High idle speed of Chevrolet Niva engine

The standard Chevrolet Niva idle air control is an electromechanical module with a stepper motor and an adjustable shut-off valve. On Shniva, the model looks like a plastic, round cylinder with a terminal for electrical contacts. The device is mounted on the carburetor or throttle valve, where it regulates the low speed. The factory-installed stock model has a mushroom-shaped plastic shut-off valve. During the installation of a gas installation, some users install a DHC with a metal tip. The reinforced part is characterized by increased durability and resistance to aggressive environments.

Where is the idle speed sensor of the Chevrolet Niva

Regardless of the modification of the engine and its attachments, the sensor is always on the throttle. The device has a separate output with sockets for screws, where the assembly is located.

The top photo shows the throttle. Viewed from the proposed angle, the device is practically invisible. A more detailed picture shows the module itself.

Principle of operation

The mechanism of action of the device is the sequential execution of a standard program. The entire triggering process can be considered step by step. It will be easier to build a situation when the engine is running, warmed up and fully operational.

1. The driver releases the gas pedal while driving.
2. The next stage is the closing of the throttle channel, the flow of air into the engine stops.
3. This is where the sensor comes into play. The on-board computer sends a signal to the stepper motor (a total of 255 pulses can be sent, each one moves the valve a certain distance).
4. Using the DPKV, the on-board computer determines the number of engine revolutions and, if necessary, opens or closes the passage hole.

Please note that the device does not have feedback from the ECU. In the body of the part there are only two pairs of contacts responsible for moving the rod and its positioning in space.

Floating speed on UAZ Patriot. Main reasons

Good day to all Patriot fans and those who are interested in the unique and truly popular car UAZ Patriot. You can talk about the merits of the UAZ Patriot for hours and post a bunch of material, which we do periodically. But let’s not forget that the UAZ Patriot, although an excellent idea from the developers, has a number of problems unique to this car, popularly called “childish”. We will talk about one of them today. The topic of today's article is “ floating speed on the UAZ Patriot ”. Surely many Patriot drivers have encountered the fact that when warming up and not only, after starting the engine, the tachometer needle can jump from 800 to 1500 rpm. At the same time, you get the feeling that someone other than you is playing with the gas pedal and, in addition, an unpleasant vibration appears. This problem on UAZ Patriot is not rare, but it can be fixed. And as one scientist said: “Where did the dog rummage?”

Let us give a number of reasons why the speed on the UAZ Patriot fluctuates. This phenomenon occurs most often due to excessive suction of exogenous (coming from outside) air into the engine system. It comes first on the list of possible causes. Let's look at and describe it in more detail. The electronic control unit decides on the amount of air supplied to the cylinders, then the valves open. At the moment of suction, unaccounted air enters and the sensors provide information to the electronic control unit about the excess of the latter. Next, the temperature sensor sends information that the engine is warmed up and requires less fuel mixture. It is at this time that floating idle speed occurs. Meanwhile, the electronic system does not know where to direct the excess air and a “sausage” occurs. This reason is not the only one and a malfunction of the valve cover can also lead to floating speed.

It is impossible not to mention a couple of other reasons, one of which lies in malfunctions of the idle speed sensor or the air mixture mass flow regulator. These systems are worth checking or simply replacing the faulty sensor. The cost of such replacements will be low. After replacement, you need to analyze the replaced parts and if the speed continues to go crazy, then you need to look for the reason in the other systems described above. In very rare cases, the cause may be found in the spark plugs , namely in their blockage or improper operation.

Now, knowing where to look and where to look, you can quite quickly deal with such a common phenomenon as floating speed on the UAZ Patriot . Good luck to everyone, no problem!

Read even more useful articles in our channel on Yandex.Zen at the link https://zen.yandex.ru/media/id/5d557c5835ca3100ae8f6409/plavaiuscie-oboroty-na-uaz-patriot-osnovnye-prichiny-5d569702fe289100ac82db5c

Idle speed controller on Shnivy: causes of malfunctions

The device is a specific relay of a special design. The problems may be similar. Usually a part fails due to factors.

