Idle speed sensor Largus 8 valves where is it located

1. Disconnect the wire from the “negative” terminal of the battery.

3. Having released the latch, disconnect the wiring harness block from the idle speed control.

4. Using a Torx T-20 wrench, unscrew the two self-tapping screws securing the IAC to the throttle assembly.

For clarity, we show the operation on the removed intake pipeline.

5. Remove the idle speed control.

Note:

Before installing the regulator, clean the valve seat, air channel and the surface under the regulator's sealing ring in the throttle assembly.

The IAC connection is sealed to the throttle assembly with a rubber ring

6. Apply engine oil to the new regulator o-ring.

7. Install the idle speed control in the reverse order.

Possible configurations of Lada Largus

The question of choosing an internal combustion engine arises only for owners of the base model of the car. The happy owners of the updated Lada Largus Cross are not puzzled by this choice, as are those who are willing to pay for the Luxury package of their iron horse, where everything is included (including the most powerful modification of the power unit). The following engine can be installed on the domestic version of Reno Logan MCV:

Of course, bare numbers won’t tell you anything about the advantages of a particular power unit for those who prefer to be scrupulous when buying a car. After all, in terms of comfort, handling and prestige, outwardly it remains the same car. Therefore, in order to find out what a particular engine is capable of, it is worth assessing the technical characteristics of the car.

Damage to throttle valve O-rings

2 o-rings are responsible for the tightness of the throttle valve connection. One of them is located on the intake manifold side, the second on the air filter side.

Over time, the rubber rings dry out. The material loses volume and shape. Because of this, the system becomes leaky and air begins to enter it.

Idle speed can only be affected by the seal located on the intake manifold side. If the ring has dried out and lost volume, the revolutions will float. The second seal does not affect idle speed, but it also needs to be checked.

You can make the system sealed again in different ways:

  • Install new original seals.
  • Install non-original rubber rings of suitable size.
  • Wrap the throttle valve with fum tape and install the old seals.

We do not recommend installing non-original seals. Except when you are confident in the quality of the materials and the manufacturer.

Floating idle speed can be explained by other reasons. Therefore, it is better to entrust the repair to a specialist. He will check the condition of the car and make sure there are no other faults.

Source

Why do the revs fluctuate on the Lada Largus?

According to reviews, the problem with floating engine speeds is familiar to many Lada Largus owners. This is especially true in winter, when the car has difficulty starting when cold (starting the engine is difficult in the morning). In such situations, floating speeds only make the situation worse. The tachometer needle may jump chaotically from 1000 to 1500 rpm or not reach the “warm-up” level at all, staying below the required idle speed values. Experts do not recommend self-diagnosis of the car. If the cause of the problem is unknown, it is better to contact a service station.

Car engine modifications and their features

The reasons why the speed may fluctuate on Largus are due to differences in the technical characteristics of the engines. Depending on the configuration, an 8- or 16-valve engine is installed.

8-valve K7M 800

This engine model was borrowed from Renault Logan and Sandero. Such motors have been installed on Largus since 2010. The unit complies with the Euro-4 standard, its power is 83 hp. With. Among the disadvantages:

floating idle speed;

high fuel consumption;

lack of hydraulic compensators in the valve mechanism - the gaps need to be adjusted every 30,000 km; the need to replace the timing belt every 60,000 km - a broken belt will inevitably lead to bending of the valves; unreliability of crankshaft oil seals; vibration and increased noise during operation of the power unit.

The 8-valve engine is too weak for Largus. Among the advantages are the unpretentiousness of the engine and its inexpensive maintenance.

replacement for pxx largus.

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Damage to throttle valve O-rings

2 o-rings are responsible for the tightness of the throttle valve connection. One of them is located on the intake manifold side, the second on the air filter side.

Over time, the rubber rings dry out. The material loses volume and shape. Because of this, the system becomes leaky and air begins to enter it.

Idle speed can only be affected by the seal located on the intake manifold side. If the ring has dried out and lost volume, the revolutions will float. The second seal does not affect idle speed, but it also needs to be checked.

You can make the system sealed again in different ways:

  • Install new original seals.
  • Install non-original rubber rings of suitable size.
  • Wrap the throttle valve with fum tape and install the old seals.

We do not recommend installing non-original seals. Except when you are confident in the quality of the materials and the manufacturer.

Floating idle speed can be explained by other reasons. Therefore, it is better to entrust the repair to a specialist. He will check the condition of the car and make sure there are no other faults.

