VAZ 2109 Injector does not keep idle speed

Problems with the engine (troits, jerks, pulls poorly), causes

Does the car jerk at low speeds or when accelerating?
Is the engine running rough and the Check Engine light on? Has the car lost its dynamics and doesn’t drive like before? In this article we will tell you about all the possible causes of these malfunctions and how to solve the problem. It is worth noting that the causes of malfunctions are similar for all modern Lada cars (Kalina, Granta, Priora, Largus, Vesta, Niva or XRAY), because AvtoVAZ equips them with engines with identical characteristics.

It is recommended to start searching for a problem with diagnostics (reading errors). If this is not possible, then we first perform a test (or temporarily install a known working spare part/sensor), and only then replace the faulty parts.

If the engine idles or the car jerks when accelerating (driving), possible reasons:

Why does the Audi 100 jerk when running on LPG?

Causes of the problem

Quite often, VAZ 2109 owners encounter a problem when the carburetor does not hold speed at idle.

, and the engine just stops. There can be many reasons, and they are all united by a number of characteristic features.

First reason. clogged idle

. Despite the fact that there are 2 filters in the fuel supply system (coarse and fine), even one point may be enough to clog the injector.

fine filter

The fine filter itself may also become clogged. This often happens if the filter is not replaced in time.

All reasons are associated with easily repairable damage yourself, in a garage or in a parking lot.

The 2109 also stops at idle due to insufficient time to warm up the engine, but experienced drivers do not have this problem. Therefore, it is worth focusing on searching for defects in two directions, checking the patency of the fuel line and setting the carburetor at idle.

Stable carburetor idle is controlled by flow. If the nozzle fails, it should be unscrewed and blown with compressed air to surprise the particles.

There may be several reasons for refusal. The motorist’s task is to identify it and try to eliminate it in the field.

Reason 1. Fuel supply interruptions.

If your car has a thin filter, it needs to be changed regularly, and most importantly, in a timely manner. A filter clogged with sand can be a problem. If yes, just remove the filter and connect the pipe directly.

Leaking fuel hose connection leading to air leakage. If the edges of the old hoses are cracked, cut them off and tighten all clamps after installation.

Reasons for simple float on a carburetor

Of course, this car cannot be called ideal. Therefore, problems may arise from time to time. The idle speed is variable. Such phenomena irritate the driver and lead to unpleasant situations on the road. For example, at any moment the engine can simply turn off.

It is unlikely that you will be able to solve the problem for a long time by pressing the accelerator pedal to maintain speed. Therefore, more decisive action is needed.

OTHER ENGINE AND SYSTEMS FAULTS

• Compression in the engine cylinders is low.
• The cylinder head gasket is damaged.
• The engine control system is faulty.
• The valves of the gas distribution mechanism are burnt out and leaky.
• The exhaust system is leaking.
• The valve clearances are not adjusted (8-valve engines only).
• The hydraulic pushers are faulty.
• The engine air filter is dirty.
• Vacuum hose connections are leaking.

Have you encountered power failures or observed unstable engine operation? What was the reason?

Source

Causes of the problem

When a car jerks, it is accompanied by some associated problems. Particularly characteristic of this malfunction is the tripping of the power unit, as well as loss of traction. This problem is identical for the entire family of cars, but is most typical for its younger brother - VAZ 21099.

So, let’s look at the main reasons why the VAZ 2109 injector misfires, the engine does not pull and jerks:

• Poor quality fuel.
• Fuel pump and gasoline filter element.
• Injectors.
• Spark plugs and high-voltage wires.
• Burnout of valves.
• Air filter and throttle.
• Sensors and ECU.

Solution methods

Once the main reasons why the VAZ 2109 engine fails are identified, you can proceed directly to methods of diagnosing and troubleshooting problems. It is worth recalling that for a complete diagnosis you will need certain tools, as well as design knowledge of the power unit.

We remind you that the VAZ 2109 injector engine has eight valves marked 2111-80.

So, what tools will you need: a set of keys, heads and screwdrivers, a hammer, WD-40, a multimeter, as well as new spare parts that have become unusable. Now that everything is at hand, you can proceed directly to the repair process.

Poor quality fuel

The engine often jerks and tripping occurs because low-quality fuel enters the combustion chambers. This is typical for the CIS countries, especially Russia and Ukraine, since most gas stations dilute gasoline or sell it of low quality.

