Why does the Priora engine smoke?

14.8.2. Exhaust smoke analysis

GENERAL INFORMATION

A diagnostic examination would be incomplete without analyzing the vehicle's exhaust smoke.
It’s already warmed up enough, so it’s time to approach its “loin” and look “under the horse’s tail.” The exhaust from a working engine is almost colorless. A barely noticeable light white smoke emerges from the exhaust pipe, the intensity of which intensifies when you sharply press the gas pedal.

In frosty weather, a working car leaves behind rather thick clouds of white steam (not to be confused with smoke!), indicating complete combustion of the fuel.

Inhaling exhaust fumes for a long time is more expensive for yourself. We turn off the engine. But this is not the end yet. It is worth examining the inner surface of the oil filler plug. The presence of traces of foamed emulsion of a dirty yellow color on it is a very alarming symptom, indicating that antifreeze is seeping into the oil. After removing the cap of the expansion tank or radiator, inspect the antifreeze. Attention: to avoid injury, do this when the engine is cool! An oil film on the surface of the antifreeze, just like foamed motor oil, is a harbinger of urgent engine repair.

That's probably all. We completely examined the “patient”, literally walking from the tip of his nose to his tail. And during the inspection they used not expensive equipment, inaccessible to most car enthusiasts, but what was given to us by nature: vision, hearing, smell and, of course, the mysterious “gray matter”.

Exhaust smoke analysis

An oily ring 6-8 mm wide on the outer surface of a car exhaust pipe (“mourning rim”) is a consequence of increased oil consumption. A major engine overhaul is inevitable.

Black smoke

A sign of incomplete combustion of fuel. The power system prepares a very rich mixture and needs to be adjusted.

Smoke of a bluish (purple) hue

A sign of increased oil consumption. The engine requires replacement of oil seals or repair of the cylinder-piston group.

Thick white smoke

Sign of a burnt engine cylinder head gasket. The coolant enters the combustion chamber.

Smoke with the smell of exhaust gases from the removed pipe of the engine crankcase ventilation system (breather)

A sign of exhaust gas breakthrough into the oil crankcase due to increased gaps in the cylinder-piston group.

Many car enthusiasts noticed that their car began to emit black smoke from the exhaust pipe. But not everyone understands the reasons for this effect, as well as methods for eliminating it.

Where does it go?

The correct operation of internal combustion engines largely depends on whether there is a sufficient amount of lubricants inside. Oil, as noted above, is necessary to reduce friction between the rubbing surfaces of parts. The most intense friction is in the parts of the cylinder-piston group. Since high temperatures are constantly maintained in the engine, some of the oil burns out in the cylinders and is then removed along with the exhaust gases. Also, part of the lubricating fluid settles on the cylinder walls, on valve seats, and on oil scraper piston rings.

Increased consumption, complaints from drivers that the Priora is consuming oil - this is a sign that the engine has one or more malfunctions. Most often, the reason is very banal - it is natural wear and tear of the CPG. The first call is oil in the crankcase ventilation system. This happens due to high gas pressure in the crankcase. This pressure will increase as the engine wears out.

The nature of the appearance of bluish smoke from a car exhaust pipe

An unusual color of exhaust gases always means that one of the vehicle's systems or components is faulty.
Based on simple observation, it is possible to determine the breakdown of a certain mechanism. If, for example, a white exhaust indicates the presence of coolant in the cylinders, and a black indicates a supersaturated mixture, then the main reason for blue smoke from the muffler is oil combustion in the internal combustion engine . This is where its name comes from - “oil”, which indicates serious problems with the engine.

At the same time, it must be taken into account that exhaust gases can have different shades, and this depends on many factors, including:

degree of engine warm-up;
composition and quality of motor oil;
number of revolutions;
external light conditions and ambient air humidity.

