Shooting at the silencer
Content
Shoot the muffler can on machines with both carburetor and injection ICE. At the same time, oddly enough, the muffler itself has nothing to do with it. It is only a source of sound, and the reasons for the appearance of loud sounds lie in completely different parts of the car.
Most often, the causes of pops in the muffler are breakdown of the ignition system, fuel supply or gas distribution system. Next, we will figure out how to get rid of the problem when shoots the exhaust pipe, and what first of all you need to pay attention to when “explosions”.
Why shoots a muffler
the basic reason that the internal combustion engine fires at the silencer is unburned fuel, which got into the exhaust system and ignited in it. The more gasoline leaked out, the louder the pop will be, and in some cases there may even be a whole series of “shots”. In turn, fuel can enter the exhaust system for various reasons. These can be breakdowns of the carburetor, timing, ignition system, various sensors (on injection machines) and so on.
The situation when it shoots into the exhaust pipe can occur under different circumstances. For example, when regassing, at idle speed of the internal combustion engine or when releasing gas. usually, when popping, it is released from the exhaust pipe a lot of smoke. This breakdown is also accompanied by additional symptoms - loss of ICE power, floating idle, increased fuel consumption. We will analyze in order the reasons for which it shoots at the silencer, as well as methods for eliminating the breakdown.
Clogged air filter
Air filters
One of the reasons why there are muffler claps, is an incorrectly formed fuel mixture. To create it, you need gasoline and a certain amount of air. It enters the internal combustion engine through a system that contains an air filter at the inlet. If it is clogged, it does not allow enough air to pass through itself, so a kind of “oxygen starvation” of the internal combustion engine is obtained. As a result, gasoline does not burn completely, and some of it flows into the collector and then enters the exhaust system. There, the fuel heats up and explodes. Because of this, a kind of cotton is obtained in the muffler.
Eliminating the cause of this phenomenon is easy. need check the condition of the air filter and replace it if necessary. This is especially true if you have not changed the filter for a long time, and according to the regulations, such a procedure already needs to be performed. This is the simplest problem, why shoots at the silencer. We move on.
Not tuned carburetor
car carburetor
Often the reason that the internal combustion engine fires at the muffler is an incorrectly tuned carburetor. Its task is to create a fuel-air mixture, which is then fed into the internal combustion engine. If it is set so that the mixture is supersaturated with gasoline, a situation similar to that described above is created. The way out here is to check and adjust the “carb”.
The first thing you need check fuel level in the chamber where the float is also spread out. any carburetor is configured individually and has its own level. However, if its cover is removed, then the float should be flush with the level of the cover. If not, adjust the level. also necessarily check the integrity of the float. If it is damaged, then fuel can get into it, which leads to the fact that it incorrectly shows the level.
The reason that the carburetor shoots into the muffler may be the jets. They are either incorrectly configured or clogged over time. If the air jet does not supply enough air, then there is a supersaturation of the mixture with gasoline with the result described above. Often such a breakdown manifests itself when the internal combustion engine switches from idle to increased, or with a sharp increase in speed (acceleration). you need to check the condition of the jets and, if necessary, clean them.
| Air/fuel ratio | Description | Comment |
|---|---|---|
| 6 / 1 - 7 / 1 | Extremely rich blend. Ignition interruptions. | Rich mix. Long burning, low temperature. |
| 7 / 1 - 12 / 1 | Re-enriched mixture. | |
| 12 / 1 - 13 / 1 | Rich mix. Maximum power. | |
| 13 / 1 - 14,7 / 1 | Poorly rich mixture. | Normal mix. |
| 14,7/1 | Chemically perfect ratio. | |
| 14,7 / 1 - 16 / 1 | Weak lean mixture. | |
| 16 / 1 - 18 / 1 | Poor mixture. Maximum efficiency. | Poor mixture. Fast combustion, high temperature. |
| 18 / 1 - 20 / 1 | Over-poor mixture. | |
| 20 / 1 - 22 / 1 | Extremely lean mixture. Ignition interruptions. |
Defective ignition system
Also, one reason that the fuel does not burn completely and pops from the exhaust pipe is heard may be an incorrectly set ignition. namely, if ignition is late, then pops in the muffler at idle and high speeds are inevitable. This fact is very easy to explain. A situation occurs when a spark appears at a moment when the supply valve has already fully opened, as a result of which part of the fuel does not have time to burn out, but seeps into the manifold. BUT if the ignition is "early"then “shoot” will be at the air filter.