So, low-quality fuel, in addition to clogging the fuel lines, also, when it gets into the combustion chambers, does not form a normal air-fuel mixture, and therefore the car begins to twitch and jerk, in the worst case, black smoke and shots will come from the exhaust pipe. This means that the gasoline is not the best and should be replaced.

To eliminate the malfunction at this stage, you will have to clean the fuel supply elements, such as the fuel tank, gas lines, injectors and the fuel filter element (which is most likely clogged).

Fuel pump and gasoline filter element

Even if the fuel that enters the engine and its systems is of fairly good quality, you do not need to be sure that the fuel supply elements will not fail. The second reason why a car starts to run poorly is a faulty fuel pump. To be more precise, interruptions in the operation of such an important element lead to an uneven supply of fuel to the engine.

What is the reason for floating revolutions

Car owners often continue to drive their vehicle even if the engine is unstable while driving. At the same time, such a malfunction can have a number of negative consequences. Firstly, floating RPM can easily lead to an accident when the engine stops working and the steering wheel gets stuck when driving or changing gears. In addition, the driver must be constantly distracted in order to stabilize the speed using the fuel pump or simply prevent the engine from stalling by keeping his foot on the gas. Secondly, fuel consumption increases significantly, and all engine support systems operate in alternating mode, which creates additional load on them. The malfunction is easily diagnosed, its elimination does not require significant time and money.

Check the spark plugs first

If the coordinated operation of individual components of the power and ignition system is disrupted, various malfunctions occur, leading to engine failure. One of the first signs of a problem. high engine speed if the injector stops while driving. The most typical manifestation of a possible malfunction. floating idle speed. The number of revolutions can vary from 500 to 2500-3000 per minute with an oscillation interval of about 1 second. In this case, the number of revolutions is periodically equalized. If the amplitude is greater, the engine will probably stall.

There are situations when the control unit receives incorrect information, which is why the electronics cannot make a decision on a given command in a timely manner. If excessive air is supplied and the engine temperature is sufficient for normal operation and the throttle valve is open at the desired level, the control unit may not be able to cope with the problem. When the engine speed is floating or simply high, one of the possible reasons may be a malfunction of the forced accelerator. This will be due to too much air.

Identification of an idle cylinder

The method for identifying a bad cylinder depends on the type of engine power system.

In carburetor engines, the determination of a failed cylinder is carried out experimentally. The essence of the method is to turn off each cylinder one by one by removing the tip of the high-voltage wire from the spark plug while the unit is running.

The check should begin with the 1st cylinder on a warm engine and with the speed set at 1500 rpm. If, after removing the tip, the speed drops significantly (the engine stops altogether, since as a result 2 cylinders will be switched off), the 1st cylinder is working normally.

Next, the test is carried out on the following cylinders. If the cylinder is not running, removing the tip will not affect the operation of the motor. After turning off the “drawdown” there will be no revolutions.

This test method is simple and allows you to accurately determine which cylinder is not working. But when doing it, follow safety precautions. High-voltage wires carry electrical impulses with high voltage but low current. These impulses will not cause damage to health, but the sensations are not pleasant.

Take care of those you have tamed

But nothing more, a hacked gas station! Use only proven network gas stations. You have a summer car, you need to look after it and take care of it, get regular oil from certified manufacturers on time, fill it with high-quality gasoline and love it.

It is not hard. There are many reputable companies in the country that have long occupied their market niches, care about their reputation and have certified quality assurance systems. Among them are representatives of the world's largest oil companies. They carry out geological exploration, development, and exploitation of oil fields, production and sale of petroleum products. The gas stations of these companies offer all types of motor fuel.

A typical gas station is usually a large complex of 12 or more gas stations. The driver can get the necessary assistance from a tanker truck, inflate his car's tires, top up the radiator with water, use the toilet at no extra charge, and shop at the self-service mini-market, where snacks and drinks, including chilled ones, are available. available. There is a small cafe at gas stations; The gas station often smells of freshly brewed coffee.

