replace the resonator. The old device is cut out using welding tools and the new one is welded. Welding and repair of the product is carried out in compliance with work rules in accordance with safety regulations.
• When small external burnouts are detected, special means are used to repair the muffler. Many auto stores offer various sealants for sealing cracks.
• Before applying the sealant, the edges of the crack are thoroughly cleaned of soot and rust is removed. This is done immediately before applying the sealant. A greater effect is achieved if the instructions for applying the material to the surface to be repaired are strictly followed. The basis of most sealants is silicone, which is sufficiently resistant to elevated temperatures. The operating range of high-quality material can reach a thousand degrees.
• If burnouts are found on the outer surface that are difficult to seal with sealant, fiberglass is used. In this case, it is fixed to the damaged areas of the muffler using epoxy resin containing some additives.
• After fixing all the errors, the muffler is installed in place and the car is warmed up at idle speed for an hour, for better hardening of the epoxy resin.

At the same time, you can clearly see how the plugs on the VAZ 2109 engine were replaced. If there is no leakage of coolant, then the replacement of the VAZ 2109 cylinder block plug was done efficiently and in the near future no replacement of the VAZ 2109 block plug will be needed.

Repair of a burnt-out muffler VAZ 2109

Most often, the muffler burns out on the front wall, where the “gander” enters the can; the “gander” can burn out or at the junction of the muffler with the resonator. In the last two cases, repairs are carried out quickly: it is enough to weld a repair insert or a piece of pipe.

Tip: Very often it is not practical to repair the muffler. Its walls are very thin, and if it practically burns out when welding one hole, another appears nearby. Moreover, such repairs, despite the fact that the price for them is small, are only a temporary measure and it is better to replace the muffler as soon as possible.

Carrying out welding work:

• Welding is carried out semi-automatically. To apply the overlays, metal one or two millimeters thick is taken.
• The welding area is cleaned down to the thick metal that has not yet burned.
• To perform a high-quality restoration of the muffler, it is necessary to remove the mounting strip from it.
• The can and the gander are connected. It is very important to correctly align the parts relative to each other. First, you need to weld the parts, try them on the car, and only then thoroughly weld them, as shown in the photo.

• For a more reliable connection, two pads are welded to the front wall and the gander.
• To reduce rattling and breaking off of the “gander”, a small brace is installed.

Replacing the fuel filter of a VAZ 2109 car

When replacing or repairing a muffler, it is best to replace the fuel filter, which is recommended to be changed after twenty thousand kilometers traveled by the car. Filters require more frequent replacement if the car is fueled with bad gasoline. Replacement is carried out in the following sequence:

• The fuel filter is located in front of the exhaust pipe behind the fuel tank. The bolts tightening the bracket holding the filter are loosened.
• The fittings of the pipelines - outlet and inlet - are unscrewed. For this, two “19” keys are used. One is installed on the nut located on the filter housing, and the second unscrews the nut of the pipeline fitting.

It is necessary to remember the location of the fuel direction indicator before removing the filter. The filter is removed from the bracket.

When installing a new part, you need to focus on the indicators that are printed on the surface of the filter. If the installation is performed incorrectly, fuel will not flow into the pipeline. It is imperative to install the O-rings, otherwise there will be a fuel leak. The filter is installed in the reverse order. Then start the engine, inspect the joints for the presence of fuel drops. When they appear, the seals of the fittings and the tightening of the nuts are checked.

Exhaust system of VAZ 2108, 2109, 21099 cars with carburetor engine

The exhaust system of carburetor engines of VAZ 2108, 2109, 21099 cars consists of three parts: a receiving pipe, an additional muffler and a main muffler. The parts of the system are connected to each other by means of flared pipe ends and metal conical sealing rings located between them, clamped with clamps. The system elements are attached to the engine exhaust manifold with a flat flange on the exhaust pipe, through a gasket and four studs with nuts.

Elements of the exhaust system of VAZ 2108, 2109, 21099 cars

The exhaust system is suspended from the body by brackets on rubber cushion rings (5 pieces). In the front part, the exhaust pipe is additionally secured with a bracket from the engine.

The exhaust pipe of the exhaust gas exhaust system consists of two pipes attached on one side to a flange, on the other to a gas receiver consisting of two stamped metal halves. The gas receiver, on the side of the additional muffler, ends with a metal intake pipe flared at one end. The gasket between the exhaust pipe flange and the engine exhaust manifold flange is made of asbestos reinforced with perforated steel tape.