1. Natural wear and tear. With prolonged use, the mechanism can wear out - the spring weakens, the valve head wears out. It is also possible that the sealing gasket or sealant may crack.
2. Mechanical damage. Typically, such problems arise after careless repairs or careless maintenance of the car. The body of the part is plastic and is not designed to withstand shock, severe vibration or shaking.
3. Electrical damage. Motorists turn to mechanics with the problem of chafing or damaged wiring. The breakdown is quickly repaired and the car is ready to drive again.
4. Software failure of electrical equipment. ECU problems and software errors are included in a separate category. Such problems can only be diagnosed by a scanner and can be eliminated exclusively at the software level.

The engine idles unevenly: reasons - Auto Service

• Hi all
• It all started in the spring, uneven engine operation at XX, I began to look for the cause on my own, changed different Bosch, Denso and Russian spark plugs, the result did not change, all the spark plugs seemed to be working evenly.

Bosch spark plugs have been on for the last 3 thousand.

1. I filmed a short video before identifying the cause; at 13 seconds you can hear the revolutions floating.
2. .

I measured the gas pressure in the main line, evacuated the intake with corrugation, everything is fine, the pressure then drops to 3.8, at idle the pressure is in the range of 3.5-3.6, it doesn’t jump, there’s no air sucking in anywhere. I went and checked the ECU computer and removed everything is normal, checked and I removed the timing belt, ... in general I gave up and decided to wait for the breakdown to manifest itself., and not even half a year had passed_)))))

At the moment, most of the car is in the garage and under a canopy, I try to take the car for a spin once a week, they correctly say that the car should not be parked, the car should be working, any problem occurs due to oxidation, and here I have those.

inspection in December, but since I won’t drive in winter, I decided to drive it and do it in November while the roads are dry. I go to VOAD (Vostochka) to the top on a warm engine, driving slowly 160 +- 5 km/h and not reaching the upper chambers The motor begins to trot ... ((((((((((((((((((((((((((((((((((after the refueling was the first, gasoline! But it is not.

, I stop on the side of the road, the check light does not light up, which means two things: gasoline or a spark.

, I remove the spark plugs and see that the upper part of the spark plug in the contact area is oxidized and rusty... it’s strange, but as luck would have it, I didn’t have a tool with me to unscrew the spark plug, I had a screwdriver, I scraped it a little and did the same in the spark plug stick so that there was at least a little contact, the machine started working and I got to those.

inspection, there I removed all the wires and all the spark plugs, everything was clearly visible in the sun, in general I found the reason for the uneven idle! The wire in the first candle holder from the factory was not seated all the way, that is, by two cm. The contact clamp did not reach the spark plug, who would have thought, sometimes I screwed up, but everything worked for all 10 thousand km. Fine ))),

Removed the wires

I tore off the rubber band to plant it deeper and get home

But the gum burned well.

Everything is fine on this wire, the length of the rubber band coincides with the length of the candle

But here everything is bad, the wire is deep, burnt and rusted, the rubber band is not yet on, and I bent the clamp to get home, and all this time I was punching at XX, and the reason for the uneven XX.

Unscrewed the spark plugs

Filmed by Bosch

Screwed in the TTs that were purchased earlier

I thought for a long time about wires, and decided not to bother with expensive ones, they have already let me down)))))

Well, now I’m already educated, I checked all the wires twice)))))

Started it up and warmed it up...

In general, everything is fine XX is aligned and works clearly, who would have thought that the wire got caught like that and I missed this moment. Sometimes I’ll be more attentive. Thanks to everyone who follows the life of Grasshopper.

Source:

Reasons for rough engine idling in a Chevrolet Niva. Their decisions

• The Niva Chevrolet SUV has an engine as its heart, and in order for it to work efficiently and its productivity not to decrease, it is necessary to monitor the health of the air and fuel systems, and if the engine does not idle smoothly, then first of all you need to look for the reason in these two systems.
• Interruptions may be associated with failure of such parts as:

• electric pump
• injectors
• as well as spark plugs

• 1 Problem solving
• 2 Condition of spark plugs

Problem solving

Therefore, you need to find the reason why the engine is not working correctly and fix it as quickly as possible.