Sensor selection

Idle speed sensors for the Lada Priora car are produced by two factories, one of them is located in Kaluga, and the second is in Kostroma. It is difficult to say which one is better, since they are manufactured under approximately the same conditions. The main thing is not to purchase a fake instead of the original IAC, since no one guarantees its long-term operation. The best option would be to compare catalog numbers and purchase exactly the same sensor, since if the new IAC is not designed for a Priora with 16 valves, it will not work.

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Calibrating pxx in several ways

After installing a new sensor, as we wrote above, the speed may fluctuate again. To do this you need to calibrate. You can do this in two ways:

  1. Using a professional dealer diagnostic scanner
  2. Independently using the calibration algorithm embedded in the ECU

The first method involves contacting an official dealer, but we will describe the second in detail below.

After replacing the pxx sensor, we put the negative terminal of the battery back on. The old sensor's calibration data has been reset. Now we proceed as follows:

  • Turn on the ignition but do not start the engine for 5-10 seconds
  • We start the engine (the speed may jump or be increased)
  • We turn off the engine (at this moment the rod pxx occupies another extreme position)
  • We carry out the procedure several times
  • Next, start the engine and let it run for 3-5 minutes.

Calibration should be completed and the speed will “return” to normal

You can replace the pxx sensor and calibrate it yourself, without the help of specialists. We hope that our instructions will help you save money on car services.

Lada Largus 2013, engine Gasoline 1.6 liter., 105 hp, Front drive, Manual - DIY

Comments 26

Hello! I would like to ask if you have an electronic gas pedal?

cable car 2013.

The xx sensor can be cleaned every week, it will always be dirty...

Just cleaned it for the first time. The throttle valve was clean, oddly enough, much cleaner than after a run of about 10-15 thousand... now 32

The xx sensor can be cleaned every week, it will always be dirty...

I filmed it today. Just a little bit of dirt... I drove about 2-3 thousand...

You could not take it off, but clean it with a slipper... on the floor, it will wash itself ;)

so at the same time... At the same time I checked your statement...

1.) Disconnect the battery for 15-20 minutes (I disconnected it at night) 2.) Connect the battery. 3.) Turn on the ignition but do not start the engine, wait until the lights go out for another 10-15 seconds 4.) Turn off the ignition. 5.) Repeat points 3.) and 4.) three to five times. 6.) Turn on the ignition and start the engine.

I have known this algorithm since the time of 21114, although point 5.) was not in it. Just in case, I did it too. The algorithm reminded renby in the note Idle air control - IAC

By the way, this must be done if any sensor has been changed or touched/moved, unscrewed/tightened. The controller re-interrogates all sensors and remembers their zero values, i.e. retrained.

Today I finally did all the work on cleaning the XX sensor and cleaning the throttle body. I barely pushed this crap into the sensor... then I tried to do it according to the algorithm... still the speed is crazy. I removed the terminal and began to touch the battery with it until the sensor moved... then I started it... and everything became normal)

I surfed the Internet a little and added to the article Where is my engine assembled? OIL LEVEL IS NOT LOWER OR ABOVE THE REQUIRED LEVEL!

Excessive amount of oil in the engine leads to an increase in the amount of crankcase gases - this leads to coking of the throttle valve in the engine intake tract.

I have 5 mm below the upper limit of the ribbed surface of the probe.

this is just half a liter, I had this on both Largus from the factory

from the factory it was 5-7 mm above the upper limit) somewhere around 600-700ml... What is the correct level, there are several options. All because of these French... why can't we do min and max...

I read somewhere that our engines don’t like oil overflow, it was a long time ago, I don’t remember where, but in my opinion the source could be trusted, so I drained it right away

It’s clear that there must be the correct level, but how can we determine it on our dipstick? I believe that the ribbed surface is a level range. correct. Some people think that the line that is filled in at the factory is the correct level. It’s not for nothing that this line is there

I also believe that the ribbed surface is a level, the dashes are the imprint of the blank with which this ribbed surface is applied to the probe, i.e. weld, technological seam, etc. etc., in general they do not carry an information load

But there is a strange thing... everywhere they write that 4.7 or 4.8 (I don’t remember exactly) should fit into the engine, but for me it fit 4.3)))

Well, not everything is drained + the filter, on 2111 the norm was never filled either, no matter how hard I tried to drain it, there are apparently cavities where the oil remains

I read somewhere that our engines don’t like oil overflow, it was a long time ago, I don’t remember where, but in my opinion the source could be trusted, so I drained it right away

The car did not work for long after cleaning, it still works strangely. maybe that wasn't the reason. And it looks like some kind of video is making noise... although I could be wrong.

