If the engine is unstable, then this phenomenon is called "missing" abroad. For our ear, the word is overseas and not understandable for everyone. Experienced minders know what it is. Missing - misfiring of a combustible mixture in one of the cylinders. More often, drivers in this case say that the engine is troit. In this article, we will find out what are the causes of the occurrence and what ways of eliminating the defect are possible.
The engine trotting is accompanied by "coiling". The sound is quite distinguishable and recognizable. It is he who signals a non-working cylinder. The engine temperature rises rapidly. ... The power unit is subject to rapid wear. Therefore, it is important to determine why the engine is troit and eliminate the malfunction as soon as possible.
Spark plug
They are the most common reason. Even if the candles were changed not so long ago, still unscrew and inspect.
A properly functioning plug has no black deposits on the electrodes and insulator. The body of the candle is white, without black stripes and dots. The presence of defects indicates that the spark plug is pierced by the discharge and it will no longer work correctly. Carbon deposits interfere with the normal formation of a spark and the engine is triple.
Carbon deposits on spark plug electrodes are the main cause of the triple formation of an internal combustion engine.
The second reason is incorrectly selected candles. Buy the ones recommended by the car manufacturer. Too large or small clearance will result in failure of one or more cylinders.
High voltage wires
Checking high-voltage wires is mandatory when diagnosing an engine when it is troit. There should be no traces of breakdown on them. The spark plug tips must be clean and free of carbon deposits.
After visually inspecting the spark plugs, check the high voltage wires. There should be no traces of breakdown on them: black dots and stripes. Due to the breakdown, the current does not reach the candles. This defect is the next reason for the triple formation of an internal combustion engine.
Self-checking the wires will not cause difficulties. They are tested with an ordinary multimeter. It is necessary to measure the resistance of each wire.
Video of checking BB wires
Check the wires with a multimeter. Measure the resistance of each wire. It differs for different car brands, but does not exceed 20 kΩ. Serviceable wires have the same resistance. If one of them shows much less or more, then it is faulty and because of it the power unit is troit.
Ignition module
The ignition module is often the third reason for triplet powertrain. You can check it, but with special equipment and with experience. Do not test the module yourself.
Ignition module check video
The engine triples only on cold
There are times when the engine runs cold. If you are convinced that the plugs and wires are in order, then check the ignition module. Without skills and sufficient experience, such diagnostics should not be carried out with your own hands.
You can get an electric shock or burn the module, engine control unit.
If you suspect that the engine triplet occurs due to a malfunction of the ignition module, then contact specialists.
Faulty injector or nozzles
The injection engine troit in such cases:
- The injector is faulty, but this is very rare.
- Poor gasoline or fuel system cleaner used incorrectly.
- Clogged nozzles.
- The injector power supply circuit is open or shorted.
Engine diagnostics and a competent minder will help to eliminate such malfunctions. For self-checking the injector and injectors you need experience and special equipment.
Low compression
Troit the engine due to insufficient compression in the engine cylinders. Reduction occurs: when the rings are on the pistons, the valves are burnt out. Some car models allow valve adjustment. Incorrectly set clearances are the cause of the triple structure of the injection engine.
Finally
If you have a triple engine, one or more cylinders do not work, do not rush to go to computer diagnostics. Checking with a scanner will fix a misfire, but will not indicate the cause. The cylinder does not work - this is so obvious. Check the spark plugs and wires before going to the car service. They are most often to blame for the engine troit.
Missing. All drivers know this problem, only in folk-mechanical slang it is called a little differently.
One cylinder does not work, what should I do?
"Troit the engine" - this is what a malfunction is called when it does not work in the engine. There are times when two cylinders do not work at once. But, this happens very rarely. Therefore, let us consider in detail the situation when one cylinder does not work.
Moreover, the causes of the malfunction, their search and elimination, are equally related to the situation when two cylinders do not work.