In order to understand what exactly has gone wrong, you need to start the engine at idle and listen to how it works; if regular popping sounds are heard from the exhaust system, this indicates that there are problems with the operation of one of the cylinders. This may be due to several reasons:

1. No spark to spark plugs
2. The injector may have failed
3. Low compression in one of the cylinders, or there is a strong air leak into it

If the popping does not appear evenly, you can try replacing all existing spark plugs, even if they seem normal. If popping noises occur regularly, you should turn off the engine and open the hood, and check the condition of all existing ignition wires; they should not have any damage or oxidation of the tips.

To check the condition of the spark plugs, you need to remove the wire ends and unscrew the spark plugs with a special wrench. Check what condition they are in, if they look good, then put them in place, the main thing is that they are absolutely dry, if there are any drips, you can throw them away, also check what kind of gap they have, it should be from zero eight to zero nine millimeters.

If the engine does not operate smoothly at idle, you need to check the spark at the spark plugs. You can do this in the following way

1. We take the spark plug, fix it on the engine so that the thread is on the body
2. We connect the wire from the first cylinder to the spark plug, start the engine, if the interruption does not get worse, replace the spark plug with a new part. If after replacement there is an increase in interruptions, then it is necessary to check all the cylinders sequentially to understand which spark plug is faulty.

If, after following all the above recommendations, the problem remains, then you should contact a specialized car service center, where they will measure the engine compression. If the compression readings are more than one MPa, this is considered normal; if the reading is more than zero one MPa in one of the cylinders, then the engine needs to be repaired.

Symptoms of a problem

It is easy to determine if the DX is broken if you know the typical symptoms. To do this, observe the behavior of the vehicle. Usually the signs are factors.

1. The engine stalls when changing gear. When a manual driver releases the gas pedal, the engine goes into idle mode and if the device is not operating correctly, the air supply channel may be completely blocked.
2. The opposite problem is excessive amounts of XX. Without load, the internal combustion engine works too actively, which leads to excessive fuel consumption and premature wear of the moving pairs.
3. The engine stalls when warming up or cold starting.
4. The crankshaft speed constantly fluctuates without applying a load. You can also hear it. Experienced drivers can determine the stability of its operation by listening to the sound of the engine.

Compression reduction

A drop in this parameter may indicate a malfunction with the internal combustion engine or wear of its elements. Over time, valves and pistons burn out, resulting in compression.

Engine compression is directly related to throttle. The cylinder or cylinders stop working. It is noteworthy that you need to proceed to checking the compression at the very last moment, when all other possible causes have already been checked. The fact is that you will have to interfere with the installed engine system, open the engine, and only a qualified mechanic can do this. Any incorrect action can damage the power unit.

The internal elements of the engine may break, for example, if the timing chain breaks. True, this does not happen often, but the problem should not be ruled out. A compression test will help determine the condition of the pistons and rings. For example, if the readings are low during measurement, you need to pour a little oil into the cylinder and then check again. If the compression indicator increases, there is definitely a malfunction in the piston group.

Video: why does the VAZ 2109 trip when cold?

And finally, let’s say that the most common cause of tripping is spark-producing elements, that is, spark plugs. It is recommended to change them in a timely manner to avoid more complex problems.

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How to check the idle speed sensor

There are several ways to check a part; you can do it yourself. The standard injector is not difficult to maintain. In this case, there are two diagnostic options.

The first method involves the presence of a multimeter - the device is connected to the regulator and the system is dialed. The second requires the presence of a known good module (scientific poking method).

Manual check

It involves removing the old one and installing a new element in its place.
The elimination method allows you to accurately determine that the malfunction occurred here. When performing this operation, you should completely disassemble the entire throttle assembly and clean it additionally.