Checking the spark plugs
also, a weak spark can be the cause of incomplete combustion of the fuel. In turn, this is a consequence of one of the facts:
- Bad contacts on high voltage wires. they need to be reviewed and cleaned if necessary. you should also check the absence of penetration to the "mass".
- breakdowns in the work of the distributor... It is also advisable to check its work.
- Partially out of order spark plug. If at least one of them has exhausted its resource, this affects the power of the spark it gives out. Because of this, not all fuel burns out either. Check and replace spark plugs if necessary.
Incorrect thermal gap
Thermal gap - this is the distance by which the individual parts of the internal combustion engine increase in volume when heated. namely, it is between the valve lifters and the camshaft lobes. an incorrectly set thermal gap is one of the possible reasons that it shoots at the silencer.
Indirect evidence of an increase in the thermal gap may be increased noise during the operation of the internal combustion engine, as well as a decrease in its power. If the gap is reduced, this can lead to the fact that the gases will shoot into the exhaust pipe. This is due to the fact that a valve that is not completely closed allows gasoline to pass into the manifold, from where it then enters the exhaust system.
The thermal clearance of the cylinder head valves can be adjusted. Therefore, in order to eliminate this problem, it is enough to adjust the valves. This procedure is always carried out on a cold engine.
Faulty timing
breakdowns in the operation of the gas distribution mechanism are generally similar to ignition problems. namely, the exhaust valve opens at the moment when the gasoline has also not burned out. Accordingly, it enters the exhaust system, leading to the already familiar pops in the muffler.
Gas distribution mechanism
There are several reasons for malfunctions in the timing system:
- Timing belt wear. A sign of this breakdown is the appearance of additional metallic pops or noises when the internal combustion engine is running at low speeds. In this case, you need to revise the belt and, if necessary, tighten or replace it. You can read how to do this in the corresponding material.
- Toothed pulley wear. In this case, you need to replace it.
- Partial valve failure. Over time, they become covered with soot (especially when refueling a car with low-quality gasoline), which leads to a deterioration in the operation of the mechanism. And due to the hanging of the valve springs, the internal combustion engine overheats. Therefore, it is worth checking the valves. If you find small roughness or bends on their surface, then in this case, grinding them is a mandatory procedure. If the scratches are significant, they need to be polished or the valves replaced.
Usually, with a faulty timing, pops in the muffler are heard when the internal combustion engine is warmed up. If the internal combustion engine is “cold”, then they are not. This is also one indirect evidence of the timing's guilt. However, for an accurate clarification, additional diagnostics are needed.
Problems with injected cars
According to statistics, the problem of shots in the muffler is more often faced by owners of carburetor cars. However, it can also occur with an injection car. However, the reasons for clapping are different.
In such machines, the ECU controls the operation of the internal combustion engine based on information from numerous sensors. And if any of them gives false information, this leads to incorrect motor control. For example, if the air intake sensor is faulty, this will lead to incorrect formation of the fuel mixture. You should also check the crankshaft position sensor. If it gives out information about the care for one tooth, then this will also lead to incorrect operation of the system. The throttle position sensor, Hall sensor and other elements may “fail”.
The very first action you should take is perform computer diagnostics your car. It will show which sensor or ICE element has problems. When it shoots at the silencer, it is also advisable to check the injector using computer diagnostics.
Additional reasons
There are also a number of reasons why the exhaust pipe shoots. These include:
- Claps at idle engine speed are possible for two reasons - a violation of the tightness of the intake manifold, as well as a clogged idle system.