By what signs do you know that one cylinder of the engine is not working? It's simple. For body vibration, interruptions in the duty cycle, and a strange sound other than smooth engine operation. You will understand. If the engine is troit, it cannot be overlooked by the behavior of the car.
A driver who is not very familiar with the device and the principle himself, the question arises - is it possible to move (moreover, to drive for a long time if one cylinder does not work).
In principle, yes, you can. But, it will not last long. The engine will fail or you will "run over" problems with the engine, the number of which will force you to fork out not for a tidy, but for a huge round figure.
Before analyzing the reasons why one / two cylinders may not work, we will briefly consider the consequences of neglecting this malfunction.
What does movement with an inoperative engine cylinder lead to?
Fuel entering an idle cylinder does not burn. It is mixed with oil. It washes it off the cylinder bore and enters the crankcase. Not only is the dry surface of the cylinder subject to mechanical damage, the so-called. seizures, and oil diluted with gasoline does not fulfill its functions for lubricating the rest of the working cylinders.
This, accordingly, also leads to the failure of the remaining cylinders. That is, and maybe you are 100% provided.
Another unpleasant news if one cylinder does not work is the possibility of engine overheating with all the ensuing consequences. The engine begins to change the temperature regime. It heats up, because the oil has lost its quality, and in addition to lubrication, it also performs the function of a heat sink.
There are probably enough consequences to think about whether it is possible to continue driving if one cylinder does not work.
Where to look for the cause of a non-working cylinder
The remark is that checking and searching for the cause is carried out in a garage. There are two options: mechanics and electrical (ignition). You need to start along the easy path, namely, with ignition diagnostics.
- Spark plug. We determine their performance in the old fashioned way. Visually, the side electrode and insulator should be light brown, but not black with carbon flakes. A smoked electrode indicates either that the mixture is too rich, or that it is splashed with oil. Sparking. By inserting a candle into the explosive wire, we bring it to a distance of 1-2 cm to the cylinder block and scroll with a starter. If the spark “slips” this distance, then the candle is in order, if not, then we change it.
- High voltage wires. We check them for mechanical damage. Checking their tips. If there is a light gray coating on the tip of the BB wire, this indicates its operation in extreme mode. The resistance of the explosive wires is checked with a multimeter. Different engines have different lengths of explosive wires and different resistance. If not stated otherwise, then 20 Kom is considered to be a constant resistance value. If the resistance is higher, you need to look for the cause in the BB wire.
- Distributor. If the spark plug is faulty, then we will see a "breakdown" in the ignition distributor cover. Be sure to check the "coal", you can slightly stretch the spring.
- BB wires are corny mixed. And it is precisely because of this that one or two cylinders do not work.
- Injector. It is possible that one cylinder is not working due to problems with the injector. This is either a malfunction of the injector itself, or the injector is clogged with low-quality fuel, or rather the fact that there is a lot in it. By the way, be careful and discerning when using the "super miracle" fuel cleaners that are sold on every corner. Ideally, diagnostics and cleaning of injectors should be carried out at the stand.
- Timing Fuel - The air mixture enters the cylinders in the wrong quantity and quality. There are a lot of reasons here. The belt is incorrectly installed, the development of the tensioners, the oil seal. Camshaft wear, hydraulic lifters wear. Burned out, as a rule, due to engine overheating (take a good look at yourself when you want to ask why it overheated) during a sporty driving style, or a decrease in the coolant level.
These are the traditional reasons why one cylinder of the engine does not work. And this is not a complete list. In any case, finding the cause will lead you to the desired result, and you will eliminate this malfunction. Independently or using the service.
Good luck in determining the cause and troubleshooting the inoperative cylinder.
If the engine "troit" and one of the cylinders does not work, then we will hear a clearly distinguishable "boo-boo-boo" - the engine does not sound as usual. Let's figure out the main reasons and how to fix the situation with our own hands.