Diagnostics with a multimeter

The next option is more humane. For diagnostics, you do not need to disassemble half of the engine. To do this, remove the regulator power terminal and connect the leads of a multimeter to the paired contacts to measure the resistance of the windings. At the same time, it should be taken into account that the normal winding resistance is 55-60 Ohms, there should not be a breakdown between them - the device readings are zero.

Adjusting the idle speed of a Chevrolet Niva

The idle air regulator is a special device that regulates the air supply. It is made in the form of a cone-shaped valve, which is driven by an electric motor. The ECU is activated, which determines the required channel opening level.

The Niva Chevrolet idle speed control is non-separable, therefore, if there are problems with its operation, it must be completely replaced. Dismantling is somewhat difficult, since to remove the regulator it is also necessary to disconnect the throttle assembly.

How to clean

Often the cause of device failure is contamination. The ingress of dust and the formation of oxides can interfere with signal transmission. Typical cleaning looks like this:

1. The contact group of the regulator is opened and the contacts are wiped with a cotton swab dipped in alcohol. This will help remove oxidation and increase network conductivity.
2. If the sensor is covered with oil, it should be removed and washed with alcohol. The shut-off valve and spring are additionally processed.

Replacing the low speed regulator on Shnivy

To change the device on the machine, follow a simple sequence.

1. Park the car in place and let it cool. Working with a hot engine is inconvenient and dangerous - heated blocks can burn your hands.
2. Remove the terminals from the battery.
3. In some cases, to ensure complete tightness, craftsmen coat the connecting layer with varnish. Therefore, the throttle valve must be removed entirely and only then the regulator must be dismantled.

1. Remove all pipes and hoses from the remote control, having first disconnected the electrical power.
2. The last step is to remove the sensor. Two screws are unscrewed and the module is removed.
3. After this, you will need to clean all surfaces and channels from dirt, carbon deposits and possible oxidation.

1. Installation and subsequent assembly are performed in reverse order.

You can also watch the video on how to replace parts.

How to identify a problem with the idle air control on a VAZ Chevrolet Niva car

Symptoms of IAC malfunctions are in many ways similar to TPS (throttle position sensor) malfunctions, but in the second case, most often the “CHECK ENGINE” lamp clearly indicates a TPS malfunction.

Malfunctions in the operation of the idle speed controller (IAC) 21203 - 1148300 are difficult to identify, because the idle speed sensor on the Chevrolet Niva - 2123, VAZ 2131 (NIVA) and VAZ - 2120 "Nadezhda" of their modification is an actuator and is not covered by a general control system, and if there is a malfunction in its operation, the “Check-Engine” indicator light does not signal.

But some characteristic symptoms suggest that the idle speed sensor is faulty, for example:

— unstable idle speed;

— when setting the gearshift lever to the neutral position, the engine stops involuntarily;

— idle speed decreases noticeably when other devices (heater, headlights) are turned on;

— involuntary increase or decrease in speed, regardless of the engine operating mode;

— when a cold engine starts, difficulties arise in reaching higher speeds.

There are several ways to check the idle speed sensor on the Chevrolet Niva - 2123, VAZ 2131 (NIVA) and VAZ - 2120 "Nadezhda" modifications.

Let's look at some of them.

Checking the voltage going to the regulator.

— We put the car on the handbrake or install anti-roll bars so that it does not roll;

— Disconnect the sensor from the wire block;

— We check the presence of voltage with a conventional voltmeter: the negative probe is on the engine, the positive probe is on the terminals of the connecting block, wires A and D.

— Turn on the ignition and analyze the resulting measurements. The operating voltage must be at least 12 V. If it is less, there may be a problem with the battery charge.

— If there is no voltage (open circuit), we check the electronic control unit and the entire circuit.

— Circuit resistance measurement. We analyze terminals A and B, C and D one by one - a working sensor will produce 53 Ohms.

- We measure Ohms in pairs B and C, A and D - the resistance if the IAC operates correctly will be infinitely high.

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The following information will also be useful to you: How to independently replace the idle air control (IAC) on a Chevrolet Niva -2123, VAZ 2131 (NIVA) and VAZ - 2120 “Nadezhda” modifications?

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