What is pxx, its functions and operating principle

Before we begin to describe the malfunctions and the process for eliminating them, it is worth saying a few words about the idle air regulator.

The pxx sensor is installed in the throttle body. With its help, the ECU (electronic engine control unit) regulates the engine's idle speed. The idle air valve regulates the crankshaft speed by metering air flow through a bypass channel parallel to the throttle valve.

When the engine is warmed up to operating temperature, the computer supports the operation of the sensor. If the engine is cold, the ECU uses pulses to control the operation of the sensor and increases the speed to warm up. Gradually the speed decreases as it warms up.

Oxygen sensor for Lada Largus: original, analogues, price, catalog numbers

Catalog article/markingPrice in rubles
Control 8200052063 (8 and 16 valves)From 1600-1800
Diagnostic 8201071311 (8 and 16 valves)From 1600-1800
NGK 95801From 1400-1500
BOSCH 0 258 006537From 1400-1500
ERA 570023From 1400-1500
FENOX SD10100O7From 1400-1500
BREMI 30223From 1400-1500
DENSO DOX-0150From 1400-1500
STELLOX 20-00028-SXFrom 1400-1500
PATRON HZ-30301006From 1400-1500
*prices are as of May 2022

The lambda probe (LPS) monitors the oxygen content in the exhaust gases. The excess of air in the mixture is called “enrichment”, and the reverse process is called “depletion”.

Both factors negatively affect the functionality of the motor. This leads to decreased power, unstable idling, and increased fuel consumption.

In order to save money, many car owners purchase low-quality spare parts, which accelerates premature wear of the equipment.

Symptoms of a faulty pxx sensor

If you notice one or more of the following symptoms, you will most likely need to replace the idle speed sensor.

  • Unstable engine speed at idle
  • engine stalls when shifting gears
  • When the engine warms up, the speed does not increase
  • reduction in engine speed under load (turning on headlights, heater, etc.)+
  • Unstable engine speed at idle when the engine is warm
  • Floating engine speed

It is also worth noting that when installing a new sensor, the speed may also “float”. The reason for this is the lack of calibration of the new sensor. Simply put, the computer does not see the new sensor, so it is necessary to carry out calibration, which we will write about below.

How the sensor works on a modern injection Renault Logan

When the throttle valve is closed (the accelerator pedal is released), theoretically no air enters the intake manifold. In fact, this is not true. The damper itself has calibrated holes or a gap that will prevent a vacuum from being created. Otherwise, damage to the intake tract or cylinder head gaskets may occur. This happens because during the intake stroke the pistons intensively suck in air, and the tightness of the cylinder head is sufficient to create a powerful vacuum force.

But the holes in the throttle valve are not enough to form a fuel-air mixture. An additional channel is required to allow air to bypass the throttle assembly. This is the main function of the idle speed sensor (IAC).

A simplified diagram of the operation of the Logan idle speed control sensor is shown in the illustration below.

Based on the diagram, it can be seen that when the throttle valve is closed, the air flow from the filter into the intake manifold can pass through the bypass channel of the idle air regulator.

In addition, when starting the engine, this workaround helps normal operation even when the accelerator pedal is not depressed. When the car is stopped with the engine running, the power plant continues to operate in normal idle mode, that is, even speed is maintained.

Causes and methods of eliminating difficult engine starting

To successfully start the engine, the fuel mixture and a spark from the spark plugs must simultaneously appear in its cylinders.

If floating idle speeds have become too annoying, and it is no longer useful to turn the engine with the starter, it’s time to understand the causes of the malfunctions that have arisen. The table shows the most common reasons why the Lada Largus engine speed fluctuates and it may not start.

CauseDiagnosis and manifestations

Remedy

You should not randomly change all the parts without first checking their functionality. Comprehensive diagnostics are necessary, since there can be several sources of malfunction at once. Modern cars of the VAZ family are equipped with the same type of engines. For this reason, the solution to the problem will be virtually the same for different cars.