What consequences
When the motor "troit" and shakes, it starts to wear out quickly. Because of this, compression decreases, conditions are created for creating scoring on the cylinders and pistons. The motor starts to work in a different temperature mode, starts to overheat. Sometimes it turns out that everything is checked, but the engine still "troit".Therefore, we will try to disassemble the procedure for diagnosing in normal conditions, when there are no special devices to look inside and pinpoint the cause.
Spark plugs are to blame
To begin with, we will unscrew the candle from the cylinder and examine it carefully. What will we see? If the engine is running properly, the side electrode and insulator will be light and slightly brown in color. Such a candle should work. If we see black carbon deposits, this is the reason why the engine may run unevenly. Fuel enrichment or oil filling in progress.Carbon deposits reasons:
- long idle and warm-up operation;
- reduced compression in the motor;
- violation of the valve timing;
- improper operation of the injector (nozzles are clogged with dirt);
- improper operation of the oxygen sensor.
If the visual inspection is satisfied, then check the spark when cranking with the starter. We insert the candle into the tip of the high-voltage wire, put it on the engine ground and turn the engine with the starter, see if the spark jumps between the spark plug electrodes or not. If a good spark of a deep blue color jumps between the candle and the mass, everything is fine.
If the spark does not skip or skips, but is barely noticeable, this is the main reason why the engine began to triple. Verdict - replacement of candles with new ones.
Inspection of high voltage wires
If everything is in order with the candles, then we will carefully consider each high-voltage wire separately. Some cars have individual ignition coils, which means we skip this point. First, inspect the tip of the wire inserted into the candle. It should be of a solid color and free from plaque on the inner surface and dots on the outside.If there are these reasons, then the high-voltage wire worked in an extreme mode (faulty car plug, increased gap), which was a malfunction. The result is the replacement of wires with new ones. If you don't pay attention to the color change inside the tip of the high-voltage wire in time, then the wire will break through.
To determine the state of the "high voltage" we measure the resistance using a digital multimeter. Values \u200b\u200bvary on a specific motor, but should not exceed 20 kΩ. If one of the wires showed a resistance value much less than all the others, then it is faulty and the reason for the interruptions in operation lies in it.
It happens that high-voltage wires are confused. This happens because the ignition coils have numbers indicating the cylinder number for which it works. But not everyone knows this or they are poorly readable due to dirt. On cars, the cylinder numbers are written on the ignition distributor, you just need to clean the cover from dirt and it will immediately become visible.
Malfunction of injectors and injector
The motor can be tripled due to the injector or malfunction of the injectors in the following cases:- Faults in the injector itself (rare);
- Due to the use of low-quality fuel, the use of "fuel system cleaners";
- The power or control circuits to the injector are open or short.
Other reasons
One of the reasons why the engine "troit" is a poor connection of "mass" with the car body. There was a case when the mounting of the mass moved away from the vibrations and the motor worked intermittently, because there was no reliable contact. After pulling the connections, the engine started up normally. There may be a floating bug when the mass lashing comes off on bad roads. It turns out that they started the car, and a lot left on the road. When all the methods have been tried - and it does not hurt to check it.Video - what is worth checking out?
If one of the sensors does not work, an error will appear that can be considered an auto scanner. If it is not there, then the reason is in the mechanical part. If it was not possible to find a malfunction, you should use computer diagnostics. As a rule, many cases of inadequate motor operation can only be detected by a special device. Otherwise, you will throw away "extra" money to replace serviceable parts.
Chery Fora 2.0 / Chery Fora (A21), 4dv sedan, 128 hp, 5MKPP, 2006 - 2010 - Troit engine
Chery Fora 2.0 (A21) 4dv. sedan, 128 HP, 5MKPP, 2006 - 2010 - engine troit
The main reasons for triplet
Incorrect ignition timing.
- Air leaks in the brake vacuum booster system.
- Faulty spark plugs. It is worth noting that this problem is the most common, since the spark plugs need to be changed after the car passes every 20,000 kilometers (this figure depends on the recommendations given by the designers to each car).
- Breakdown of the high-voltage wire that fits the spark plug.