It is obvious to assume that “oily” exhaust is certainly accompanied by increased consumption of engine oil. This is actually true, for example, if at a standard consumption of 10 g per 100 km, blue smoke from the exhaust pipe appears only in transient modes, then exceeding the operating standards for oil consumption (ICE wear) will be expressed in the same way, only now in constant motion mode.

Where does the oil go?

The correct operation of an internal combustion engine largely depends on a sufficient amount of lubricant. It is used to reduce friction between moving parts. The greatest friction, as a rule, is in the piston group of the power unit. Since a high temperature is constantly maintained in the internal combustion engine, a certain part of the lubricant burns, being removed with the exhaust gases or deposited on the walls of the combustion chamber, valve seats or on the piston rings.

The figures mentioned above regarding engine oil consumption are approximate: for each car this indicator is strictly individual and is prescribed by the manufacturer in the technical documentation for the vehicle.

High fuel consumption, complaints “the car is eating lubricant” are a sign of engine malfunction. The main reason in most cases is simple wear and tear. The first signs are the appearance of liquid in the ventilation system, from where, in the absence of proper care and repair work, it enters the air filter. This happens due to the increase in crankcase gas pressure, which increases as the engine wears, which pushes lubricant into the breather.

A turbocharged engine consumes liquid in huge quantities in most cases due to wear on the turbine rotor bushings. Accordingly, it is important for owners of such cars not only to monitor the condition of the engine, but also the turbine.

Useful information about violations of lubricant consumption in a car

How to get rid of black exhaust

Carburetor malfunctions...

How to deal with it? How to eliminate a malfunction in the fuel supply system and establish the process of creating an enriched combustible mixture in which air and atomized fuel would be contained in the proportions necessary for normal engine operation? In fact, you need to look for the true cause of the malfunction. As already mentioned, this could be (if we are talking about a carburetor engine) a clogged air filter that does not allow enough air into the system. Black exhaust from the muffler may be a consequence of a clogged hole in the nozzle through which air does not flow, or the reason may lie in the excessive supply of gasoline (if the float chamber is incorrectly adjusted and the fuel level in the carburetor goes off scale).

Oil consumption rates for Lada Priora

The car can be equipped with one of four engines. Each modification has its own expense. Thus, an 8-valve 1.6-liter engine with a power of 87 horsepower should consume up to 50 grams per thousand kilometers according to standards. The VAZ-21126 model with a power of 98 horsepower should also, according to the manufacturer, have modest appetites. The 1.8 liter model (VAZ-211128) has an oil consumption rate of 300 grams per thousand kilometers.

For 1.6 units, the oil consumption rate does not exceed 50 grams. The latest engine is modernized. Its key features are that with a standard cylinder block, the developers changed the stroke of the pistons by using a different crankshaft and shorter connecting rods. This technical solution led to increased loads on the engine, or more precisely on the pistons, rings, cylinder block walls and connecting rods.

In some cases, if the engine is severely worn out, the Priora consumes up to 3 liters of oil per thousand kilometers. Let's look at the main reasons for increased oil appetite in a car.

The nature of smoke and the degree of wear of the power unit

Experienced specialists, based on their own observations or the client’s descriptions of the characteristics of smoke, can with a high degree of probability guess the nature of the problem. Let's look at a few common cases :

If the blue-white exhaust appears only when the engine warms up and gradually disappears as it warms up, then there is no reason to fear serious wear of the mechanisms. This effect is explained by the ability of parts to expand; when heated, the gaps decrease and oil leakage stops.
In the case when, after warming up the power unit, smoking not only continues, but also intensifies, it can be argued that there is significant wear of the internal combustion engine elements. The reason is the following - the expansion is not enough to reliably seal the gaps and through them hot oil easily penetrates into the cylinders.

It goes without saying that blue or blue-white smoke from the muffler is accompanied by increased oil consumption. Therefore, monitoring its level using a dipstick is a necessary operation, which makes it possible to determine a breakdown in the early stages of its occurrence. Exceeding the consumption rate of lubricants should immediately alert the owner. In addition, on modern cars, due to the fact that they are equipped with a neutralizer that can purify gases, it is not always possible to determine the color of the exhaust even with increased oil consumption.