Idle air regulator Lada Largus general description

The idle speed regulator of the Lada Largus maintains a given engine idle speed with the throttle valve fully closed during its start-up, warming up and when the load changes when auxiliary equipment is turned on. The regulator changes the amount of additional air supplied to the intake system in addition to the throttle body, and is an electromechanical valve attached with two bolts to the throttle body flange. The regulator valve seat and channels made in the throttle assembly flange form a system for supplying additional air, bypassing the throttle valve. The engine control unit, having processed signals from the sensors, determines the need to open valve 1 (Fig. 1) of the regulator and transmits pulses to plug terminal 5 of winding 3 of the regulator stator. With each control pulse, the rotor 8 rotates at a certain angle, moving the valve 1 relative to the seat using the lead screw 4. Additional air enters the inlet pipe through the channels in the throttle assembly. By determining the vacuum in the engine intake pipe, the control unit strives to maintain it at a given level by periodically opening and closing the idle air control valve. This makes it possible to supply a constant amount of additional air to maintain a constant idle speed. By changing the amount of opening and closing of the regulator valve, the control unit compensates for a significant increase or decrease in the amount of supplied air caused by its suction through a leaky intake system or, conversely, by a clogged air filter. The inclusion of additional units causes an increase in engine load, accompanied by a decrease in idle speed and a change in vacuum in the intake pipe, which is also compensated by the control unit using a regulator.

Rice. 1. Idle speed regulator Lada Largus: 1 - valve; 2 — regulator body; 3 - stator winding; 4 — lead screw; 5 — plug terminal of the stator winding; 6 — ball bearing; 7 — stator winding housing; 8 - rotor; 9 - spring

About the domestic VAZ 11189 engine

In April 2022, AvtoVAZ began installing domestic VAZ 11189 engines on Largus. The advantages of this engine are described in one of the issues of “Okay Mechanics”.

Some measurement results Autoreview
OptionsCars
Lada Largus (VAZ engine)Lada Largus (Renault engine)
Maximum speed, km/h157,1/156,7*168,0/167,6
Acceleration time, s0—50 km/h4,3/4,83,9/4,4
0—100 km/h13,9/16,812,5/14,5
0—150 km/h61,1/71,638,9/43,7
on the way 400 m19,3/20,218,4/19,4
on the way 1000 m36,1/37,834,1/36,0
60-100 km/h (III)8,7/10,69,3/10,6
60-100 km/h (IV)12,1/15,112,8/14,1
80-120 km/h (V)19,3/24,022,1/23,4
* Partial load/full load
Engine characteristics
OptionsVAZ-11189Renault K4M
Volume, cm 315961598
Number of valves816
Maximum power, hp/kW/rpm87/64/5100102/75/5750
Maximum torque, Nm/rpm140/3800145/3750
Cylinder diameter/piston stroke, mm82,0/ 75,679,5/80,5
Compression ratio10,3:19,8:1
Injection typedistributed, electronically controlled
Octane number of gasolineat least 92not less than 95

Let us remind you that you can read about the VAZ 21129 engine here.

Key words: Lada Largus engine

AvtoVAZ several years ago set out to create a good car. A kind of workhorse for the people. Even then, the work of the VAZ-Renault alliance was in full swing. Largus is a direct reflection of teamwork. They developed a car based on Logan. The platform is so successful that the Duster crossover, Sandero hatchback and many Nissan car models are produced on it.

Elimination of floating engine speed at idle - logbook Lada Largus 2012 on DRIVE2

Almost all Largus drivers are aware of the problem of floating idle speed, which manifests itself when the internal combustion engine is not warmed up. The cause of the problem and its solution have long been known to many. The reason is a dried out throttle valve sealing ring, which begins to leak air. The solution is to replace this ring. Someone changes this ring to a thicker one and forgets about this problem forever (and this is most likely the most correct thing). Due to the lack or lack of free time, it is easier for me to order a new original ring and replace it. From my own practice, I found that a new ring is enough for about 50,000 km. Then the problem appears again. But since the cost of this ring is not high, and replacement takes about 15 minutes (the main thing is that the engine is cool so as not to get burned), for me personally it is not difficult to change this ring once every 50,000 km, i.e. approximately once every 2-2.5 years. Moreover, it is still recommended to periodically wash the throttle valve. This is what I did the other day when the mileage approached 100,000 km. According to the replacement method, everything has been described for a long time, so I will limit myself to only photos:

Unscrewed everything necessary and removed the throttle

Photo of the removed throttle

The photo shows the same ring on the throttle

Article number of the replaced ring. It’s hard to see the article number in the photo - 8200068566

In principle, after 50,000 km the throttle was not very dirty. I washed it with brake cleaner, replaced the ring and put everything back together. Now you can safely drive another 50,000 km.

Part numbers used:

Throttle valve sealing ring: article - 8200068566, price - 106 rubles.