- Low quality gasoline or low octane gasoline. Try to refuel at trusted gas stations and use fuel recommended by your vehicle manufacturer.
- Swapped spark plug wires. If, when replacing or checking candles, you mixed up the wires connected to them, this will also be a likely cause of pops. In this case, the car may not start and “shoot” into the muffler.
- If your car has economizer - check his work. Often the breakdown of this node is also the cause of "shots".
- breakdowns at work air damper. Check this item and adjust if necessary.
- One of the reasons when he shoots the silencer when releasing gas, lies in the fact that the exhaust pipe of the muffler ("pants") is not properly bolted to the exhaust manifold. Check the tightness of the connection, seal it if necessary.
- also one likely cause of pops is high performance fuel injectors (“flow”). They supply too much fuel, which does not have time to completely burn out, which leads to the appearance of "shots". There is an easy way to check. you need to try to start at high engine speeds (with the gas pedal depressed) (the so-called purge mode). If pops appear at this time, it means that at least one nozzle is leaking.
- In injection machines, late ignition and, as a result, pops, can be caused by “fatigue” knock sensor. It can also respond to extraneous noise that occurs in the internal combustion engine. The operation of the sensor must be checked using computer diagnostics.
- If when you release the gas, it shoots at the silencer, then one of the most common reasons for this is the “burning” of the exhaust valves. pops can also appear when descending a mountain in gear. Check them out and clean them up.
- If your car uses a contact ignition system, then you need to check gap on its contacts. Ignition problems, as described above, may be the reason that not all gasoline is burned.
- Leakage of the gas exhaust system. In this case, single pops usually appear when the gas is released. First of all, check the gaskets at the junctions of the pipes (catalyst, resonator, muffler).
Also, when shooting occurs and traction deteriorates, it is recommended to check the fuel pressure in the system, as well as compression (leak tightness of the cylinders), and revise the ignition coil.
muffler condensate
The main reason for the formation of condensation in the muffler is the temperature difference between the ambient air and the muffler. Its formation in a car with a working catalyst is a natural phenomenon. It’s worse if it’s not there, but too much can cause corrosion. There is a Read more
As you can see, there are many reasons why a silencer shoots. Therefore, we advise you to start diagnosing with leak test exhaust systems. Make an audit of the bolted connections and gaskets between its individual elements. This will save you time and money. This is especially true if the pops are distributed when releasing gas or when descending a mountain in gear (when braking the engine).
If the revision did not give positive results, then you need to check the operation of the carburetor, valves and other parts described above. This check is useful if it fires at the silencer. when you press on the gas.
Claps at cars with LPG
Unfortunately, this problem has not bypassed the car that uses liquefied gas as fuel. According to statistics, most often it is faced by owners of cars with fuel-injected internal combustion engines and third-generation HBO.
Pops on gas can be distributed both in the intake manifold and in the exhaust system (namely, in the muffler). There are two main reasons for this:
- No stable and sufficient gas supply. This is due to incorrect setting of the gas reducer or clogging of the air filter. In injection cars, the mass air flow sensor (MAF) may be the culprit. “Glitches” in his work lead to incorrect operation of electronics. That is, we get a depleted or enriched gas mixture, as a result of which pops appear.
- Incorrect ignition angle. In this case, the situation is similar to that described above. If the ignition is late, the muffler “slams”, if it is early, the intake manifold or filter.
Monitor the status of your HBO and its settings. Do not neglect the occurrence of problems. Otherwise, you can not only face costly repairs, but also spontaneous combustion of the car's power unit.
Hack and predictor Aviator
Popping from the exhaust pipe - signs uncritically, but quite an unpleasant "ailment". In addition to external manifestations, the internal combustion engine and the exhaust system deteriorate, as well as excessive fuel consumption, which leads to unnecessary waste of money for the car owner. also, if the problem is ignored for a long time, the valve, exhaust pipe, resonator or muffler may burn out. In general, with such a breakdown machine can be usedhowever, it is recommended that repairs be carried out as soon as possible. If you cannot or do not want to do them yourself, contact the service station for help.