Sources:

https://expertvaz.ru/21099/inzhektor-vyisokie-oborotyi-plavayut-holostoy-hod.html https://tuning-vaz2106.ru/raznoe/gloxnet-dvigatel-na-xodu-vaz-2110-inzhektor-vaz -2110-gloxnet-na-xodu-inzhektor.html https://expertvaz.ru/2109/inzhektor-dergaetsya.html

Checking the ignition system

The reason that the VAZ-2109 engine “troubles” is the ignition system. Due to its incorrect operation, the combustion process of the air-fuel mixture is not observed in one of the cylinders, which leads to unstable operation of the engine, severe vibration, and a drop in power.

Interruptions in the ignition system, due to which “triple” occurs, give:

1. Candles.
2. High-voltage wires and their tips.
3. Contacts of the distributor cover (distributor).
4. Hall Sensor.

These items should be checked in the same order.

Candles are one of the most common causes of tripping. Exhausted life, incorrect clearance, “breakdown” of the housing and penetration of the impulse to ground - these faults of the spark plug lead to failure or malfunction, which affects the operation of the motor.

You can verify that a spark plug is broken by replacing it with a known good one or swapping it with a spark plug from another cylinder. Replacing the spark plug can eliminate the malfunction of the power unit.

In addition to the spark plug, you should check the condition of the contact in the tip (which is put on the contact nut of the spark plug). It is made of copper and oxidizes over time, which leads to disruption of contact between the wire and the spark plug, and causes “triple” to appear.

In search of the cause, the high-voltage wires are checked next. Over time, the braiding of these wires loses elasticity and cracks, which is why voltage pulses “break through” to the ground, not reaching the spark plug.

A simple way to check the wires is to start the engine at night and open the hood. In the dark, “breakdowns” in the form of sparks are visible. If sparks are noticeable, replace the wires.

Next, look at the distributor cap and the slider. Gradually, the contacts on the slider and in the lid wear out, and they may also oxidize, which leads to loss of contact and interruptions in the operation of the spark plug.

Due to a malfunction of the Hall sensor, there is a failure in the formation of pulses supplied to the switch. Because of this, the operation of the ignition system is disrupted, in which the pulse from the coil to the distributor is missed, and from it to the spark plug.

Do not forget that an incorrectly set ignition timing is another reason for engine tripping. Therefore, in search of the cause, we be sure to check the setting of this angle and carry out adjustment work.

Repairing the idle speed sensor

This method of troubleshooting a VAZ 21099, such as computer diagnostics, is not suitable. Indirect signs will indicate problems:

• stop the engine when idling or changing gears;
• without increasing speed for faster return to operating temperature.

The process of replacing the sensor is not complicated; operations must be performed in this sequence.

• Remove the negative terminal from the battery.
• Press out the plastic tab and lower the contact block from the sensor.
• Unscrew the mounting screws and remove the sensor. Very often the screw is lost during use, so be careful.
• After installing the new sensor, you need to calibrate it on the VAZ 21099 engine. To do this, turn on the ignition for 5-10 seconds after installing the negative wire.

Computer diagnostics will determine exactly why

An important point to consider when choosing an idle speed sensor is the marking of the parts. If the last digit in the number of a failed sensor is a multiple of 2 02 or 04, then this part must be selected for replacement. If the number is odd, the new sensor must be the same.

Among such regulators, the most popular are Omega sensors with index 2112-114830, as well as KZTA IXX 2112-1148300-04. The parts are not only highly reliable, but also available at a price not exceeding 400-450 rubles.

Despite the ease with which anyone can detect a malfunction of the idle speed , replace it and prepare it for work on their own, certain difficulties may arise. It is known that a faulty vacuum brake booster can significantly affect the overall performance of the engine. This is expressed in the intake of more air than is necessary to prepare the fuel-air mixture. In this situation, one or two cylinders will not work properly.

Cause of malfunction. insufficient tightness of the vacuum brake booster, when the air removed by the device is immediately sucked in from the outside. Be sure to check all connections. They can fail and become additional suppliers of excess air to the engine. If all the parts have been checked and there are no visible reasons for unstable engine operation, then you can safely change the vehicle’s idle speed sensor. Stable engine operation in any mode will give you pleasure. In addition, fuel consumption is normalized, which is also important for every car owner.