We must not forget about such a phenomenon as compression, the degree of which can sometimes be misleading. So, at first glance, wear of the CPG elements is quite often characterized by loss of compression and increased crankcase gas pressure. However, at the same time, a significant amount of oil seals the gaps and if they are not very far from standard, then the compression gauge readings may be normal, and sometimes closer to the upper limit.

Posts 1 page 17 of 17

Share109.07.2015 13:38

Good afternoon. The problem is this. When accelerating, at high speeds (more than 3500), barely noticeable bluish smoke comes out of the pipe (you drive 1-3 km along the highway and the smoke stops), oil consumption in the urban cycle is no more than 1 liter per 8000 (from replacement to replacement), if you drive On the highway it’s 300g per 1500 km. (under aggressive acceleration). During a cold start and over-acceleration, no bluish smoke is observed, the spark plugs are clean and dry. Mileage 245k. 95 Lukoil, idemitsu extrime oil 10/40 semi-blue. Should I replace the caps or rings? or both.?

Edited by RomaM (07/09/2015 13:39)

Share209.07.2015 13:42

Good afternoon. The problem is this. When accelerating, at high speeds (more than 3500), barely noticeable bluish smoke comes out of the pipe (you drive 1-3 km along the highway and the smoke stops), oil consumption in the urban cycle is no more than 1 liter per 8000 (from replacement to replacement), if you drive On the highway it’s 300g per 1500 km. (under aggressive acceleration). During a cold start and over-acceleration, no bluish smoke is observed, the spark plugs are clean and dry. Mileage 245k. 95 Lukoil, idemitsu extrime oil 10/40 semi-blue. Should I replace the caps or rings? or both.?

Edited by RomaM (Today 13:39)

Both. It was the same thing, only the breather was still in the cabin, I changed the caps, the stink disappeared, the smoke stopped, but there was still a burning sensation, although less

Causes of blue smoke from the exhaust pipe of Priora 16 valves

My oil consumption is crazy. Probably 600 grams per thousand.

nothing smokes, nothing drips from anywhere.

and the most interesting thing is that the entire receiver is covered in oil. but the throttle body is dry. that is, the oil is thrown back into the intake, as I understand it. Or does it drive so much through the small crankcase ventilation? There, as I looked, it was dry, not a trace of oil.

Car VAZ 21120 1.5 l 16 cl. 2004 110,000 km mileage. Blue smoke appeared from the muffler and began to “eat oil” (a little bit, but still). Tell me, what is this and what does it mean? Thank you in advance)

My oil consumption is crazy. Probably 600 grams per thousand.

nothing smokes, nothing drips from anywhere.

My oil consumption is crazy. Probably 600 grams per thousand.

nothing smokes, nothing drips from anywhere.

Serg_x

The mileage is somewhere around 150 thousand.

I looked at this case for the first time about 7 thousand ago and didn’t notice it. and then I took it apart and was amazed - all these rubber bands were simply filled with oil - floating in it. the entire manifold is covered in oil

Well, the machine eats a lot of oil.

how can it get there? can it be thrown in the opposite direction?

badboy2115

I looked at it when replacing the intake manifold gasket. that is, I looked through the entire intake. rrx and all the insides of the throttle are clean. The low ventilation channel is not clogged - it blows easily and there is no oil afterwards. the traces start from the collector and above. everything is dry at the damper

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Reasons for increased consumption

Several can be highlighted. The most common is wear of the valve stem seals. They are installed in the gas distribution mechanism.

Problems with caps should be solved very carefully, despite their simplicity. So, these elements are made of rubber - it can harden. This probability increases significantly if the engine does not warm up well. “Priors” with high mileage often suffer from this. The cuff (if it is frozen) will not be able to fit tightly into its seat - because of this, the oil will enter the valve sleeve without any obstacles. As a result, the lubricant will enter the cylinders, where it will burn safely. Oil can also get into the exhaust system. There will be characteristic blue smoke.