- Faulty installed capacitor.
- Violation of the tightness of the system in the area of \u200b\u200bthe intake manifold.
- The appearance of burnout of one of the piston, valve.
- Piston ring breakage, deformation and wear also lead to this problem.
- Incorrect adjustment of the valve timing.
- High degree of wear on the rocker.
- Breakdown of the installed cylinder head gasket.
- Any kind of wear (hardening, breakdown, destruction) of the valve stem seals.
- If the carburetor is incorrectly adjusted, cylinder malfunction can also occur.
- Condition of the installed distributor shaft, pivot plate bearing.
- Clogged air filter.
- Loss of tightness of the membrane of the vacuum ignition timing regulator.
- Use of unsuitable spark plugs (not only dimensions are taken into account, but also other parameters of this element) for this engine.
Engine troit
Engine troop is a definition by which it should be understood a failure in the operation of the internal combustion engine, when one or more cylinders do not work partially or completely. In other words, the combustion process of the fuel-air mixture in individual cylinders is disrupted, which causes unstable operation of the engine at idle, under load and in transient modes.
The structure of the engine manifests itself in the form of increased vibrations of the power unit, the engine noticeably loses power. Ignition misfires can be observed, which are accompanied by strong popping in the exhaust system. The motor can run both occasionally and constantly, only at idle or under load, on cold, on hot, etc. Next, we intend to answer the question of what is engine triplet, and also consider the main reasons why the motor begins to triple.
Why does the motor start to triple
The engine trot is a violation of the combustion of the mixture in the cylinders, which is accompanied by a clear increase in vibration. Please note that the appearance of vibrations of the internal combustion engine is not necessarily a triple, since there are a number of other reasons why the engine vibrates strongly.
In the list of major faults, as a result of which the engine troit, the following are noted:
Insufficient or excess fuel supply to the cylinder;
insufficient or excess air supply;
malfunctions of the ignition system, early or late ignition;
engine wear or breakdown, which is accompanied by a decrease in compression;
In other words, the engine begins to triple as a result of an inappropriate composition of the fuel-air mixture, untimely ignition of the mixture or the inability to ignite the charge, as well as violations of the conditions for normal combustion of the mixture as a result of mechanical wear or breakdowns of the engine itself.
Based on these data, it is possible to narrow down the search and the number of systems for diagnostics. The test should start with the fuel system and injector, then the intake air supply and ignition system are checked. In some cases, engine tripping may also be the result of a failure of one of the ECM sensors.
The engine is troit: the ignition of the fuel-air mixture is broken
The most common cause that causes the engine to triple is late or early ignition, as well as a weak spark from the spark plug. At the initial stage, the spark plugs should be unscrewed for a detailed inspection. If damage to the insulator or other defects is noticeable, then the spark plug should be replaced.
In the case of a damaged insulator, the place of damage is clearly visible, since this area turns black. You should also pay attention to the condition of the center electrode and evaluate the clearance of the side electrode.
Next, you need to check the spark plug wires. An indirect sign indicating this element is the occasional triplet of the motor in conditions of high humidity (rain, dampness, etc.). Once the engine warms up and reaches operating temperature, symptoms may completely disappear.
You should start by inspecting the candle cap and the high-voltage wire itself. These elements have rubber insulation, which tends to dry out and crack over time, as a result of which the wire begins to break through.
Also, the high-voltage wire or cap is often damaged during service or repair work in the engine compartment. We add that the place of the breakdown can be visually undetectable. In this case, it is better to check this element of the ignition system using one of the available methods.
If everything is in order with the candles and wires, then the ignition coil may be the culprit for the engine troit. On motors with separate coils for each candle, this phenomenon is especially common. To check the ignition coil, you need to unscrew the spark plug, attach it to the ground and start the engine. Please note that the thread of the candle should touch the mass tightly, the cap should be tightly put on the candle. Failure to follow these guidelines can result in burnout of the coil or switch. A good spark with a characteristic crackle will indicate that the coil is in good working order, the absence of a spark will indicate the need to replace the coil.