An additional muffler (resonator) consists of a housing with a perforated pipe and partitions inside. The additional muffler pipes also have flared edges for connection to the exhaust pipe and the main muffler. The outside of the optional muffler can be treated with aluminum to improve corrosion resistance.

The main muffler also consists of a housing with perforated pipes and partitions inside. The housing can be made of stainless steel to prevent corrosion. Two pipes are attached to the muffler body: on one side, flared, for connection with an additional muffler, on the other side, straight, for exhaust gases.

Both mufflers do not have welding points and are assembled by rolling parts to prevent corrosion.

Diagram of the exhaust system of a carburetor engine of VAZ 2108, 2109, 21099 cars

Notes and additions

— On VAZ 21081 cars, the muffler exhaust pipe is single, not double, since the exhaust manifold of the 21081 engine has one hole.

— The exhaust system of the injection engine of VAZ 2108, 2109, 21099 cars is discussed on our website in the article: “Exhaust system of the injection engine of VAZ 2108, 2109, 21099 cars.”

Source

How to determine whether a muffler is faulty

You can identify problems with the muffler yourself, without having any special knowledge of the automotive industry. First of all, while driving, occasionally monitor the composition of the exhaust gases. If black smoke comes out of the pipe when you press the gas pedal, then the mechanism is probably burnt and has holes.

Experienced car enthusiasts know that it is better not to bring the condition of their “glushak” to a critical level, but to identify the smallest faults in advance:

• Check if there are knocking or gurgling noises in the exhaust pipe while driving.
• Raise the car on a jack and inspect the exhaust pipe. All parts must be free of rust, burns or holes.
• Observe whether moisture drips from the muffler pipe connections. The accumulation of condensate will quickly lead to the formation of rust and corrosion of the metal.
• Assess how hot the engine gets after short trips. If the engine seriously overheats, this may be the first signal that the exhaust system is not working correctly.

If the muffler knocks

Most often, car enthusiasts complain that the device begins to knock loudly while driving. In this case, the pipe can be struck either against the body of the gas tank or against the body of the car.

The knocks can be very loud, which leads not only to a decrease in ride comfort, but also to rapid deformation of the muffler itself. In these cases, it is necessary to immediately take measures to isolate the pipe from the tank or body:

• change the hanging rubber bands (it is quite possible that during operation they have become very stretched and can no longer hold the pipe in one place);
• if the knocking starts after replacing the device, then you need to turn the mounting flange and make sure that all the gaskets are in place exactly;
• if the muffler was replaced with a “cooperative” one, homemade or from another car model, then you need to try to ensure that all fastening connections and joints exactly match the original.

If the pipe swings strongly, it is necessary to replace the rubber bands with new ones.

If none of these measures gives results, you will have to cover the impact area of ​​the muffler with a thick piece of rubber. Rubber will eliminate the sound of impacts and protect the surface of the pipe from deformation.

What to do if the muffler is broken

You can break through the device very simply - just drive at high speed on an uneven road. Even the thickened walls of the pipe cannot prevent the metal from being severely deformed, and holes may even form.

The legislation of the Russian Federation clearly indicates that operating a vehicle with a broken muffler is prohibited.

If the driver discovers that the mechanism is broken, he has only two options:

• Replace with a new one. This is the easiest way, besides, you can buy a home-made “glushak” and install it on the car yourself.
• Using a welding machine, weld a hole in the housing. This option is more expensive, since it is necessary to apply welds very carefully so as not to burn through the muffler. In addition, the driver does not always have the skills to operate the device and has to turn to specialists.

Operation of a muffler with a hole is prohibited

How to get rid of muffler knock?

Please note that if the muffler rings, growls, hums, or makes any other noise, we recommend that you do not carry out repairs yourself, but contact a professional car service center. For example, our company’s employees conduct thorough diagnostics, thoroughly examining the problem area in the pit, after which they decide on certain actions.