Car smokes after replacing valves

This is the situation.
There was a burnt valve in the second cylinder. I sent it for repair. I bought valves that needed to be replaced, there were 5 of them, oil caps, 2 camshaft sprockets, chain tensioners, dampers. Done. The car began to smoke like a steam locomotive, only the smoke was not black. I thought antifreeze, the antifreeze did not go away, it was eating oil. The one who did it shouts that my rings are stuck, compression is 12 in all the pots. He says the oil lasts so long.

There is no oil in the breather or smoke from the rocker arm.

So I’m thinking, if it’s a piston, then where does the compression come from and the breather is clean?

ZY, Maybe the valves were not properly ground in? Although I don't know

1. The condition of the oil scraper rings has virtually no effect on compression. The high compression may be due to the oil. In this case, the oil does not flow through the breather, but directly into the cylinders. Try using decarbonizers (at least kerosene, diesel fuel) 2. They could fly off. 3. If the valves were poorly ground, then it would smoke and there would be no compression.

probably, most likely, either the old caps were installed and the new ones healed or fell off (((But the smoke is like from an army smoke bomb, especially after an overnight stay.

decarbonizers, how to use them? Like pour it into the cylinders?

decarbonizers, how to use them? Like pour it into the cylinders? You unscrew the spark plugs, spray them, or pour 10 milliliters (depending on the type and packaging of the decarbonizer) into the cylinders.

Place pieces of rags into the spark plug wells and turn them a little with the starter, five revolutions.

Then add another 5 ml and let it sit for an hour or two.

Then turn the starter again. Add another 5 ml, turn the rag over and twist some more.

The carbon deposits should fly out. True, they still recommend changing the oil after this procedure, but who does it?

The car began to smoke like a steam locomotive, only the smoke was not black. I thought antifreeze, the antifreeze did not go away, it was eating oil. The one who did it shouts that my rings are stuck, compression is 12 in all the pots. He says the oil lasts so long.

There is no oil in the breather or smoke from the rocker arm.

So I’m thinking, if it’s a piston, then where does the compression come from and the breather is clean?

ZY, Maybe the valves were not properly ground in? Although I don't know

It looks like your shoes aren't holding you in place or there's a big gap in the guide bushings

So I’m sinning with the caps, but I won’t decompress myself, I’m still afraid of this engine))) Although previously on a penny there were no problems, you’d scatter the whole engine, assemble it, adjust the valves and go)))

Yes, this master has been hiding for three days now, so as not to lose his temper.

Added after 1 hour 59 minutes 25 seconds There is another question, I remembered. Sometimes the car seems to sneeze. for example, at an intersection you start from the second one and may sneeze when you strain the engine a little. It looks like there is not enough air past the sensor. Although everything is fine there, maybe something is wrong with the ignition?

Z.Y, I’m a little weak in mechanics

Added after 1 minute 52 seconds Yes, this master has been hiding for three days now, so as not to lose his temper. What do you mean, don't punch me in the face?

If oil comes into the exhaust, i.e. blue smoke, similar to steam, then it is very elementary to check whether the rings or caps are to blame. The method is very simple.

You are driving on a flat road at a speed of 60-100 km/h. Notice the amount of smoke from behind. Without turning off the gear, release the gas (like braking with the engine) for 3-6 seconds. Without turning off the gear, we press on the gas. If, when you press the gas, a huge cloud of smoke appears from behind (more than when driving evenly), then the caps are to blame. If there is as much smoke as there was before the gas was released, then the rings are stuck.

The procedure can be repeated several times. This is if it is difficult to disassemble right away. It is advisable to have a separate person sit for observation... And then, sometimes it is difficult to catch the difference in the mirror... especially if it is tinted. or side wind.