Thanks to all. Everything described above is purely my personal opinion and I am not trying to impose it on anyone. But if this information is useful to someone, I WILL BE GLAD!

Price: 106 ₽ Mileage: 100,000 km

Technical characteristics of Lada Largus depending on the number of internal combustion engine valves

To get closer to the specifics, let's look at the technical characteristics of the Lada Largus declared by AvtoVAZ using the example of a specific model, depending on the choice of power unit (five-seat station wagon). Perhaps the motorist will also be interested in how the Largus engine with 8 and 16 valves is fundamentally different, which we will discuss in the next section of the article. As for the topic that concerns us, depending on which engine is installed in the Lada Largus, the following defining parameters of the car change:

  • fuel consumption in a particular operating cycle;
  • dynamic driving characteristics;
  • torque that the engine can develop.

Naturally, the 8-valve engine in Largus will be considered less advanced, having slightly lower efficiency. Hence, higher fuel consumption is expected. However, the engineers who developed the heart of our iron horse managed to reduce this difference to an insignificant figure. The difference between the two power units is only 0.5 L per 100 km. in the urban driving cycle (10.6 liters versus 10.1). In the suburban operating cycle, the difference in fuel consumption practically approaches zero.

Differences in the dynamic performance of the Lada Largus are also noticeable. This applies, in particular, to the time it takes a car to accelerate to 100 km and maximum speed. The 8-valve engine, due to its lower power, will stop at 156 km/h, and the 16-valve engine is capable of accelerating the Largus to a speed of 165 km/h.

All of the above are perhaps minor details. The difference in the dynamic characteristics of the Lada Largus is already more noticeable when it comes to acceleration speed. 14.5 seconds versus 13.1. And this, in turn, is already determined by the lower torque. Otherwise, including reliability and fuel type, both power units are no different.

The fundamental difference between engines with 8 and 16 valves

AvtoVAZ began a good tradition of producing cars with internal combustion engines with different numbers of valves back from the “ten”, where it was possible to install a 16-valve head on the engine even independently, and Largus was no exception. The production technology of an 8-valve power unit is simpler and was developed by the Lada automaker back in the 80s. The production of an engine with 16 valves is considered more modern and complex, which is why the price is higher.

The simplest power unit of the Lada Largus, with a total of 8 valves, has only two valves per cylinder, this is easy to check thanks to simple mathematics. In this case, there is no separated intake and exhaust system and there is no effective gas exchange. This affects engine efficiency and fuel consumption.

In earlier models of cars from AvtoVAZ, the difference between internal combustion engines depending on the number of valves was more significant. When choosing an engine for the Lada Largus, you will not have to sacrifice significant fuel consumption or lower environmental standards of the car. Although the difference in the technical characteristics of the internal combustion engine is still noticeable, the determining factor for Lada Largus drivers is still the price, because by buying a horse with an 8-valve power unit, you can save quite a lot.

Don't forget that the R-90 line of cars is produced on AvtoVAZ's modern B0 conveyor line and meets European quality standards. Therefore, regardless of whether the Lada Largus has a 16 valve engine under the hood or not, the comfort and control of the car remain the same. Whether it’s worth paying extra for higher dynamic characteristics is up to you to decide.

In the repair of modern cars, computer diagnostics are increasingly needed. Such diagnostics allows you to identify malfunctions in the engine control system, ignition system, fuel system, and additional systems, for example: ABS, EPS (electric power steering), air conditioning, etc.

Also, based on the results of computer diagnostics, it is sometimes possible to indirectly determine the condition of the cylinder-piston group.

If any of the malfunctions described below appear on your car, you may need to first perform a complete diagnosis of the engine management system.

Unstable engine operation at idle

· The engine does not develop power (the engine does not pull)

· Increased fuel consumption (high gasoline consumption)

The engine does not start or starts and stalls

Computer diagnostics allows you to check the functionality of various engine sensors (crankshaft or camshaft position sensor, mass air flow sensor, speed sensor, oxygen sensor (lambda probe), idle speed control, throttle position sensor and other sensors responsible for the correct operation of the engine.

Idle air regulator with cover 16V 8200692605 for VAZ Largus

Dear customers, in order to avoid errors when sending the electronic idle speed regulator 8200692605, in the “Comment” line, indicate the number of valves and engine size, your car model, modification KS015, KSOY5 (5-seater station wagon), RS015, RSOY5 (7-seater station wagon). mi local), FS015, FSOY5 (van).

