Idle speed regulator VAZ 21214 injector where is it located

Removing the throttle assembly
The throttle assembly is removed to replace the idle air control or throttle assembly gasket. Disconnect the negative wire from the battery.

Partially drain the coolant.

Use a Phillips screwdriver to loosen the clamp securing the air hose to the throttle body.

Disconnect the air hose.

Loosen the clamp and remove the crankcase ventilation hose from the throttle body fitting.

Use pliers to loosen the clamps.

Remove the coolant inlet and outlet hoses from the throttle body fittings.

Loosen the clamp and remove the adsorber hose from the fitting.

Disconnect the throttle position sensor and idle air control connectors.

Disconnect the cable from the damper drive pulley.

Using a 13mm socket with an extension, unscrew the two nuts securing the throttle assembly to the receiver.

Removing the throttle assembly

The connection is sealed with a gasket

The air flow in the receiver is organized by a plastic sleeve.

The flat on the bushing should face the flat surface of the receiver

Install the throttle assembly in reverse order.

The tightening torque of the nuts is 15–20 Nm. Add coolant.

Removing the idle air control

Remove the throttle assembly.

Using a Phillips screwdriver, unscrew the two screws securing the regulator to the throttle assembly.

Remove the idle speed control.

The connection is sealed with a rubber ring.

Install the idle air control in the reverse order.

With a new regulator, use a caliper to check the distance between the end of the valve needle and the mounting flange: it should be no more than 23 mm.

This is necessary in order not to damage the regulator during installation - the regulator needle should not rest against the seat of the throttle assembly.

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

Lubricate the regulator O-ring with engine oil. The tightening torque for the regulator mounting screws is 3–4 Nm.

Source

Description of IAC

Operating principle of the IAC The
idle speed regulator was installed only on Nivas with fuel injection and a mechanical throttle. When installing an electronic throttle, IAC is not used, since the entire IAC process is controlled electronically.

The regulator is designed to regulate engine speed at idle by adjusting the air supplied to the cylinder head. The IAC is a DC motor with a worm gear on the shaft, which has a cone installed that regulates the air supply through the IAC channel in the throttle assembly.

This sensor is quite unreliable, often subject to breakdown and replacement. Due to its unreliability, it was subsequently abandoned in favor of an electronic throttle.

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IAC device

The idle speed control is a DC motor. Below is a diagram describing the parts that make up the Niva IAC.

Movable air flow valve;
IAC fixing plane;
Winding;
Shaft with worm gear;
Output (connector);
Sleeve;
Frame;
Anchor;

Checking the IAC Niva

Checking this sensor to accurately identify its failure must be carried out in two ways: visual inspection and multitherm testing. Let's look at each of the checks in more detail.

Visual inspection

This check is carried out only after removing the IAC from the remote control.

It is necessary to check the condition of the regulator body; there should be no chips, cracks or gaps between the metal and plastic parts.

The presence of all rivets securing the plastic part of the sensor is checked, since the absence of a rivet may be accompanied by the passage of air.

Check the condition of the rubber sealing ring. There should be no burrs or cracks on it.

The mobility of the worm shaft is checked. He should move around without biting.

Check that there is no carbon deposits on the regulator cone.

Checking with a multimeter

Since the sensor is mechanical and, in principle, its design is based on a conventional DC motor, the test is carried out by measuring the resistance of the IAC winding.

To check on a multimeter, set the switch to measure a resistance of 200 ohms.

We connect the multimeter probes to the central terminals of the IAC and measure the resistance on them. The reading on the device screen should be close to 50 ohms. If the device shows 1 or infinity, then most likely a winding break has occurred.

If the winding breaks, the idle speed regulator VAZ 2121-2123 must be replaced with a new one.

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Replacing the sensor

Replacing the idle speed regulator on a Niva is quite simple and easy. To complete this procedure without error and with ease, we recommend following the instructions below.

Replacement process

Disconnect the negative terminal from the battery. This is necessary to avoid short circuits during operation.

Remove the connector from the sensor.

Unscrew the two cross-shaped screws securing the regulator to the throttle body.

We remove the regulator from its seat.

Installing a new regulator is done in the reverse order. Be careful and don't forget to install the O-ring. Without this rubber ring, the remote control will not be sealed and unwanted air leaks are possible.

Source

Signs of a malfunction of the idle speed sensor in a Chevrolet Niva

A malfunction of the idle speed sensor in a Chevrolet Niva has pronounced symptoms - the power unit stalls, engine speed fluctuates after starting or drops below 500 RPM. This behavior of the engine causes significant inconvenience to the driver. Therefore, every car enthusiast knows how to diagnose an IAC malfunction and replace it if necessary.