If oil comes into the exhaust, i.e. blue smoke, similar to steam, then it is very elementary to check whether the rings or caps are to blame. The method is very simple.

It is when you give in that the smoke becomes more, but at idle or even speeds it remains the same.

Added after 1 minute 52 seconds What do you mean, don't punch it in the face?

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Reasons for increased oil consumption

There may be several reasons why the power unit consumes lubricant. The most common reason that Priora eats lubricant is low-removable caps. They are installed in the valves of the gas distribution system. You need to deal with them carefully, as unusual situations may arise. For example, the likelihood of hardening of the cap seals increases significantly due to a poorly warmed-up engine, which is especially true for priors with high mileage. A frozen cuff will not fit tightly enough into place, causing lubricant to flow freely under the bushing. The result of this will be either lubricant entering the combustion chamber or into the exhaust system, followed by the formation of carbon deposits on the spark plugs or interruptions in engine operation.

What to do if the engine smokes when cold

If, after a long period of inactivity, the machine smokes heavily, and after a while it stops, then the check must be performed according to the following algorithm:

Estimate the mileage of the car's engine, and also remember what kind of engine oil is poured into the crankcase and how long ago it was changed. Accordingly, if the engine is worn out and low-viscosity oil is poured into it, then it makes sense to replace it with a thicker one. Along with changing the engine oil, do not forget to replace the oil filter, and it is advisable to use the original filter. If the oil is old and the engine has a high mileage, then before directly changing the oil, it is advisable to flush the oil system.
The appearance of bluish or black smoke on a cold engine is a reason to check the compression and condition of the piston rings. If the compression is low, you need to find out the reason. In some cases, the cause can be eliminated by decarbonizing the rings. Along with decoking, it is also advisable to pour flushing oil into the engine for cleaning purposes, and then change the oil to a new one, but taking into account the viscosity according to the condition of the engine and its mileage. If there is consistently high oil consumption, then it makes sense to change the piston rings.
Check the condition of the valve stem seals. This is a fairly common reason why a car smokes when cold. For domestic cars, the approximate mileage before the next replacement of caps is about 80 thousand kilometers. For foreign cars, taking into account the use of high-quality oil, this mileage can be two to three times longer.
Perform a sensor check using a scan tool. If it shows an error in any of the nodes, then you should treat it more carefully and replace it.
Check the oil level and condition. An increase in volume or a change in color may indicate the presence of antifreeze. If the level of one of the liquids decreases, you need to perform additional diagnostics - check the valve stem seals, rings, and cylinder head gasket.

For owners of diesel engines, in addition to the above recommendations, it is also advisable to perform several additional procedures.

If, in addition to smoke after starting, the engine also “troubles”, then you need to check the condition of the fuel injectors. If you identify a faulty or contaminated injector, you must first clean it, and if this does not help, replace it with a new one.
Check and, if necessary, clean the EGR.
Check the operation of the high pressure pump, check valve and the fuel line as a whole for fuel leaks.

Conclusion

According to statistics, in approximately 90% of cases, the reason that a car smokes when cold is faulty valve stem seals. Therefore, first of all, you need to check their condition. After this, you need to check the condition of the piston rings, viscosity and general condition of the oil. It would not be superfluous to diagnose the control unit for errors. The fastest way to diagnose and find out the origin of the smoke is to use an ordinary sheet of white paper near the exhaust. By the traces and smell remaining on it, you can quickly determine what is entering the combustion chamber - liquid, fuel or oil.

Low quality oils

One of the reasons for increased consumption is the low quality of this same oil or the wrong choice. For each engine, including the Lada Priora, there are certain tolerances. But if you make the wrong choice, your consumption can skyrocket. For example, reduced viscosity can cause the rings to fail and collect lubricant from the cylinder walls. Therefore, the lubricant will settle on the walls of the combustion chamber and, as a result, will burn along with the fuel.