Possible prerequisites and methods of dealing with unpleasant extraneous noise in the muffler when venting gas or in other situations:

1. A knocking sound on the underbody may be due to an improperly lengthed or bent muffler. It is likely that the device bends against the edge of the gas tank. Another reason for this situation is the incorrectly positioned hooks by which it is suspended. A specialist will determine where the pipe needs to be bent so that the sound stops.
2. If the muffler hits something in the rear in the trunk area or the main can knocks under the rear seats, then the entire system may need to be seriously overhauled. There are two options - change the angle of the pipe or adjust the bend of the section running under the rear beam. In the second case, there is no need to remove the entire muffler; it is enough to work with the last elbow. The bend is changed by cutting with a grinder and then welding.
3. The muffler knocks on the beam - a problem that often occurs among owners of VAZ 2114, 2107, 2110, 2115, 2109, Kalina, Priora, Lada Vesta, etc. When the engine slows down, a knocking sound begins on the beam or body. Many solve this problem by tightening the clamp so that the muffler is practically pressed against the bottom, or by bending both parts of the device using a sledgehammer.
4. Sometimes, after replacing the resonator or for other reasons, the rubber fastenings become displaced, and when braking, the muffler begins to hit the gas tank with its knee. Most likely, this is due to the fact that the receiving length of the new resonator is longer than the old one. In this case, the beating occurs longitudinally, so tying it up will not help. It can be solved either by replacing the resonator with a suitable one, or by cutting out a ring from it and welding it.
5. If, after lowering the landing, rattling of the muffler appears during acceleration, it is often necessary to do the knee digestion. For low cars, the solution of installing rubber bands is not suitable; they quickly break. It makes more sense to install dropplates - a kind of metal clamps. They securely hold the beam and the entire mass of the muffler.
6. There are extraneous noises due to burnt-out partitions in the rear part of the muffler, a malfunction of the catalyst or the barrel itself.
7. A pebble may get into the muffler. It is not always easy to remove it; in some cases it is necessary to drill out one of the holes in the perforated screen, since this screen is made with a recess.

In addition, it is strongly not recommended to put an air filter on the muffler - this is often what is advised to do when there is a knock, but it can catch fire. There were many precedents. They also often ask what to put under the muffler to prevent knocking - there is no need to put anything, this is an unprofessional and temporary solution.

Ideally, you should always install original spare parts on your car - resonators, mufflers, exhaust system elements, protection. Then the risk of knocking will be minimized. After examining the car, our service staff will give competent advice on how best to get rid of the unpleasant situation - by repair or replacement. Together we will find an option that suits you in terms of quality, timing and financial costs.

What materials are they made from?

Silencers of all types can be made from:

• Of stainless steel;
• Aluminized (alloy of aluminum and steel);
• Regular black steel.

A stainless steel product can last, during active vehicle use, from 6 to 10 years, as it is least susceptible to corrosion.

They are sold on the market in a high price range, their big advantage is that despite the high price, they are mass produced and can be matched to most car brands.

Products made from aluminized steel are sold in the middle price range, they are also quite durable, but they are difficult to match to a specific car brand, since the choice on the market is not large (only a few companies produce them).

It is problematic to make such a muffler in a garage. The main advantage is a long service life of up to 6 years, and are less susceptible to corrosion.

Products made of black steel are mass produced because they are the cheapest. They can be made in a garage for any brand of car, but they will serve for 3, maximum 5 years, then the aggressive environment and rust will do their dirty work.

Exhaust system of carburetor VAZ 21099

In addition to the exhaust manifold installed on the cylinder head, it consists of three main elements (see figure below):

To attach parts to the body, there are hooks on the muffler and resonator, by which these parts are suspended from the bottom through rubber pads 5.

To ensure that the receiving pipe flange does not experience overloads when oscillating in motion, there is a receiving pipe bracket 1 attached to the block.

Between the flange and the manifold there is a sealing metal-asbestos gasket 2; connections of pipes whose ends are flared are made using special clamps 4 with metal rings:

Sound absorption technologies

The exhaust system, and in particular the muffler, can use one or several sound absorption technologies:

• change in gas flow cross section;
• changing the direction of gas movement;
• surface absorption of sound waves.

Depending on which frequencies predominate in the engine exhaust sound spectrum, this sound reduction method is used. For example, to suppress low frequencies, it is effective to use several resonator chambers with different volumes. The use of different sections of input and output pipes combats high frequencies well. But in principle, a muffler, like a good musical instrument, is customized exclusively for a specific brand of engine. Then the noise reduction efficiency is much higher and there is less power loss.