The K4M engine is a gasoline, four-stroke, four-cylinder, in-line, sixteen-valve, with two overhead camshafts. The operating order of the cylinders is: 1–3–4–2, counting from the flywheel. Power supply system – distributed fuel injection (emission standards Euro 4).

When the K4M (16V) engine is idling (the throttle valve is closed), the electronic engine control unit (ECM) 8201264001 RENAULT controls the air supply using the idle air regulator IAC 8200692605.

Air from the air filter housing 1, having passed through the IAC 2, is supplied through a rubber hose 4 to pipe 5 of the oil separator housing and from there, through the air channel in the oil separator housing, enters the receiver 3.

Electronic idle speed regulator 8200692605 (IAC) Lada Largus is mounted on the air filter housing. IAC is a stepper motor with a micrometric screw (valve). The valve shut-off element (needle) changes the flow area of ​​the channel and provides regulation of air flow bypassing the throttle valve.

To increase the crankshaft rotation speed at idle, the ECM sends a control signal to open the valve, increasing the air supply bypassing the throttle valve, and, conversely, to reduce the rotation speed, a command is sent to close the valve. When braking the engine, the throttle valve closes sharply, and the IAC increases the air supply bypassing the throttle valve, resulting in a leaner fuel mixture. This helps reduce emissions of hydrocarbons and carbon monoxide into the atmosphere.

The idle air control is non-separable and must be replaced if it fails.

Other article numbers of the product and its analogues in catalogues: 8200692605.

Lada Largus (4601), RENAULT Logan, Sandero, Duster.

How to independently replace the electronic idle speed control with a cover in a car of the Lada Largus K4M (16V) family.

With the online store Discounter AvtoAzbuka, repair costs will be minimal.

Just COMPARE and BE SURE!!!

Don't forget to share the information you find with your friends and acquaintances, as they may also need it - just click one of the social networking buttons below.

Reasons why a diesel engine stalls immediately after starting

fuel problem

The first thing a diesel owner should worry about if the engine immediately stalls after starting is the fuel level in the tank, as well as its fluidity. If the fuel in the tank is “at the bottom”, the engine will probably start on the remaining fuel in the line - but will not continue to work. The same applies to fuel freezing: paraffin clogs the fuel filter, and fuel stops flowing into the cylinder. Having exhausted the remaining fuel in the system, the engine stalls.

Or water got into the diesel fuel - condensation from the walls of the tank. In this case, it will also not be possible to prepare a mixture rich enough for stable operation of the engine.

To avoid such a problem, in winter you need to keep the tank as full as possible and choose a high-quality winter diesel fuel.

fuel line problem

If air gets into the fuel lines, due to the resulting plug, fuel will not be able to flow uninterruptedly into the cylinders.

A clogged fuel filter reduces the capacity of the fuel lines; as a result, the cylinders do not receive as much fuel as is necessary for normal diesel operation.

To prevent this problem, owners of diesel cars need to change the fuel filter before the onset of cold weather.

battery problem

One of the conditions for confident starting of modern diesel engines in cold weather is sufficient starting current from the battery during startup and powerful electrical support after. Energy-intensive systems such as a fuel pump, for example, require a sufficient battery charge level.

But in cold weather this is a problem. If a working starter has difficulty cranking the engine, this indicates that the battery is significantly discharged.

The solution is to charge the battery from a charger or at a service center, and replace the old tired battery with a new one.

problem with sensors

The idle speed regulator (sensor), IAC, supplies the required amount of air to the engine when it is not running under load and the throttle valve is closed. Thus, it regulates the stability of the internal combustion engine at idle. It also changes the engine idle speed depending on the degree of engine warming up: on a cold engine they are higher.

The amount of air that passes through the IAC is determined by the mass air flow sensor (MAF). The readings of the crankshaft position sensor (CPS), which determines engine speed depending on the load, also play a role.

Accordingly, if the IAC, DPKV and mass air flow sensors are faulty, the engine may start, but then stall due to incorrectly transmitted data to the ECU and errors in mixture preparation.

At the same time, in case of problems with the IAC, the “Check Engine” lamp does not light up, but a malfunction of the TPS throttle position sensor is accompanied by a “check” signal.

In this case, you need to go for diagnostics and check the engine ECU for errors.

Location of the idle speed sensor on the Lada Granta

The Lada Granta with an electronic pedal does not have an idle speed sensor! That's why they sent you from the store to remove yours. There is only one idle speed sensor, you can’t go wrong if you have one, of course.