As a result, exhaust gases will come out in the form of bluish smoke, and the oil will settle as soot on the spark plugs. For the same reason, the rings become coked. Oil settles in a very thick layer on engine parts and components.

Diesel

For a diesel power unit, black smoke from the exhaust pipe is normal. So, the engine's particulate filter fails and requires replacement. Also, the cause may be a malfunction of the high pressure fuel pump, which does not control the fuel supply and simply floods the cylinders of the power unit.

There is a second danger for a diesel engine: if the cylinders are flooded and the fuel does not ignite, this can almost lead to water hammer. Also, the consequence can be considered that the degree of burnout of the valve mechanism and piston group increases, which undoubtedly leads to a major overhaul of the power unit.

It is worth noting that when black smoke repeatedly comes from the engine, then most likely the engine has carbon deposits on the walls and in the main components. To eliminate the problem, it is worth disassembling the engine and cleaning it.

Piston rings

Another reason why a car eats special fluid is the piston rings. Each piston has three rings - an oil scraper ring on the bottom and two compression rings on top. The automaker uses compression rings to reduce the distance between the cylinder wall and the piston itself, thereby achieving maximum energy transfer to the engine. To reduce the friction created, lubricating fluid is supplied to the compression rings, which is then removed by oil scraper rings. The wear of these rings is the reason why the Priora eats the special fluid - they simply leave excess lubricant on the cylinder walls. So the reason for increased waste of lubricant may be piston rings, but not always engine malfunction.

Engine oil operation

Over the course of its entire “life,” Priora is subjected to a huge number of heating-cooling cycles. Accordingly, a high load falls on all components and parts of the motor. A decrease in the elasticity of the piston rings or their wear can cause a phenomenon such as flutter. This phenomenon has been poorly studied, but it is known that during engine operation, the rings move around the piston radius with a certain frequency, but at the same time they can jump from one edge of the piston groove to the other. Such sharp jumps are the reason that the Priora eats large quantities of lubricant, but does not smoke, although a clear sign of such a malfunction is the bluish-colored exhaust smoke.

Why does blue smoke come from the muffler and the reasons for its appearance?

While the car is new, few people pay attention to the condition of the exhaust gases and think that problems can be determined by their color. However, over time, especially if you do not pay due attention to vehicle maintenance, a more experienced neighbor in the garage will tell you about the appearance of a non-standard exhaust. Knowing the reasons for this phenomenon will certainly help to avoid unpleasant moments in the future, especially when buying a used car. What useful information on the topic is contained in the article:

Natural wear and tear

If the Priora engine consumes oil, then most likely the engine has a high mileage, and the reason for oil consumption is the natural wear and tear of the engine itself and its individual components. As a result, oil will be consumed much faster than during normal operation. Engine wear can also be the cause of cylinder deformation, cracks, gasket burnout, and failure of engine seals. Motor oils can be deposited in engine parts and components, but it can be difficult to determine how large the excess consumption is. It depends on how worn out the engine and other systems in the car are.

Reason #1

If, after the engine has been idling for several minutes, you press the gas pedal to the floor several times, a thick cloud of bluish smoke may escape from the chimney. As the number of presses increases, the smoke will disappear, but this is one of the signs of engine malfunction. The reason is the valve stem seals.

An oil leak while the engine is running in idle mode and then its sudden combustion in the cylinders leads to the appearance of this thick smoky cloud and an increase in oil consumption. But replacing the caps cannot always solve this problem. Sometimes, if a Priora consumes oil, the reasons may be in the valve bushings. Experts recommend changing them along with the valve stem seals.

Valve seals or rings: how to determine what caused the blue smoke

If you've done a quick study of the issue, you've probably noticed that there is a lot of conflicting information. For example, there is a lot of controversy around the same compression: some argue that with normal pressure in the cylinders there is no reason to go into the piston, others insist that this is not an indicator at all in the current situation. And regarding the relationship between the engine temperature, the position of the gas pedal and the time of appearance of bluish smoke, it is not at all clear what’s what.