As for the electronic ignition distributor (switch), this element does not break often. To check, the candles are securely attached to ground, then the caps are connected to them, after which one person turns the motor with a starter, and the other assesses the strength of the spark on the candles.
Motor structure: air supply problems
Insufficient or excessive intake air can also cause cylinder tripping. The air supply system can lose its tightness and the engine begins to suck in excess air. The ECU does not take into account this leakage, as a result, the stability of operation is disturbed.
Checking the air system is straightforward. It is necessary to tightly close the inlet pipe next to the air filter, then pump air to create a pressure of about ½ atmosphere, and then look for the leak. If the pressure does not drop, then the system is sealed. The appearance of a hissing sound of outgoing air allows you to determine the problem area through which the motor sucks in excess.
Air shortages are often caused by a dirty air filter that has lost its capacity. The filter must be removed and the engine performance evaluated after removal. Also, there may be insufficient air in the event that the throttle valve is clogged or there is a problem with this unit. The specified element requires mandatory cleaning and inspection. It is advisable to do this at each scheduled maintenance in parallel with the replacement of engine oil, filters, etc.
Another reason for the triplet engine may be the DPDZ, DMRV or another sensor that gives the wrong signal to the ECU. In such a situation, the control unit does not know to what degree the damper is actually open, how much air actually entered the engine, etc. On the basis of incorrect data, the "brains" cannot accurately calculate the optimal composition of the fuel-air mixture in relation to the dynamically changing operating modes of the internal combustion engine.
In this case, you should view the readings of the sensors and read the errors with a scanner that is connected to the diagnostic connector of the car. Then the values \u200b\u200bmust be compared with the nominal ones. Abnormalities in the readings of the air flow meter or throttle position sensor lead to the fact that the engine begins to triple.
Driving over cylinders: power system faulty
When checking the power system, you should pay attention to the following nuances:
Fuel pressure;
air leaks;
Fuel pressure directly depends on the health of the electric fuel pump, which is located in the fuel tank on modern injection cars. The device may have a clogged fuel pump filter mesh, there may be problems with the fuel pump electric motor or the power supply to the pump. It is also worth checking the fuel rail pressure regulator valve. Low pressure in the fuel supply system is often the cause of triplet.
The next step is to check the injection nozzles. This element tends to clog, as a result of which the throughput decreases, the shape of the spray pattern is disturbed, etc. Also, the failure of the nozzle itself should not be ruled out. To clean and check the nozzles, you can use a flushing stand, on which a special flushing liquid is pumped through the device and power is supplied. In such conditions, the operation of the injector on the engine is simulated, the performance is evaluated, etc.
You can also check and clean the nozzles yourself. For this, a liquid is also pumped through the device (for example, a carburetor cleaner). Power is supplied through a simple circuit with a light bulb from the battery terminal.
A working injector should not leak when closed. Also, the injector must open in a timely manner when an electrical impulse is applied. The injector is not allowed to pour fuel, since the efficiency of the subsequent combustion of the charge in the cylinder depends on the quality of the spray.
If the fuel pressure and the injector itself are in order, then the ECU should be checked. The control unit itself rarely fails, but it is possible. More often this happens in those cases when the factory firmware was changed when installing HBO or the engine was done with software chip tuning. Unprofessional manipulation of fuel cards can lead to the fact that the ECU overflows fuel and fills the spark plugs.
Reduced compression in cylinders
Loss of compression indicates engine malfunction or wear. One or more cylinders are partially or completely not working, so fuel and air are supplied, but the mixture is not compressed properly. In this case, normal combustion does not occur. A drop in compression occurs due to burnout of pistons or valves, severe wear of piston rings and other defects of the BC, cylinder head or timing elements.
In this case, it is necessary to measure the compression in the engine, after which the unit is disassembled for detailed diagnostics and repair. In conclusion, I would like to add that the operation of a motor with an inoperative cylinder is prohibited, since driving with such a malfunction leads to a number of additional problems, which greatly complicates and makes subsequent repairs more expensive.