This is what the electronic pedal looks like

Finding out which pedal you have is easy. If you have a throttle cable under the hood, then you have a regular pedal. So, if you do not have an electronic pedal, then the sensor is located on the throttle valve assembly, or rather in its lower part.

Throttle assembly without idle speed control (electronic gas pedal)

To remove it, you must:

  1. remove power from the battery;
  2. remove the power supply from the idle speed sensor;
  3. unscrew the two fastening bolts;
  4. remove the idle speed sensor.

In the picture the idle speed sensor is indicated in red, the throttle assembly has also been removed

We diagnose the breakdown

There can be many reasons for a situation where the engine of a Lada Granta starts and immediately stalls. And this is not necessarily the idle speed sensor.

In my experience, I can say that you can still drive an 8-valve Granta with a breakdown of this sensor, since the engine is a “tractor” one. But 16-valve engines will stall, since these are high-revving engines. Therefore, if your 8-valve valve stalls, the reason may not be a breakdown of the idle speed sensor. But if it’s a 16-valve engine, then the symptoms you described are correct. By the way, Lada Prioras behave the same way, they have the same 16-valve valve.

Largus 16 valve revs float

According to reviews, the problem with floating engine speeds is familiar to many Lada Largus owners. This is especially true in winter, when the car has difficulty starting when cold (starting the engine is difficult in the morning). In such situations, floating speeds only make the situation worse.

The tachometer needle may jump chaotically from 1000 to 1500 rpm or not reach the “warm-up” level at all, staying below the required idle speed values. Experts do not recommend self-diagnosis of the car.

If the cause of the problem is unknown, it is better to contact a service station.

Car engine modifications and their features

The reasons why the speed may fluctuate on Largus are due to differences in the technical characteristics of the engines. Depending on the configuration, an 8- or 16-valve engine is installed.

8-valve K7M 800

This engine model was borrowed from Renault Logan and Sandero. Such motors have been installed on Largus since 2010. The unit complies with the Euro-4 standard, its power is 83 hp. With. Among the disadvantages:

  • floating idle speed;
  • high fuel consumption;
  • lack of hydraulic compensators in the valve mechanism - the gaps need to be adjusted every 30,000 km;
  • the need to replace the timing belt every 60,000 km - a broken belt will inevitably lead to bending of the valves;
  • unreliability of crankshaft oil seals;
  • vibration and increased noise during operation of the power unit.

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The 8-valve engine is too weak for Largus. Among the advantages are the unpretentiousness of the engine and its inexpensive maintenance.

16-valve K4M

This engine is used only in the top modifications of Largus in the “Lux” configuration. Engine power is 106 hp. s, but it still requires improvements. It differs from the previous unit:

  • absence of vibration and almost complete absence of noise;
  • low fuel consumption.

The disadvantage of the 16-valve engine can be considered its complex design, which leads to the high cost of the car. The engine life is about 450,000 km, but servicing the unit is more expensive. The main thing is not to use it often under increased loads and undergo maintenance on time.

Causes and methods of eliminating difficult engine starting

To successfully start the engine, the fuel mixture and a spark from the spark plugs must simultaneously appear in its cylinders.

The engine cannot be started if one or more elements are faulty. This happens, for example, when the starter does not spin the crankshaft.

If floating idle speeds have become too annoying, and it is no longer useful to turn the engine with the starter, it’s time to understand the causes of the malfunctions that have arisen. The table shows the most common reasons why the Lada Largus engine speed fluctuates and it may not start.

CauseDiagnosis and manifestations

Remedy

Regular and timely maintenance of the car will minimize or completely eliminate possible problems with starting the Lada Largus engine.

You should not randomly change all the parts without first checking their functionality. Comprehensive diagnostics are necessary, since there can be several sources of malfunction at once. Modern cars of the VAZ family are equipped with the same type of engines. For this reason, the solution to the problem will be virtually the same for different cars.

“Sores” that await every Lada Largus owner

Lada Largus is a popular car that has European roots and a French engine. For the first time, when this car appeared on the modern market, many were skeptical about it. However, high reliability characteristics and performance indicators have led many car enthusiasts to purchase this modern car. Despite the wide range of advantages, the car is still not insured against malfunctions, like any vehicle. Experts, having conducted various statistical and analytical studies, have identified the most common faults of the Lada Largus, which are discussed below.