Let us immediately note that there is no connection between compression and defective oil scraper rings. Firstly, the rings that scrape oil from the cylinders wear out or become stuck first, while the compression rings continue to work as expected. Secondly, even with slightly worn compression rings and damaged oil scraper rings, compression will be normal, since the oil remains on the cylinder walls.

At the same time, unspoken differences exist that make it possible to determine what exactly has failed: caps or oil scraper rings. The difference is that each group of parts produces blue smoke at different intervals.

Symptoms of problems with caps

In the old days, stiff or worn valve seals were indicated by a puff of bluish smoke that burst out of the exhaust pipe immediately after starting the engine. By the way, these observations have not lost their relevance today. Even in this situation, it would be a good idea to ask how much the work costs and what else needs to be changed when replacing the valve stem seals on the engine.

The following test will help you accurately judge the caps for replacement:

Warm up the engine to operating temperature.
Let the engine run for 5-7 minutes while warm.
Sharply depress the gas pedal for 5-10 seconds and watch the exhaust gases at this moment.

If there are problems with the seals, in the first seconds of the “gas to the floor” mode, a cloud of smoke with a bright bluish tint flies out of the muffler. For extra confidence, repeat the attempt to throttle to failure 2-3 more times. Observations are such that in subsequent cycles the puff of smoke will lose saturation, and may even disappear altogether.

For your information. The most reliable diagnosis is considered to be based on the color of the exhaust, in which “gas to the floor” is given after warming up and running the engine at operating temperature for 5-7 minutes. The bluish tint under such conditions turns out to be much more saturated than during the morning start and other gas conditions.

What explains this prioritization? If the cap is worn, oil will flow down the valve stem when the engine is running. Whether it will accumulate on the valve plate or immediately enter the cylinders is determined by the angle of the throttle valve. So, at idle, the speed of the air mass is low, the oil is not removed from the plate, but continues to accumulate. As soon as you sharply (it is important to press this way) press the gas pedal, air or the fuel-air mixture (depending on the type of fuel injection) draws the accumulated oil emulsion into the cylinders and it burns, forming a bluish smoke.

There will be no ominous tint at revs, and, in fact, there shouldn’t be. The oil does not have time to accumulate, but immediately enters the cylinders and burns in small fractions, which is why it does not affect the color of the exhaust gases.

It is worth noting that with a new catalyst, the color of the exhaust may not change at all, since it qualitatively converts CH into water vapor. On a half-dead catalytic converter or installed flame arrester, the picture appears in all its glory: there is smoke.

How to determine whether oil rings are faulty

Worn rings make themselves felt when under load. In reality, it looks like this: the color of the exhaust gases changes when moving uphill with the gas pedal half-pressed. It is worth noting that looking in the rearview mirror, you are unlikely to draw the right conclusion. The puff of smoke usually dissipates quickly. However, the driver of the car behind may well record his appearance.

For your information. There is an opinion that the initial stage of wear should be determined during gear shifting. If bluish smoke appears at this moment, the rings will need to be replaced soon.

When the rings are worn critically, smoke comes out constantly while driving and regardless of the terrain under the wheels. In addition, an increase in smoke is observed with increasing speed.

What else could cause a bluish-colored exhaust?

A defective turbine and faulty crankcase ventilation can also cause smoke. What distinguishes these failures from current caps or oil rings is the nature of the smoke: there is a lot of smoke + it can appear and disappear at any time. For example, the engine runs smoothly at idle and suddenly starts smoking, and after 3-4 minutes it stops.

A few tips will help you figure out what's going on:

The turbine “drives” oil into the exhaust pipe. Smoke appears only after the exhaust tract has warmed up. There may be an oil leak at the joints of the exhaust system parts.
Crankcase ventilation does not separate the oil from the air mixture. The oil separator is clogged as a result of using low-quality engine lubricant. The intake manifold is covered in streaks of oil emulsion, and clearly behind the ventilation hole.