Testing the mass air flow sensor (MAF)

Remember what the VAZ-2110 says about 8 injector valves: the speed drops and stops. A reasonable question arises: what to do? If the reason is not the MAC, then you should check the mass air flow sensor. Here are some tips on how to do this:

• Disconnect the sensor connector from the on-board system. The controller that controls the motor will operate in emergency mode, which is not fatal for short-term testing. If your car drives much faster, then the problem is most likely with the mass air flow sensor. It's time to clean it up.
• Replace the sensor with a working one, and then see how the engine performs. There are improvements, which means you either need to clean your own MAF sensor or replace it.
• It also makes sense to check the air intake; you need to remove the mounting clip and carefully inspect the air intake from the inside; there should be no condensation or oil on it. If they are found, they need to be cleaned with special means.
• You can also check the mass air flow sensor with a multimeter. To do this, switch the multimeter to voltmeter mode and set it to 2. The sensor has 2 yellow and green wires. Yellow sends a signal to the controller, and green. grounding. With the ignition on, measure between these two wires. The engine must not be running. If the readings are in the range of 1.01–1.02, the sensor is working. Readings between 1.02 and 1.03 on the sensor should be cleared. And if the numbers deviate from the scale to 1.04, then it’s time to get a new sensor.

Here we have identified the main symptoms of a faulty mass air flow sensor, and neither self-testing nor troubleshooting is particularly difficult. Works well without maintenance.

Replacement procedure

Replacement is carried out in the following order:

• We de-energize the on-board system by removing the negative terminal on the battery;
• Disconnect the unit from the sensor. For a VAZ injector, this is done by pressing the plastic clamp;
• We unscrew the two screws, and it is recommended to first unscrew the left fastener, then the right one;
• Now the regulator has been removed, and there are no problems with replacing it with a new one;
• Before installation, it is advisable to lubricate the O-ring with oil. Look to see if there are any tiny cracks on the ring, in which case it needs to be replaced;
• There are no difficulties in the calibration procedure; the electronic relay will do everything. You just need to turn the ignition on for a few minutes and then turn it off. After this, the speed usually no longer fluctuates, and the car drives smoothly.

READ How many liters are in a box VAZ 2109

Checking the serviceability and replacing in case of failure of the idle speed sensor VAZ 2110

A sensor that is also an idle speed

on the VAZ injector, designed to control engine stability.
Besides the fact that no one will be happy if the engine idles or even stops, there is another reason why this governor should operate smoothly.
This is the need to warm up the engine in cold weather. Although it is believed that if the car is equipped with an injector, the engine does not need to be warmed up, but this is a misconception, and it is better not to tear the engine, but first let it run a little without giving high speed.

Symptoms of a problem

Let's look at the main signs indicating a sensor malfunction:

• Idling;
• The engine does not start easily, even if the accelerator pedal is pressed;
• The engine is warmed up, but the speed does not increase;
• The engine stops abruptly in neutral;
• Turnover drops if you turn on household appliances that consume a lot of energy: stoves, headlights, air conditioners, radios.

However, there is no need to immediately run for a new sensor. It will not be possible to replace it if the reason is different: for example, it could be a spark plug or fuel filter.

Testing the mass air flow sensor (MAF)

Remember what the VAZ-2110 says about 8 injector valves: the speed drops and stops. A reasonable question arises: what to do? If the reason is not the MAC, then you should check the mass air flow sensor. Here are some tips on how to do this:

Disconnect the sensor connector from the on-board system. The controller that controls the motor will operate in emergency mode, which is not fatal for short-term testing. If your car drives much faster, then the problem is most likely with the mass air flow sensor. It's time to clean it up.

Malfunctions of the CPG and timing belt

Problems in the cylinder-piston group and gas distribution mechanism are another reason for interruptions in engine operation. This malfunction occurs when:

• occurrence of rings;
• piston burnout;
• burning of the valve plates and their seats.

Malfunctions of the CPG and timing, due to which the engine “trips” appear, are determined by measuring compression in the cylinders. A cylinder that operates intermittently has a lower compression rate than the rest.

Next, we establish the reason for the drop in compression. To do this, pour 20-30 g through the spark plug hole of the cylinder. engine oil, after which we take compression measurements again.

An increased compression ratio indicates the occurrence of rings. We eliminate this problem by decarbonizing the motor.

If the repeated measurement again shows low compression, you will have to remove the cylinder head to determine the cause of the malfunction.

The reason for the “triple” of the power unit can also be a breakdown of the cylinder head gasket. Due to this malfunction, a loss of compression occurs in the cylinder due to depressurization of the combustion chamber.