Content

Types and designs of IAC in Chevy Niva
How the regulator works and where it is located
Signs of trouble
Causes of malfunctions
Features of diagnosing the idle speed sensor
How to replace the idle speed sensor in a Chevrolet Niva
Conclusion

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.

The driver releases the gas pedal while driving.
The next stage is the closing of the throttle channel, the flow of air into the engine stops.
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).
Using the DPKV, the on-board computer determines the number of engine revolutions and, if necessary, opens or closes the passage hole.

Types and designs of IAC in Chevy Niva

The idle speed sensor, also known as the valve or idle speed controller (IAC), is an actuator responsible for supplying air to the intake manifold to maintain idle speed within the limits specified by the manufacturer. As a rule, the IAC maintains from 700 to 900 crankshaft revolutions per minute at idle. In warm-up mode, the number of revolutions is higher.

The Chevrolet Niva is equipped with IAC with the index 21203-1148300, which is also suitable for other AvtoVAZ all-wheel drive models (4x4 and Nadezhda) with an engine capacity of 1.7 to 1.8 liters. The factory IAC is equipped with a stepper motor, which is connected to the valve responsible for the air supply. The valve tip is made in the form of a metal rod with a needle at the end. To increase reliability, the regulator is equipped with a steel tip, which increases its service life and allows the use of gas-cylinder equipment on the Niva.

How the regulator works and where it is located

The Niva idle speed control is integrated into the engine throttle valve and attached to the throttle body using two threaded screws.

The operating principle of the regulator is as follows:

As soon as the engine is started, the electronic control unit measures the temperature of the power unit and gives a command to maintain the standard crankshaft speed at idle when the gear is not engaged and the throttle valve is closed.
The Chevrolet Niva IAC maintains the required speed using a stepper motor, which sets the desired channel diameter by extending the rod and increasing or decreasing the diameter of the bypass channel. If the engine is not warmed up, the IAC increases the engine speed; if it is warmed up, it maintains the required amount.
As soon as the throttle valve opens, air begins to flow into the intake manifold through it. When the throttle valve is closed, the transmission is disengaged, and the engine is not turned off, air begins to flow again into the intake manifold through the idle air control.
At the same time, the IAC plays the role of a load regulator when energy consumers, for example, a stove or headlights, are turned on. If the load increases, the IAC increases engine speed, thereby compensating for the loss of power.

We carry out the adjustment ourselves

Niva 21213 can be subject to adjustment of the starting system by the gap at the edges of the valves, if the carburetor is removed, or by the crankshaft speed directly on the car. In the first case, the gap at the location of the lower edge (in the direction of air movement) from the throttle valve is set to a width of 1.1 mm. It is adjusted with a screw that has a 0.7 cm hexagon on the head and a slot from the shank. This operation is carried out with the cam lever turned counterclockwise from the starting system control (all the way). In the same position, the gap at the lower edge of the air damper is set to 3 mm using a screw in the cover from the diaphragm mechanism in the starting system (you need to loosen the lock nut). At the same time, the rod from the diaphragm must be forcibly recessed completely into the adjusting screw. After adjustment, the screw is fixed with a locknut.

Signs of trouble

A faulty Chevy Niva idle speed control has similar symptoms to a faulty throttle position sensor. Therefore, during further diagnostics it should be determined that the problems lie precisely in the IAC.

Signs of IAC malfunction:

unstable operation of the power unit at idle until the engine stops;
engine tripping;
difficulty starting the engine, which is facilitated by pressing the accelerator pedal and adding gas;
a drop in speed below 500 RPM when the stove, headlights, and other energy consumers are turned on;
During a cold start, there is no increase in engine speed.

Reference. The malfunction of the Chevrolet Niva idle speed control does not have any specific features compared to other brands and models of cars.

Design features of the Ozone carburetor for Niva 2121

The Ozone carburetor device, suitable for the Niva 2121 all-terrain vehicle, can be of two types:

With serial number 2107-110-7010-10, it is distinguished by the fact that this carburetor:
not equipped with a vacuum corrector.
With serial number 2107-110-7010-20, the difference is that this device:

Common features of the Ozone design of both models include:

Durable, massive body (thanks to this, the carburetor device is practically not deformed).
Fuel jets with a large diameter (this involves the use of Ozone for low quality fuel fluid).
The idle system is equipped with a solenoid-type shut-off valve.
The second chamber with a throttle valve is pneumatically driven.
Diaphragm trigger.
The mechanical control system is equipped with a cable drive, which leads to the air damper of the first chamber.
Accelerator pump with ball valves.