Specifications
Technical parameters of Chery Fora 2.0 / Chery Fora in the back (A21) 4 doors. a sedan with an engine of 128 hp, 5MKPP, produced from 2006 to 2010
One of the most common engine malfunctions is interruptions in the operation of one or more of its cylinders, about which among motorists they say "the engine troit". Anyone who has encountered this phenomenon is probably familiar with its symptoms. But what are the causes and consequences of such a breakdown, not all motorists know. Today we will tell you in detail why the engine is troit, how to diagnose and properly repair the engine.
Reasons why the engine "troit"
The engine can be tripled constantly or from time to time. The general signs of the engine triple structure are as follows: at idle, strong uneven vibrations begin to penetrate from the engine compartment into the passenger compartment, the sound of a running engine changes (it “growls”, goes from high “notes” to low ones, and vice versa). The unit begins to consume more fuel, and its power decreases at the same time, and indecent sounds are heard from the exhaust pipe, accompanied by thick smoke of white or black. If at least one of these signs is present, it means that the "heart" of your car has problems with one or more cylinders. If they are not eliminated in time, the consequences can be very dire - right down to the power unit.
Let's characterize the most common reasons why the engine is troit - there are four of them:
- late or early ignition of the fuel-air mixture (FA);
- uneven ingress of fuel into the engine cylinder;
- lack or excess of air in the combustion chamber of the cylinder;
- drop in compression level.
Let's consider them in more detail.
Reason # 1... If the air-fuel mixture ignites in the cylinder earlier or later than the specified period, then the spark plugs are to blame, which produce a too weak spark, or the spark does not form in time. Weak sparking occurs due to the fact that harmful deposits (carbon deposits) accumulate on the body of the candle and its electrodes, which interfere with the breakdown of the spark.
Another reason for a weak spark is the destruction of its insulator. In the place where the insulator collapsed, a carbon stain forms, which prevents the formation of a normal spark. If there is no spark at all, then there may be several reasons: a worn-out spark plug cap, a broken high-voltage wire (supplies current to), breakdown of the ignition coils or switch. The latter phenomenon is quite rare, but it will not be superfluous to check the status of the switch, which controls the ignition distribution.
Reason # 2... The uneven ingress of fuel into the cylinder, when a smaller amount is poured into the combustion chamber, is often due to a malfunction of the parts of the fuel pump (injection part or pressure reducing valve) or the pressure valve in the fuel supply system. If more than necessary amount of fuel enters the cylinder, the problem probably lies in the fuel injectors - they are dirty or out of order. Finally, another "fuel" reason for the engine triple formation is a malfunction in the electronic control unit (ECU) of the power unit, which can mistakenly increase or decrease the supply of gasoline / diesel to the cylinder.
Reason # 3... Excess air in the cylinder is a sign of a depressurization of the air supply system, which includes the air filter, intake pipe hose, throttle pipe and air receiver. Lack of this important component of the air-fuel mixture in the cylinder can be caused by a dirty air filter or broken throttle valves.
A malfunction of the mass air flow rate or the throttle position sensor, which the ECU perceives as a motor requirement to add or subtract the amount of air in the combustion chamber, can also cause the motor to triple.
Reason # 4... Low or none of it is perhaps the most serious reason the engine is troit. This is the first sign that pistons or a valve are burnt out in an idle cylinder, or the piston rings are completely worn out. Here you cannot do without serious repairs to the power unit.
In addition to the common reasons why the engine is troit, there are also minor ones. They are spoken of when the engine troit periodically - "cold" (at) or "hot" (at medium or high speeds). Here, the most common malfunction is valves: when their clearance increases at idle speed, the engine triplets appear, which passes as it warms up (the gap is restored). Conversely, the gap increases when the engine reaches operating temperatures - then it is troit "hot" with all the features described above.