The design of the exhaust system in the VAZ 21099

If a car engine is given the opportunity to “breathe” freely, i.e. create conditions for the unhindered release of exhaust gases, then, without a doubt, its efficiency and power will increase. But in this case, life in cities would become unbearable, and drivers would have to put in earplugs.

Exhaust systems are constantly being improved, they are assigned additional functions related to reducing toxicity and optimizing the fuel mixture. The VAZ 21099 is no exception - some, especially re-exported, cars of this model were already equipped with catalytic converters and λ-probes in the early 2000s. Why these innovations are needed - a little later, let's start the description with the design of the exhaust system on the carburetor VAZ 21099.

Repair methods

Often traveling along our “magnificent” roads, you now and then run over all kinds of bumps, potholes, and holes. If, after passing another similar obstacle, the car begins to make noticeable noise, which was not the case before, then the most likely outcome is a hole in the main muffler. The presence of a hole does not allow you to work calmly, quietly and efficiently as before.

The law of the Russian Federation states that it is prohibited to operate a car with a broken muffler. Therefore, the only correct solution would be to repair the unit.

There are two ways to repair the main muffler:

• Replace with a new one. Practical, easy and fast. You can do this kind of work with your own hands without any problems.
• Fill the hole. This option is suitable only if the hole can be welded given its size, and you also have experience in welding. It is better to entrust welding to professionals.

Replacing the main muffler

To remove the muffler, follow fairly simple step-by-step instructions.

• Arm yourself with a 13mm deep socket socket, a 13mm spanner and a ratchet.
• Drive the car into the inspection hole, or lift it using a lift. Although you are unlikely to have a lift in your garage. But almost all garages in auto cooperatives are equipped with pits.
• Wait until the entire exhaust system has cooled completely, otherwise burns will occur.
• Disconnect the main muffler from the resonator, that is, the additional muffler. To do this, find a tie rod. The fastening nut is grabbed with a spanner to avoid turning. At the same time, the bolt is unscrewed using a ratchet.
• After unscrewing the bolt, remove the fasteners, disconnect the exhaust system elements, remove the clamp and free the main muffler from the resonator.
• Carefully remove the front part of the silencer from the rubberized suspension.
• Remove it from the rear suspensions and pull the damaged element out.
• Then act according to the circumstances. As we noted, a broken muffler can be welded, or a new one can be installed in its place.
• Reassembly is carried out according to the instructions provided, only in the opposite sequence.

When choosing a new main muffler, focus on the characteristics of the factory product. If you want to modify the rear of the car, simply install a decorative nozzle on a regular pipe. You should invent something with the modernization of the aircraft only if work is being carried out on the technical modification of the car - tuning.

Replacing the resonator

To change the additional muffler, follow the instructions provided:

• By analogy with the previous stage, disconnect the main and additional mufflers;
• Disconnect the element from the catalyst. Here you have to use a spanner wrench to unscrew a pair of mounting bolts;
• Lift the unit a little and disconnect it from the rubber hangers;
• In some cases, this cannot be done manually. In such a situation, use a flathead screwdriver to pry out the hangers;
• The dismantling process is even easier than in the case of the main muffler;
• Installing a new element is performed in the reverse order.

How to replace?

Based on the above, we can conclude that the best muffler repair is to replace it. This statement is also relevant for other parts of the VAZ-2109 exhaust system. The muffler is replaced with an inspection hole, a 13mm spanner and a socket of the same size. All actions are performed step by step:

• The car is driven into the inspection hole and put into gear.
• The main muffler is disconnected from the resonator. To do this you need to find a clamp. Use a spanner to tighten the fastening nut (to prevent twisting). At this time, the bolt is unscrewed with a ratchet.
• Afterwards, the fasteners are removed and the elements of the exhaust system are disconnected. The clamp is reusable, so we will put it back.
• Carefully remove the front part of the muffler from the rubber “cushion”, through which the part is attached to the body. Then the same operation is done with the front “pillows”.
• If the muffler is stuck to the resonator pipe, it can be rotated counterclockwise and back. This makes it easier to remove the muffler.
• The new element is installed in the reverse order.

Please note that rubber pads may be torn. It's better to buy a spare set. On the “nines” they are very flimsy. It is advisable to install pillows made of durable material (for example, polyurethane). This will not affect comfort (there will be no more vibrations), but the resource is at least twice as long.