Low quality motor lubricant

The reason that the engine consumes liquid may be low quality lubricants or the wrong type. For each car, including the Priora, there is a certain type of lubricant, but if it is selected incorrectly, consumption jumps sharply. For example, reduced viscosity can cause the piston rings to be unable to collect all the lubricant, causing it to settle on the cylinder walls and burn along with the fuel. As a result, combustion products either come out along with the exhaust in the form of bluish smoke, or settle in the form of soot on the spark plugs. The consequence may be coking of the rings, when the liquid settles in a thick layer on the engine components.

Reason #2

Sometimes smoke appears when climbing a hill, because you have to constantly press the pedal. The driver may not see the smoke, but those driving behind will see everything perfectly. A thin stream of smoke is a sign of malfunctions in the piston system, as well as increased oil consumption.

Most often, malfunctions are associated with wear of the piston rings and grooves on the piston for the rings. Also, the rings can lie down and, as a result, their properties are lost. If the compression rings are not positioned correctly due to carbon deposits, this is also one of the faults that causes blue smoke.

Cylinders can also fail. This leads to a decrease in compression. This problem can only be solved with the help of a major overhaul - sleeve or boring. If the pistons fail, the problem can be solved by purchasing and installing new ones.

Many novice car owners ask experienced ones what to do, the Priora is burning oil. You can try using engine decarbonizers.

With the help of special means, the coke is cleared from the rings, and they can become mobile again. Previously, for this, acetone diluted with oil and kerosene was poured into the cylinders. The mixture was then left for a day and then the oil was changed. If this solution does not help, then you can try a miracle drug from the pharmacy - dimexide. This medicine will clear away any carbon deposits and coke.

Parting recommendations

If diagnostic results are unsatisfactory, experienced owners usually act by elimination. First, an attempt is made to decarbonize the oil scraper rings. If this is your first time encountering this concept, we recommend reading about what decarbonization is and why the engine needs it, as well as about the technology for decaburning piston rings using dimexide, as one of the inexpensive and effective means.

If an attempt to remove coke does not bring results, then work is planned on the cylinder head. If replacing the valve stem seals is unsuccessful, then a “overhaul” is performed.

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Should I change the oil if the consumption is high?

Often, car owners, after identifying increased consumption, ask themselves the same question - do they need to change the oil completely every time or is it enough to add fluid from time to time as consumption occurs? Some motorists believe that it makes no sense to perform a complete oil change in this case. During the period, the same amount of lubricant will pass through the engine as if a replacement were being performed.

A complete replacement, in fact, must be carried out in accordance with technical service books and documents. The main function of oil is to reduce friction between rubbing parts and clean the engine. Debris settles in the pan or in the oil filter. But dirt is not removed from the engine. During operation, the amount of carbon deposits will increase, and constantly adding new oil will only compensate for the amount of dirty oil.

Such a liquid will always have a dark color. Therefore, it needs to be changed every 10 thousand, and together with the filter. Otherwise there is a risk of coking.

Car smokes after replacing valves

There is no oil in the breather or smoke from the rocker arm.

So I’m thinking, if it’s a piston, then where does the compression come from and the breather is clean?

ZY, Maybe the valves were not properly ground in? Although I don't know

probably, most likely, either the old caps were installed and the new ones healed or fell off (((But the smoke is like from an army smoke bomb, especially after an overnight stay.

decarbonizers, how to use them? Like pour it into the cylinders?

You unscrew the spark plugs, spray them, or pour 10 milliliters (depending on the type and packaging of the decarbonizer) into the cylinders.

Place pieces of rags into the spark plug wells and turn them a little with the starter, five revolutions.

Then add another 5 ml and let it sit for an hour or two.

Then turn the starter again. Add another 5 ml, turn the rag over and twist some more.

The carbon deposits should fly out. True, they still recommend changing the oil after this procedure, but who does it?