Diagnostic methods
If all the signs that the engine is troit are evident, it is necessary to diagnose it and determine which cylinder is out of order and for what reason. You can check it yourself, or you can drive the car to a service station, where its power unit is subjected to detailed computer diagnostics. In most cases, you can determine the cause of the triplet motor yourself, but if the cylinder refused to work, for example, due to low compression, it is better to seek help from an experienced minder.
Step 1. Determine the problem cylinder. We check the operation of the cylinders with the engine running, so all safety measures must be observed. We turn on the ignition, open the hood, listen to the engine. We remember what sound it works with. We begin one by one to disconnect the high-voltage wires going to the spark plugs.
When the slave cylinder is turned off, the motor begins to triple with a vengeance. Disconnecting the spark plug on a non-working cylinder will not change the behavior of the motor. Another way - we do not touch the high-voltage wires, but one by one we turn off the chips that control the supply of fuel from the injectors to the cylinders. When one of the chips is turned off, the engine operation will not change - this is how we will find a flapping cylinder.
Step 2. We check the condition of the high-voltage wire and spark plug. Disconnect the high-voltage wire and inspect it carefully. If we notice damage to the insulating layer, it means that the cause of the malfunction is precisely in the wire. It is also useful to check the integrity of the conductive core - if it is broken or burnt out, then a breakdown or internal resistance occurs (measured with a multimeter, check with normal readings), which interferes with the normal supply of current to the candle. But if the wire is intact, then the problem is the spark plug. We must unscrew it and examine it carefully.
If you find visible damage to the base of the plug or its electrodes (carbon deposits), then it will have to be replaced. If the spark plug is intact, we are looking for the problem on which the engine goes further.
Step 3. We measure whether enough air enters the cylinder. The lack of air enriches the fuel assemblies, which leads to the motor tripping. We check the tightness of the air supply system: we shut off the intake pipe, supply air to the cylinder with a compressor through a vacuum hose at a pressure of 0.5-0.7 atm., Listen. If a characteristic hiss is heard, it means that the air supply system is depressurized. Another diagnostic method is to check the air filter. If it is clogged, little air enters the cylinder. We also diagnose the mass air supply sensor - for this we need a laptop, which we connect to the diagnostic connector.
Step 4... Determine how much fuel enters the cylinder. To do this, we measure the pressure in the fuel system with a pressure gauge (up to 7 atm.), Which we attach to the injector rail. It is necessary to measure the pressure in 4 stages: when the ignition is turned on, at idle, at operating speed with the pipe removed from the fuel pressure regulator and with the pinched tube of the check valve. If it is low, then the elements of the fuel pump or the pressure valve in the fuel supply system are probably out of order. If normal, we check the condition of the injectors, they may become dirty or even fail. Finally, we check the operation of the fuel system using the diagnostic equipment - there may be errors in the ECU.
Step 5. We measure the compression in the cylinder using a compression gauge, which we insert into the hole of the spark plug of the problem cylinder, turn on the ignition and increase the engine speed. We take readings several times. If the compression drops by 15%, then the piston, valves or piston rings in the cylinder are worn out. To determine the indicated damage, you will have to disassemble the engine.
How to prevent the engine from troilus
After diagnosing and determining why the engine is troit, we proceed to correct the situation. Well, if the problem is only in candles or high-voltage wires, you can. The same is about the ignition coils and the switch. But if the reason is a clogged fuel or air system, then you have to tinker. The contaminated nozzles must be flushed with a special agent (for example, Injection System Purge), if necessary, we change the oxygen sensor (), since it will most likely not work correctly too.
dirty and clean nozzles
If flushing did not give a result (fuel continues to fill the candle), then we change them to new ones. The same applies to the fuel pump and other elements of the fuel system that fail when the engine is tripled - it is better to replace them than to repair and put in place. Replacing the air filter and elements of the air supply system, which are depressurized, are also necessary during repairs. Well, the final chord is the correction of ECU errors that lead to the engine triplet.