Basic faults

It is important to note that highly qualified service center professionals claim that most Lada Largus car owners do not undergo the necessary diagnostic examination of the car after a certain mileage of operation. This leads to failure of various units and failure of the vehicle to move at all. Therefore, in order to prevent the occurrence of various malfunctions, it is recommended to undergo vehicle maintenance in accordance with operating conditions. Only in this way can the occurrence of the most common faults be minimized.

Malfunctions of the LADA Largus car concern various systems and components, but experts consider the following to be the most common:

Engine malfunctions

As you know, the car’s engine was made by a French company, but many car owners noticed that the unit does not tolerate high levels of lubricant. That is why, for optimal engine operation, it is recommended to pay close attention to the oil level. Checking this criterion is extremely simple: just look at the mark located on the dipstick. If there is an excess of lubricant, the oil seals fail, as a result of which they must be replaced in a short time due to the fact that the wear of the power unit increases. Owners of Lada Largus recommend that the oil level not exceed the upper mark on the dipstick. It's better to have it a little less.

"Floating" speed

Various problems are repeatedly caused by floating speed that occurs when the car is idling. Often such a malfunction is clearly visible when downshifting or switching to neutral. To solve this problem, it is enough to replace the o-rings with high-quality analogues. Thus, you can quickly and permanently get rid of floating speed when the engine is cold.

Idle air regulator Lada Largus general description

The idle speed regulator of the Lada Largus maintains a given engine idle speed with the throttle valve fully closed during its start-up, warming up and when the load changes when auxiliary equipment is turned on. The regulator changes the amount of additional air supplied to the intake system in addition to the throttle body, and is an electromechanical valve attached with two bolts to the throttle body flange. The regulator valve seat and channels made in the throttle assembly flange form a system for supplying additional air, bypassing the throttle valve. The engine control unit, having processed signals from the sensors, determines the need to open valve 1 (Fig. 1) of the regulator and transmits pulses to plug terminal 5 of winding 3 of the regulator stator. With each control pulse, the rotor 8 rotates at a certain angle, moving the valve 1 relative to the seat using the lead screw 4. Additional air enters the inlet pipe through the channels in the throttle assembly. By determining the vacuum in the engine intake pipe, the control unit strives to maintain it at a given level by periodically opening and closing the idle air control valve. This makes it possible to supply a constant amount of additional air to maintain a constant idle speed. By changing the amount of opening and closing of the regulator valve, the control unit compensates for a significant increase or decrease in the amount of supplied air caused by its suction through a leaky intake system or, conversely, by a clogged air filter. The inclusion of additional units causes an increase in engine load, accompanied by a decrease in idle speed and a change in vacuum in the intake pipe, which is also compensated by the control unit using a regulator.

Rice. 1. Idle speed regulator Lada Largus: 1 - valve; 2 — regulator body; 3 - stator winding; 4 — lead screw; 5 — plug terminal of the stator winding; 6 — ball bearing; 7 — stator winding housing; 8 - rotor; 9 - spring

Operations for removing the idle air regulator from Lada Largus

You will need a TORX T20 key

To replace the idle speed control of the K7M engine, perform the following operations. 1. Remove the air filter housing. Replace a damaged or lost elasticity ring with a new one. 2. Disconnect (with the ignition off) the wiring harness block from the IAC.

3. Remove the two screws securing the IAC to the throttle assembly (for clarity, shown on the removed throttle assembly).

4. Remove the IAC...

5. ...and its O-ring. Replace a damaged or lost elasticity ring with a new one.

6. Install the idle air control in the reverse order of removal.

To replace the idle speed control of the K4M engine, perform the following operations.

1. Disconnect (with the ignition off) the wiring harness block from the IAC.

2. Remove the two screws securing the IAC to the housing...

3. ...and remove the IAC

4. Remove the O-ring from the IAC. Replace a damaged or lost elasticity ring with a new one.

5. Install the idle speed control in the reverse order of removal.

Idle speed sensor Largus 8 valves where is it located

1. Disconnect the wire from the “negative” terminal of the battery.

3. Having released the latch, disconnect the wiring harness block from the idle speed control.

4. Using a Torx T-20 wrench, unscrew the two self-tapping screws securing the IAC to the throttle assembly.

For clarity, we show the operation on the removed intake pipeline.

5. Remove the idle speed control.

Before installing the regulator, clean the valve seat, air channel and the surface under the regulator's sealing ring in the throttle assembly.

The IAC connection is sealed to the throttle assembly with a rubber ring

6. Apply engine oil to the new regulator o-ring.

7. Install the idle speed control in the reverse order.

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