Read also: Repair of valve guides

Changing the resonator

To do this, we need a basic set of tools (open-end wrenches and heads), as well as an inspection hole. You can start repairing the VAZ-2109 exhaust system only after making sure that it has cooled down. So, we need to disconnect the resonator from the muffler on one side and the catalyst on the other. You need a socket wrench to unscrew a couple of bolts. Then we lift the resonator and disconnect it from the rubber pads. If the resonator does not budge, you need to use a flat-head screwdriver. With this we can carefully pry off the rubber suspension element. Then everything is simple - we take the part out and put a new one in its place. Assembly is carried out in reverse order.

About repairs

Some owners resort to muffler repair. But it must be said that such measures, if not useless, are at least temporary. The fact is that gases can break through not only outside the muffler, but also inside. That is, after installing the patch, the exhaust sound will not change. The cost of a new muffler for a “nine” is now about a thousand rubles. And it will last much longer than the old repaired one.

Tuning

Those who want to change the exhaust sound to a sportier one can install a straight-through Stinger muffler. The exhaust system of the VAZ-2109 is also modified by installing a “Stinger” brand spider.

As a result, gases will freely leave the combustion chamber. But you need to understand that the exhaust sound will increase several times. Since there are no such labyrinths in a direct-flow muffler, all gases go directly into the atmosphere.

The car will sound sporty, but there is no need to talk about a significant increase in power. A more correct solution is to install such a muffler after upgrading the engine. You can start by installing a 16-valve head, then change the intake system, mount a turbine, and so on. There is no point in installing direct flow on a simple VAZ engine. The standard exhaust system already copes with the exhaust from a simple atmospheric engine. In the case of installing a turbine on a “nine”, such modification is simply necessary.

Device

In total, this system includes several elements. This:

• An exhaust manifold. This is the very first part through which gases pass after combustion. People call the collector a spider for its characteristic shape. This element is supplied to each of the four cylinders of the internal combustion engine. Then all these pipes are combined into two, and then into one single pipe. There are also sports manifolds with a 4-2-1 exhaust pattern. They are installed to increase power. As practice shows, gases move more freely along the path, but the driver still will not feel a significant increase in power.
• Reception pipe. It connects to the collector. There is a special probe inside this pipe. This is an oxygen sensor, or lambda probe. If we talk about the VAZ-2109 exhaust system (carburetor), there is no such sensor in the system. But on car injectors, a lambda probe is required. The slightest problems with it may be accompanied by a “Check Engine” lamp on the instrument panel. In fact, the exhaust pipe has the simplest device. There are no sound-reflecting partitions or special fillers. This is an ordinary hollow pipe in which a single sensor can be located.
• Catalyst. As in the previous case, this element is present only on injection versions. There is no catalyst on carburetor engines. What is this element needed for? Its main task is to reduce the concentration of harmful substances in exhaust gases. Passing through the catalyst honeycomb, harmful metals are converted into harmless oxides. Thanks to the use of this element, the machine began to comply with the environmental standard Euro-2 and higher. The catalyst is the most expensive element in the VAZ-2109 exhaust system (injector). Therefore, when it malfunctions, many install flame arresters or simply knock out the core and weld the walls, leaving the catalyst empty inside.
• Resonator. This element is present on both carburetor and injection versions. A resonator is installed behind the catalyst. What is his task? The resonator serves to absorb the main noise from the exhaust gases. Thanks to this element, the sound of gases becomes less. The resonator is designed simply. This is a metal case with a perforated pipe inside. Additionally, there may be a partition inside.
• Main muffler. The resonator can be called an auxiliary muffler, but the main sound energy is absorbed by the last muffler, located under the rear bumper. It enters the resonator and absorbs up to 90 percent of the sound. The structure of this element is somewhat more complicated. The basis here is also taken from perforated tubes, but there are several of them, as well as chambers. Usually these are three or four tubes and two chambers. Passing through this entire labyrinth, the gases lose their energy and exit without unnecessary sound.

Read also: Types of traffic signs

The main reasons for loss of performance

Despite many nuances, the structure of the exhaust system of the car in question is of a high level of quality. Since the design is quite simple, there is practically nothing to break there, except perhaps a violation of the structure of the muffler. Most often, a decrease in the performance of the muffler occurs as a result of the appearance of holes. A broken muffler is common on roads with poor quality surfaces.