Causes of malfunctions

Since the IAC itself is a fairly simple device, there are few reasons for its malfunctions. These include:

physical wear of the component parts, primarily the stepper motor and valve stem;
open circuit of the valve power supply;
burnout of the stepper motor winding;
destruction of the sealing ring.

Reference. Also, improper operation of the idle air regulator may be due to contamination of the unit. Carbon deposits can clog the bypass channel and get inside the sensor. As a result, the regulator begins to jam during operation.

How to replace the idle speed sensor in a Chevrolet Niva

Replacing the idle speed control on a Chevrolet Niva is required if the part fails. The device is non-separable and can be completely changed. When choosing a new IAC, you should pay attention to the factory index. Only IACs containing code 21203-1148300 in the index are suitable. The specific suitable model can be found in the car's owner's manual.

To change the regulator, you must perform the following sequence of actions:

The car is placed on a flat surface and the parking brake is applied.
Before replacement, you should disconnect the negative terminal of the battery, thereby de-energizing the electronic control unit.
Then the engine protective cover is removed.
The fastening is loosened and the cable running from the accelerator pedal to the throttle assembly is disconnected.
The nuts securing the throttle assembly are unscrewed, after which it is dismantled entirely.
The idle air control connector is disconnected.
Using a Phillips screwdriver, unscrew the screws securing the IAC to the throttle assembly.
The regulator is removed from the mounting socket in which the new IAC is installed.
Next, assembly is performed in reverse order.

Important! At the same time as replacing the sensor, you can clean the throttle assembly from accumulated dirt and carbon deposits.

After installing a new IAC, it needs to be calibrated. Calibration is performed by turning the ignition key for 5-10 seconds, without needing to start the engine. The new regulator regulates itself. After this, you can start the engine and observe the idle speed of the engine.

Procedure for removing the device.

To remove this device, you need to stock up on a small set of tools, consisting of a 13mm socket wrench, a screwdriver and pliers.

Place the vehicle on a flat surface and secure it with the parking brake. If there is any doubt about the stability of the car, you need to install wheel chocks.
After this, you need to disconnect the battery terminals.
We unscrew the fastening nuts and studs that secure the receiver to the throttle valve. In this case, there is no need to disconnect the pipes of the cooling and crankcase ventilation system.
Disconnect the terminals from the wires
Using a Phillips screwdriver, unscrew the valves on the throttle valve
When the device mount is unscrewed, you can remove it from its seat. Usually, you can get the O-ring along with it. But, in some cases, it may get stuck in the damper well.
In this case, it is necessary to carefully dismantle it.

But sometimes the device may be working properly, but problems in operation are associated with its clogging. In this case, you can try cleaning it with carburetor cleaner. Typically, this method helps to revive a device that has no visible mechanical damage. But this measure does not guarantee a 100% result, but is only temporary, which allows you to get to the nearest service station or store with spare parts.

The idle speed of the Chevrolet Niva may be incorrectly adjusted if the sensor has increased travel between the valve and the supporting surface. When measured with a caliper, this distance should not exceed 23 millimeters.

Compliance with these parameters is necessary in order to ensure correct installation and not damage the throttle body.

Before installation, the seat must be cleaned. You can also lubricate the O-ring with engine oil to make it easier to put it in place.

Throttle sensor.

The Niva Chevrolet throttle sensor can also affect the smooth operation of the engine at idle. This component controls the amount of air mixture that enters the cylinders. The main task of this part is to make this quantity optimal for high-quality ignition.

The Chevrolet Niva throttle valve is regulated by a special sensor, which, if necessary, closes it, forming a vacuum in the intake system, or opens it, allowing the air mixture to pass through.

If the TPS is faulty, then malfunctions occur during idling. In this case, you need to remove the element and carry out diagnostics.

1. First you need to disconnect the wire block to de-energize the sensor

2. To check its functionality, you need to use a multimeter to measure the voltage between the first and third connectors in the block. In this case, you need to move the damper position from closed to open.

3. The element itself is secured with 2 screws, which need to be unscrewed for replacement.

4. After removing the element, check whether there is an o-ring left in the seat. You need to check its appearance and if everything is in order, install it in place.

5. Now you can install the new part and reassemble in reverse order.