The speed of the VAZ 2112 16 valves freezes

Causes of poor speed gain

General view of the engine under the hood

So, let's look at what the problem is and where exactly you need to look for it:

• Fuel pump and pressure.
• Injectors.
• Fuel rail.
• Ignition system.
• Electronic control unit.

Now that all the causes are predetermined, you can begin sequential diagnosis and methods for solving the problem.

Options for solving the problem

To diagnose all of the above systems you will need a set of wrenches and screwdrivers, a tester, a little knowledge and hands growing from the right place. The main task remains to correctly distribute the sequence of operations. This is exactly what we will talk about next. So, let's look at where we need to go to remove the effect that has arisen.

Fuel pump, filter, rail and injectors

Fuel pump in the process of disassembly and diagnostics

First of all, for diagnostics it is necessary to diagnose the gasoline module (pump). If the car drives at high speeds, then everything is fine with the pump itself, but the problem may lie in the filter mesh . For inspection, you will have to remove the fuel pump and replace the cleaning screen on it, which is primarily responsible for purifying gasoline. Most likely, it is dirty and needs to be replaced.

General view of the fuel filter

The second problem may be the fuel filter, which needs to be replaced. It is often dirty and needs to be replaced. After the first two elements of the fuel system have been replaced, you can try to drive it and see if the problem goes away.

General view of the fuel rail with injectors

If, nevertheless, the car continues to gain momentum poorly, then you need to crawl under the hood and look for the problem directly in the fuel injection system. To do this, you need to measure the pressure in the fuel rail.

To do this, dismantle the fuel rail with injectors and disassemble the assembly. The first element must be checked for leaks. Injectors are often installed on a special stand, cleaned and diagnosed. If necessary, all damaged elements are replaced.

Ignition

Unscrewing the spark plugs from the engine

If the fuel system has been checked and is working properly, then you need to look for a problem in the ignition system. So, the high-voltage wires are dismantled and the spark plugs are unscrewed. Both elements are checked using a tester . Of course, it is best to diagnose spark plugs on a special spark plug stand. As practice shows, the problem in 50% of cases lies precisely in this unit, so after checking it is necessary to replace the damaged elements. We conducted a special survey on the choice of candles.

ECU error codes

If all of the above reasons are eliminated and the components are working properly, then most likely the firmware has failed or a critical number of ECU errors have accumulated.

To eliminate the cause, you need to connect the laptop to the engine control unit and carry out diagnostics.

As practice shows, the problem is generally resolved by replacing the software. Instead of standard software, many motorists install Paulus products, although most simply reset the settings to factory settings.

Reading ECU errors using the instrument panel

Causes of malfunction

Before we begin to analyze the issue, it is worth understanding that the power unit requires certain components in order to function. An engine requires four components to run properly: air, fuel, spark and functioning electronics.

Based on this, you can determine exactly where the fault may be hidden and identify the main components. The VAZ 2115 engine is having problems with the 8-valve injector, where to look for the reasons:

• Sensors and ECU.
• Fuel, as well as its supply components.
• Air.
• Sparking.

Fuel pump, filter, rail and injectors

1. It is necessary to diagnose the gasoline pump. If the car drives at high speeds, then everything is fine with the pump itself, but the problem may be in the filter mesh. For inspection, you will have to remove the fuel pump and replace the cleaning screen on it, which is primarily responsible for purifying gasoline. Most likely, it is dirty and needs to be replaced.
2. The problem may also be the fuel filter, which needs to be replaced. It is often dirty and needs to be replaced. After the first two elements of the fuel system have been replaced, you can try to drive it and check if the problem goes away.
3. If the speed is still poor, you need to crawl under the hood and look for the problem directly in the fuel injection system. To do this, you need to measure the pressure in the fuel rail. Dismantling process: dismantle the fuel rail with injectors and disassemble the assembly. The first element must be checked for leaks. The injectors must be installed on a special stand, cleaned and diagnosed. Damaged elements are replaced.

conclusions

Determining and eliminating the causes of poor speed of the 16-valve VAZ-2112 engine is quite a difficult matter. It is necessary to go through each node step by step, which may be the cause of the malfunction. Well, if the motorist was unable to diagnose the problem on his own, then it is recommended to contact a car service center, where specialists will quickly determine what the problem is and fix it.

Guys, tell me, well, in short, I washed the injectors and installed the ramp. Then, for various reasons, I had to remove the ramp 10 times. Then there was a problem with gas. When you press the pedal lightly (at any speed and at any rpm), the car behaves calmly. When you sharply press the pedal to the floor (well, when overtaking or in competitions), you feel like the car is sort of choking on gasoline. It seems to stop accelerating as expected. And the harder you press, the more stupidly the car clamps. Consumption has also increased. I filled the amplifier into the tank, the car seemed to come to life, but sometimes I felt jolts when I pressed the pedal for the first time.

Causes

There may be several reasons for the lack of proper speed gain:

• There are problems with the air supply;
• The ignition has failed;
• Fuel system malfunctions have occurred;
• There were problems with the exhaust system.

Fuel system problems are common in gasoline engines. They are the most common. Therefore, you should start with checking it.

Fuel system

If problems arise when accelerating the car, start checking by inspecting the fuel system.

1. Most often, the engine stops gaining momentum because the fuel pump fails. At first, this may have a slight effect, sometimes unnoticed. Over time, as the pump wears out, the speed and power will begin to drop, and the acceleration dynamics will decrease.
2. If the fuel pump is partially damaged, it still partially performs its functions, but is no longer capable of delivering the same volumes of fuel. This results in fuel starvation and power loss.
3. The best solution to a problem with the pump is to replace it. It is better to trust repairs to specialists.

Ignition

If the ignition fails, you will have to conduct a comprehensive check of all system components that may cause a drop in engine power and speed.

What to check

Peculiarities

Checking timing marks

If the marks are installed incorrectly, fuel will not be injected in a timely manner, and the correct frequency of spark supply will be disrupted.

You will have to check all the sensors that take part in the operation of the ignition system. Pay special attention to the crankshaft and camshaft position sensors. A regular test allows you to quickly determine whether the sensors are really to blame

If the belt has been in use on your vehicle for a long time, it may be at the end of its service life. Or it was installed incorrectly when replacing it. After all, it is enough to make a mistake by one tooth, and the performance of the car will be impaired, the car will not be able to accelerate properly

In some cases, they do not allow the car to start at all if there is a malfunction, but sometimes they lead to a noticeable drop in power. Remove them, check their condition, clean them, measure the distance between the electrodes. If they fail, simply replace them with new ones.

To finally verify the presence or absence of problems in the ignition system, it is recommended to conduct more detailed diagnostics.

Diagnostics

We suggest you familiarize yourself with several steps aimed at diagnosing the condition of the ignition system. This may help determine why the engine is not revving up.

1. Make sure that the electronic control unit is performing its functions. First of all, turn on the ignition and listen to whether the fuel pump starts working.
2. Measure the pressure in the fuel line. If the readings fall within 2.5-3.0 kg/cm3, then everything is fine.
3. If the measurement readings are normal, check the BitStop parameter using scan tools while cranking the crankshaft. If the parameter is indicated “no”, then the ECU receives the command to create a spark at the plugs and works well.
4. Using a high-voltage spark gap, you can check for the presence of a spark. After all, it’s not uncommon for worn-out, dirty spark plugs to be to blame.

Air supply

It is not uncommon for engine thrust to deteriorate due to a disruption in the normal air supply to create the air-fuel mixture.

If there is more air, the mixture will be lean because the amount of oxygen will exceed the amount of fuel. Hence the drop in power and decrease in traction.

The easiest way to solve an air supply problem is to replace the air filter. In order to prevent and prevent problems from occurring, this element should be changed twice a year.

Checking the mass air flow sensor

If the engine speed increases, but the speed does not increase, there are several possible explanations for this phenomenon:

• The pressure in the fuel system is too low;
• The operation of the mass air flow sensor is disrupted. The sensor most often returns to its previous performance after cleaning. If it doesn't help, replace it;
• The air filter is clogged. It is better to replace it;
• The nozzle is clogged. This is mainly due to the low quality of the fuel you fill your car with.

When releasing the gas, the speed is increased or “freezes”: common malfunctions

Let's start with the fact that on many cars with an injector, the ECU raises the speed while the internal combustion engine is warming up. This is necessary to ensure that the power unit operates stably after a cold start.

However, after the temperature rises, the control unit reduces the idle speed, bringing it to normal. On many cars with a carburetor, the driver independently increases the speed during warm-up, using the so-called “choke”.

Moreover, after the engine is warmed up, the normal idle speed is, on average, 650-950 rpm. If you press the gas and release the accelerator, the speed should increase, and then decrease again to the specified values.

• So, let's start with common carburetor problems. Often the engine speed does not drop due to problems with the throttle valve. For example, when the driver steps on the gas, the throttle must be opened wider to allow more air to enter the cylinders to burn fuel. After the gas pedal is released, the throttle closes and the speed decreases.

If the damper does not close completely, an over-enriched mixture enters the cylinders, and the speed is increased. The cause may be severe contamination of the throttle assembly or damage to the valve itself (deformation). First you need to clean the damper; carburetor cleaning liquid is suitable as a cleaner.

We also note that the damper does not close tightly even when the drive cable is worn out. In this case, the cable must be replaced. On carburetor cars, engine speed often does not drop even if the gasket between the carburetor and the cylinder head has failed. The culprit may also be an intake manifold that is damaged.

The main task is to find the correct ratio of fuel and air. Often, a high level of fuel in the carburetor float chamber also leads to increased speed. The check should begin with the needle valve.

• