The overhaul of the V8 QX80 resulted in the use of unapproved oil. Mileage 78t.km. Dealer service only.

1. metallic sound. Fault - Timing chains. The reason is the wear of the timing chains as a result of natural wear or untimely maintenance (ICE operation with insufficient oil level, engine overheating, use of low-quality or inappropriate oils for the operating mode). Repair - Replacement of chains and faulty timing elements.
2. A loud rumbling sound. Malfunction of the timing mechanism. The reason is the critical wear of the timing chains and elements, due to the lack of attention to the causes and symptoms described in paragraph 1. Repair is, unfortunately, an expensive undertaking, but it is REPAIR and not a major overhaul, sleeve, boring! Complete disassembly and reassembly of the unit is required. Replacement of the timing mechanism, connecting rod bearings, a set of piston rings, gaskets and other parts of a one-time installation. Cleaning of all oil and cooling channels. The cost is about 230-250 thousand rubles (including the cost of spare parts and consumables).

Power drop (motor vibration, jerks when switching automatic transmission from 1-2-3). The reason is in the valve mechanism, due to the use of low-quality oil and / or its insufficient level, as well as the design feature of the engine. It will be necessary to clean the valve mechanism using TYUNAP technology and a special program for Consalt III +. Note: the inlet channels of the mechanism (valve seats) are mostly coked.

1. Power drop (motor vibration, jerks when switching automatic transmission from 1-2-3, poor start). The reason is the failure of a high pressure nozzle or several. Replacement of defective injectors is required (unfortunately, they cannot be restored at the stand, unlike conventional ones)
2. Will not start (starts and stalls, does not gain momentum). Malfunction - high-pressure fuel pump (oil supply channel to the pusher is clogged). The reason is the operation of the internal combustion engine with an insufficient oil level, engine overheating, the use of low-quality or inappropriate oils for the operating mode. In most cases, repair is not possible; replacement of the assembly will be required.
3. The Throttle Body is a rare success for the manufacturer, will not cause problems for the owner of the QX56, unlike other models of Infiniti engines.

Automatic transmission

Twitch. Malfunction, software failures caused by voltage drops in the on-board network or non-standard electrical / electronic equipment. Repair consists in eliminating the causes and reinstalling the software.

Tremors. Fault - clogged; automatic transmission oil channels, channels of its cooling system, cooling radiators. The reason is overheating of the automatic transmission fluid. Repair consists in the consistent elimination of the causes and consequences of overheating.

razdatka (distributing box)

1. Transfer case modes do not switch. Malfunction, no signal from sensors. The reason is corrosion. Repair - elimination of causes and replacement of sensors.
2. Distributor hum. Depreciation of the auto mode circuit, as a result of the use of oils that do not have a permit (or have, but do not correspond to the operating mode) and their untimely replacement. Repair - replacement of the node.

SUSPENSION AND BRAKING SYSTEM

1. Car roll, roll. Caused by a pressure drop in the suspension hydraulic accumulator system due to a leak. Repair, elimination of causes and further step-by-step restoration and adaptation of the system.
2. Squeal when braking. Reason, caliper (design flaw). Repair will be required only in case of more serious consequences, such as jamming of calipers. Regular maintenance of mechanisms is required, preferably as part of maintenance.

No indication of tire pressure. The reason is that the resource of the power supply built into the tire pressure sensor has expired or, in most cases, its mechanical damage during tire fitting on equipment not intended for large-radius and low-profile wheels. And even more often, it's just the incompetence of employees of non-core services.

AIR CONDITIONER (Climate control)

Increased noise during operation. Ingress of compressor wear products from the system due to non-observance of the refueling technology. Repair - replacement of the air conditioner dryer (required for each refueling of the system) and subsequent refueling with preliminary evacuation of the system.

1. Does not work on the back of the car. Corrosion of the rear circuit pipes. Repair consists in identifying the leak, eliminating it and refilling the system.

ELECTRIC (ELECTONICS)

1. Surround cameras do not work. Factory defect. The block needs to be replaced.
2. Auto up front windows not working. Factory defect. Mechanism replacement.

(with a simple power off, you just need to train them)

1. Corrosion in places where chrome elements come into contact with paint. The reason is a manufacturer's defect. Parts can only be repainted, but in the future or before rust spots appear, the problem is solved by applying a film sticker that excludes contact between parts.

Despite the brutal appearance, the Infiniti QX56 requires careful and careful treatment ... Why is this luxury SUV not on the list of models popular with car thieves, and why does the CASCO insurance not scare you with terms and numbers?

The answer about the elusive Joe, who no one needs, does not count. Are there any other options? Not? Well then, let's try to see what the QX56 is like in operation.

CERAMICS AND LIFE
This largest Infiniti is, to put it mildly, very exotic. Its gross weight of only a couple of hundred kilograms falls short of category C, that is, three and a half tons. Its only possible motor contains more than three hundred "horses". It has a frame and a low gear in the transfer case, but all suspensions are independent. In general, something similar to the GAZ-66 military truck that turned into a dead end branch of development. Nevertheless, the QX56 has something in common with the notorious “shishiga”: both of them rarely recline their skates just like that, out of the blue. They signal for a long time with sounds, knocks, smudges, twitches, burning lights (yes, and the "sixty-sixth" has a couple of control lights) that it's time to surrender to good hands for repairs.

A 5.6-liter V8 petrol engine with a 529 Nm dump torque accelerates the car to a hundred, according to the declared data, a little less than 8 seconds. He eats, however, while in the city about 26 liters per hundred kilometers, and on the highway in a quiet mode - about 15-16 liters. And the oil consumption when driving at high speeds or with a heavy load - say, when towing a trailer - can easily turn out to be such that by the next replacement it will simply not be on the dipstick.

The design of the motor has no weaknesses, but there is a reason why the engine can become completely unrepairable: from low-quality gasoline, the front catalysts crumble into ceramic dust. She, once inside the motor, “lifts up” everything that she reaches. This dust cannot fly anywhere, because rear catalysts stand in its way, which it also clogs. So if the diagnostics gives errors on the lambda probes, you must immediately change all four catalysts or install a Stillen tuning exhaust system where there are no catalysts. Any of these options with work will cost a little more than 100,000 rubles.

If the engine pulls poorly, then most likely the gasoline pump has begun a protracted agony. The reason is the same dirty gasoline and frequent trips with low fuel levels.

ROLL SHAFT
By type of drive, the QX56 is a versatile SUV. Under normal conditions, the rear wheels get the moment. I must say that all the copies officially supplied to Russia since 2007 were all-wheel drive. Well, if there is no Auto 4WD, 4H, 4L mode switch in the cabin, then we have a mono-drive “American”.

Both the transfer case and the automatic gearbox are quite reliable. True, the “machine” can fail due to current hoses: a characteristic weak point is at the junction of rubber with metal. There were also complaints about the buggy switch for selecting transfer modes.

More serious problems can arise with the front axle: the destruction of the gearbox, the twisting of the axle shaft, usually the right one, and the left one falling out. There is an opinion that this is provoked by sharp starts in 4H or Auto mode with the wheels turned out. What does it cost a powerful motor to twist some kind of iron stick into a ram's horn?

Impressively thick gimbals are made with interchangeable crosses, but front crosses are only available assembled with a shaft.

The suspensions are distinguished by a good resource, with the exception of the struts and bushings of the front stabilizer, which in our conditions can withstand 20-40 thousand km. With a run of just over a hundred, it's time to update the shock absorbers, and a little later, the rear hubs will surely buzz (they change as an assembly). In steering, power steering hoses require attention - it happens that they flow.

REAGENTS AND MORE
The QX56 also has a number of characteristic sores. For example, due to oxidized contacts in the engine compartment, the operation of the engine control unit is disrupted. Also, Russian chemistry finishes the pipes of the rear air conditioner and the tailgate lock. In winter, the car may not let you inside because of the freezing wires of the door handles. In copies of the first years of production, the air conditioner radiator electric fan, located directly behind the radiator grille, jams, which can cause the wiring harness to burn out. Moreover, this problem is also known in America, so you should not blame the reagents. The anti-icing slurry is also innocent in the current radiators of the cooling system. They get clogged with dirt and burst from, simply speaking, local overheating. Regular washing is the key to a long service life of this part. True, one cannot do without partial dismantling, because the main radiator is located tightly behind the air conditioner radiator.

MATTER: INFINITI QX56

28.02.2018

Infiniti QX56 is Infiniti's full-size luxury SUV, which was created specifically for the American market. The Infiniti brand appeared on the world market not so long ago, but this did not stop Nissan's luxury division from creating the largest passenger car of all officially supplied to us. Usually Infiniti cars have a feminine and sophisticated appearance, which cannot be said about the QX series - a large, brutal car that terrifies drivers moving in the same stream with it. Despite the premium status of this model, it quickly depreciates in the secondary market, but now we’ll try to figure out why this happens and whether it is related to the reliability of this “giant”.

A bit of history:

The QX series first debuted on the market in 1996. In fact, it was the same Nissan Pathfinder of the second generation, but only with a slightly modified appearance and richer equipment. This model was a real SUV with impressive ground clearance, downshift and differential locks. Infiniti QX56 was introduced in 2004, unlike its predecessor, the body of the more expensive and high-quality Nissan Armada was taken as the basis for the development of this car. Despite this, the novelty was built on the same platform as the Nissan Titan pickup truck - F-Alpha. In general, the appearance of the car turned out to be more aggressive than the original. This result was achieved thanks to the impressive hood and chrome grille. The car was assembled only at Nissan's American plant in Mississippi. The main sales markets were the USA, Canada and some countries in the Middle East.

In the CIS, official sales of this model started not so long ago, in 2007, before that cars were imported to us by the so-called gray dealers. The premiere of the next generation of the Infiniti QX56 SUV took place in March 2010. Unlike the previous generation, the platform was borrowed from the 2011 Nissan Patrol Y62 for the development of the new product, and the assembly was moved from the USA to Japan. Despite current trends, the Japanese decided to keep the frame structure of the body, impressive dimensions and high quality finishing materials. In 2012, a SKD assembly of cars was launched at the Nissan plant in St. Petersburg, and already in 2013, the model was renamed Infiniti QX80 due to a change in the brand index system.

Weaknesses and shortcomings of the Infiniti QX56 with mileage

The paintwork on Japanese-made cars has never been known for its reference quality, and the QX is no exception. In addition, certain miscalculations in the creation of the front of the car do not contribute to the long service life of the paintwork, due to which the body begins to sandblast over time. Despite this, the body staunchly resists the onslaught of the red disease, due to which even the cars of the first years of production often do not even have a hint of rust. As for the problem areas of the body, there are few of them.

The most common ailment is fogging of the front optics, fortunately, the problem is solvable - additional sealing of the seams of the headlight unit is required. Another disadvantage is the frequent failure of the button responsible for opening the trunk window. The reason - the wiring becomes unusable. It is also worth noting the tendency to sour the mechanism for lowering the spare wheel. To avoid trouble at the most inopportune moment, it is necessary to periodically lower the spare tire and lubricate the mechanism. With the advent of frost, door handles may stop working due to freezing cables.

Power units

On the Infiniti QX56, only a 5.6-liter V8 gasoline engine with a capacity of 320 hp was installed, with a torque of 529 Nm. This motor is very reliable, but demanding on the quality of lubricants. If you pour anything into it, then serious problems with its performance and expensive repairs of the unit will not take long. The biggest drawback of this motor is unreliable chains in the timing system (thin), which tend to stretch. Some servicemen say that a chain from is used here. Manufacturers are well aware of this problem, so they have released reinforced chains that run for a relatively long time - 150-180 thousand km.

It is also worth noting the oil burner of the power unit, due to which it may additionally require up to 1 liter of oil per 1000 kilometers. The increased oil consumption of this model is a platform for disputes and discussions, since some motors eat oil only at high speeds and dynamic movement, while others are the other way around. In any case, this is not the norm and serves as a reason for diagnosing (first of all, you need to measure the compression in 7-8 cylinders - it should be at least 13.5 kg, the standard value is 15.5 kg).

Also, catalysts can be attributed to weaknesses, which are quickly destroyed when using low-quality fuel. The main symptoms indicating the need to urgently replace the catalysts will be: loss of traction, unstable engine operation, errors in lambda probes appear. This disease is exacerbated by the fact that when the catalyst is destroyed, its particles (ceramic dust) enter the cylinders, the lubrication system and damage them. If this happens, you will only have to buy a new engine, since no amount of flushing will completely remove such dust. To permanently solve the problem, it is necessary to replace the catalysts with flame arresters.

You can also note the unreliability of the injection pump, which requires replacement every 80-100 thousand km. The servicemen call the reason for the short pump resource insufficient cooling, due to the small amount of fuel in the gas tank and the use of low-quality gasoline, which clogs the fuel filter at the pump inlet. Symptoms - failures appear during sharp acceleration, which eventually develops into a decrease in power throughout the entire range of engine operation.

It is also worth noting the tendency of the motor to overheat, so it is necessary to monitor the condition of the cooling system and periodically clean the radiator under high pressure. It is not recommended to use Karcher-type systems for washing the radiator, as they are not effective. Electrical wiring under the hood is exposed to chemicals, because of this, its contacts oxidize over time, which leads to malfunctions of the engine control system. For cars of the first years of production, the electric fan of the air conditioner radiator is installed directly behind the radiator grille and is exposed to all winds, because of this, it can jam over time. This trouble can cause the wiring harness to burn out. To minimize the risks of various malfunctions of the unit, use only high-quality gasoline, original oil and do not delay car maintenance.

Transmission

Paired with the engine, only a 5-speed automatic transmission was installed. This unit is reliable, but the hoses of its cooling system often lose their tightness (flow at the junction of rubber with metal). Tightening with the replacement of hoses is not worth it, as this can cause early failure of the box. There are also complaints about the incorrect operation of the transfer mode selection switch (“buggy” due to the failure of the electronic servo drive). The transmission is afraid of overheating, so it is recommended to install an additional cooling radiator on cars that are often used in off-road mode or in regions with a warm climate.

Most of the Infiniti QX56 on our market are equipped with all-wheel drive, however, there are also mono-drive versions brought from the USA. In the all-wheel drive system, the weak point is the crosses of the front and rear driveshafts, they fail during active city driving - about once every two years. Symptoms - clicks (clatter) appear when switching the automatic transmission selector from "R" to "D". In the front axle, breakdowns are possible and more serious: the destruction of the gearbox, the twisting of the axle shaft (CV joint), as a rule, the right one and the left one falling out. Experts say that such troubles are often caused by abrupt starts in 4H and Auto modes with the wheels turned out. The cardan shafts are impressively thick, and are also made with interchangeable crosses, only the front crosses are only supplied complete with a shaft.

Chassis, steering and brakes Infiniti QX56 with mileage

Despite the fact that the suspension of the Infiniti QX56 is completely independent, one cannot call the car very comfortable - the suspension does not always smoothly work out even small bumps. But the handling here is at a high level, which cannot but rejoice, especially considering the weight (almost 2.5 tons) and the dimensions of the car. As for the reliability of the suspension, there are no serious complaints about it. Due to the high center of gravity, it is often necessary to change the rubber bands of the front stabilizer (every 20-30 thousand km), fortunately, they are inexpensive (about $ 5 for the original). Once every 100-120 thousand km, the front shock absorbers need to be replaced (about 150 USD), and closer to 150,000 km, the rear ones. On the same run, the wheel bearings also fail (they change as an assembly with the hub). If wheels of 20 diameters are installed on the car, the resource of wheel bearings will be significantly less.

Regularly, air bellows are installed on the rear axle, which do not allow shock absorbers to sag when heavily loaded. The weak point in the “pneuma” is the compressor, which suffers from the effects of moisture and reagents (oxidizes and wedges). The cost of a new compressor is unreasonably high (about 400 USD), therefore, many owners change it to a cheaper analogue. The steering system is reliable; the only thing that requires special attention here is the power steering hoses - it happens that they flow. The brakes also cannot be called problematic, however, on cars of the first years of production, they were quite unsuccessful - they quickly overheated and warped. After restyling in 2008, the manufacturer eliminated this problem by installing reinforced brakes, but they are not always enough to stop such a large car with confidence.

Salon

Salon Infiniti QX56 is striking in its size, but this is the beauty of these cars. As for the quality of finishing materials and sound insulation, they are at a high level. Among the shortcomings here, one can note the weak lateral support of the seats, because of this, while driving on rough roads, you have to constantly hold on, and this quickly tires. Infrequently, electrical equipment also annoys, here only the poor quality of the dashboard can be noted, besides, it constantly requires repair - the instrument lights go out. Some owners blame the appearance of "glitches" in the control unit of the multimedia system. In both cases, resoldering the board tracks is required to fix the problems. After 100,000 km of run, the heater motor starts to mope - a rattle (knock) appears after switching modes. The elimination of this trouble will cost 60-100 USD.

Outcome:

Despite the age of the Infiniti QX56 is still quite an interesting option to buy, which will pleasantly surprise you with its quality and comfort. Most of the problems inherent in this model are associated with poor quality or untimely service. If you think that this is not a killable car that does not require special attention, the consequences can be dire.

If you are the owner of this car model, please describe the problems that you had to face during the operation of the car. Perhaps it is your review that will help readers of our site when choosing a car.

Sincerely, editorial Autoavenue

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Common problems and illnesses Infiniti QX56 Z62
How problematic is Infiniti with mileage?

The first and main thing that is full of all the reviews of the owners is increased wear of timing chains. In fact, this problem is not related to any miscalculations of engineers in the engine, but is simply the result of the supply of defective chains to the manufacturer's factory.

This shortcoming is recognized by the Infiniti representative office as massive and a free replacement of timing chains is carried out under a recall campaign. In other words, defective fast-stretching timing chains on the QX56 are NOT a problem. You can find out if a certain Infiniti QX56 or QX80 is eligible for chain replacement by calling any Infiniti OD.

When inspecting the Infiniti QX56 before buying it using computer diagnostics, you need to find out the angles of the intake and exhaust camshafts under load and idle time - this will allow you to find out the degree of stretching of the timing chain and the need to replace it. It is also worth bothering to ask the seller (if he is the owner) about the documents for replacing the chain, if it was carried out. Without documents, there is no point in believing sellers, as well as believing outbids.

We emphasize that the replacement of timing chains at the Official Dealer is free of charge, you are not obliged to agree to the replacement of any other parts that the dealer “recommends” to be replaced. Usually, ODs try to lure customers into additional work to replace oil scraper rings and caps. In addition to the chains, there is a recall campaign to replace the rear control arms and fuel gauge on the QX56 and QX80.

Important! Only "racing" operation on a stretched chain leads to chain jumping and further internal damage.

The second widely discussed problem of the Infiniti Qx56 is the oil burner and oil starvation. There are a lot of unconfirmed and invented cases about this. First of all, it must be said that oil waste for VK56VD engines is the norm. The average oil consumption for 100 thousand kilometers of the real run of the Infiniti Qx56 car is 1-1.5 liters of oil per 10,000 km.

Because of what happens oil starvation QX56 Z62 (VK56VD)? Infiniti QX56 and QX80 do not have an electronic engine oil level control system, i.e. no electronic probe, therefore, it is not uncommon for owners or repurchases, riding before sale, to Infiniti QX56 with high mileage do not monitor the oil level and are not interested in it in principle. As a result, you can get scoring of the working surfaces of the cylinders or beds of the RV or liners of the CV.

Low oil level and/or constant aggressive operation leads to local engine overheating. Overheating is very unpleasant for this motor, because. in addition to standard troubles and increased wear, direct injection and catalysts suffer. To check for symptoms of an overheated engine before buying, you need a long test drive, as well as an inspection of the inside of the engine with an endoscope through the oil filler neck.

QX56/QX80 Z62 Catalyst Problems
Ceramic crumb in cylinders and badass

Does VK56VD pick up motors? Despite the alusil coating of the cylinder walls of the aluminum block head, this otherwise cast-iron engine has few cases of scuffing and is associated with high mileage and overheating, and not wear of the catalysts.

There are numerous reviews from Infiniti Qx56 owners with mileage indicating more frequent death of catalysts on this car than on the rest of the brand line. Considering that the material of the catalysts is identical, and the manufacturer has not changed, this situation may seem extremely strange.

In fact, everything is much simpler - the fact is that for engines VK56VD direct injection(QX56, QX80, M56, Q70S) a more advanced and smarter engine ECU is installed. Algorithms of the new ECU allow to determine the reduction in the efficiency of catalysts earlier, compared to older versions (for example, VK56DE for QX56 of the previous body, or all FX35 FX37).

As a result of the earlier triggering of the algorithm, the end users of the car think about the lower reliability of the catalysts, when in reality, on other cars, the self-diagnostic system is simply not aware of the state of the exhaust line elements.

In most cases, when an error occurs in the low efficiency of catalysts, there is no direct need to replace them or uproot them with flashing to euro2. It is necessary to dismantle the rollers and their visual assessment. It is usually sufficient to weld the mesh inside the catalyst by spot welding in place so that the catalyst does not have a degree of freedom inside the metal casing.

If your catalysts really began to break down or melted, you can’t just reflash to EURO2 to clear the error. Destroying catalysts must be cut out or replaced, otherwise the destruction of the upper catalysts may begin and subsequently the cylinders may be filled with ceramic dust.

Are the problems of the Infiniti QX56 with the engine and catalysts so terrible? Definitely not. Cases of destruction of the coating of cylinders due to destroyed catalysts - less than 0.5%. The main reason for the destruction of the alusil coating of VK56VD cylinders is oil starvation and overheating. Therefore, we do not recommend proactively cutting or changing anything.

Diagnostic Lab -

Car selection
premium segment in Moscow

If you want to ride by car, not study its potential Problems

Why worth contacting to us for a car check
before buying or car selection Full construction?

The car selection service from the Diagnostics Laboratory is not just a search for a car with a lower mileage or a body inspection with a thickness gauge: we perform the full range of necessary checks large and expensive to repair units, so that you do not do repairs in principle.

Infiniti Qx56 and Nissan Patrol do not like long exhausting off-road. Despite the presence of a frame and a lower gear, the razdatka of these cars overheats quite quickly during slippage. Be sure to check all off-road modes in a test drive. The absence of errors in the all-wheel drive system in this case does not mean anything.

What kind of suspension does the Infiniti QX56/QX80 have?
Understanding the vinaigrette of pneumatic and hydraulic suspension Z62

The Z62 platform has a very tricky hydropneumatic suspension. Let's start with the fact that pneuma is only on the Infiniti QX and is absent on the Nissan Patrol co-platform, it must also be emphasized that Infiniti pneuma is only on the rear axle.

Pneuma is inactive and serves only for the comfort of rear passengers and body level control. Cases of malfunction of pillows or the compressor are single. There is NO pneuma in front, and it is also impossible to increase or decrease the level of clearance manually.

The cost of the air suspension compressor for the Infiniti QX56 ranges from 25 to 50 thousand rubles, depending on the city and type of retail network. Rear axle air bellows run an average of 200 thousand km, but most often much longer. The reason for replacing them is usually the leakage of the fittings, as a result, the machine falls back during the night idle.

Infiniti QX56 / QX80 shock absorbers are not ordinary, but with hydraulic reservoirs connected to a common hydraulic circuit with pumps and two hydraulic accumulators. In fact, this system is an analogue of the ABC (Active Body Control) hydraulic suspension from Mercedes, with the only difference being that in Infiniti, the clearance is not regulated by pressure in the hydraulic struts, because. hydraulic struts are made a little differently.

The hydraulic suspension of the Z62 performs both the role of shock absorbers and stabilization of body rolls. In terms of changes in stiffness and clearance, the system is passive and does not have a range of changes / adjustments. The roll suppression mechanism, on the other hand, is also active when cornering, with a delay, but it tries to control roll and body roll. It is impossible to change the rigidity of the system, the system is not controlled by the driver.

Despite the technical complexity of the hydraulic suspension, Infiniti has practically no problems with the integrity of the hydraulic circuit, accumulators or pumps.

What is the difference between QX56 and QX80?

What is the difference between Infiniti QX56 and Nissan Patrol?

The main difference in technology lies in the different brake mechanisms and the different diameters of the brake and wheel discs.

The QX56 has floating calipers for a larger brake disc diameter than the Patrol, which has the stock Akebono brakes found on the FX37 and other cars.

Wheel disks on Infiniti QX56/QX80 were regularly installed only by R22.

The Nissan Patrol does not have rear passive air, but the hydraulic suspension is exactly the same.

Diagnostic Lab -

Car selection
premium segment in Moscow

If you want to ride by car, not study its potential Problems- contact our company, we will find you the most serviceable car. We have an excellent understanding of the problems of these vehicles and know how to detect wear due to the fact that we work only within the framework of our specialization and our own knowledge base.

Indeed, the engine of this Infiniti QX56 "troit" when idling. The check engine is on (Service Engine Soon), and, with an increase in speed, the check engine light sometimes starts blinking. The engine, of course, "does not spin up." The catalysts have been removed. Gasoline consumption, according to the client, has increased significantly. We “sin” for an alarm with auto start, but after checking this version, we dismiss it.

We connect Nissan Consult III + and an experienced diagnostician to solve the problem. Nothing saying error P0300, about numerous misfires in all cylinders. There are no more errors. We change the candles - nothing changes, still P0300 and the engine shakes at idle. We pay attention to the lean mixture in the engine - this parameter allows you to see the computer. We check the fuel pressure in the rail - everything is in tolerances. At the same time, the diagnosis of misfires on cylinders gives a strange result: in some cylinders everything is more or less normal 20-30 misfires, and in some 100 or more.

We connect the flushing of the fuel injectors and wash the injectors, as usual with chemistry. After chemistry, it doesn’t get better, but the picture changes. Those cylinders where there were few gaps earned better, in the rest the picture did not change.

Resolved: remove the fuel injectors for further diagnostics and repair. In the preliminary chambers everything was overgrown with soot:

As it turned out, the injectors were not removed in vain. Overgrown with soot, coked nozzle holes, even after cleaning the injector, they were not cleaned.

We consider cleaning nozzles in ultrasound dangerous for nozzles: in the process of cleaning, under the action of short waves, the seat is broken with a needle. After such cleaning, the nozzle can be thrown away in half the cases. And we had a case when the client was “friendly”, somewhere the nozzles were cleaned twice with ultrasound during normal maintenance (the mileage was 40 thousand km). After that, he barely got to us. The result is an injector replacement.

Therefore, we will clean the nozzles with chemistry. If it "takes" - it's lucky, if it doesn't "take" - we will change it. We put the nozzles in a bath with an infernal mixture of decoking for the engine, liquid for washing nozzles, add acetone. We leave for a day.

We do not wait until it is washed off, we want to check whether the matter is in the injectors. To do this, we borrow used, but obviously working nozzles from a friendly Infiniti dealer. We put them. We start - everything is perfect. So it really is the injectors.

A day later, the nozzles were not washed. Outwardly clean, in fact, they are clogged from the inside. No brushes, spells, compressed air help.

This is a macro shot of the nozzle:

The stand for washing and control of nozzles is not suitable. It is designed for conventional fuel injectors, and we are dealing with high pressure direct injection injectors. The pressure is completely different, and the control system is different. With it, we found a nozzle that was leaking. But here is another case.

We are trying to put the washed nozzles on the car. We start - everything is the same. The engine shakes, barely revving. We make a decision with the owner to replace the injectors with new ones.

Type of new nozzle:

The injectors have been replaced. The engine ran like clockwork.

Injectors are not the only problem for which the VK56VD engine may not work correctly. Our arsenal has experience in finding and eliminating other causes of uneven motor operation.

The key to success in repairing the unstable operation of the Infiniti QX56 (QX80) engine is, of course, diagnostics! Moreover, “I have already been diagnosed in another service” - the phrase is about nothing! Whether it is not enough what qualification at the diagnostician, what computer?

In diagnostics, in addition to equipment, which, of course, must be the most modern and appropriate for the brand of car, the first violin is played by the human factor! It is the specialist who decides what is important and what is not, where is the cause and where is the effect. He, not the computer, finds the problem.

In our technical center, traditionally strong diagnostics, we find what the owners suffer for more than one month, going around the services of Moscow and its environs.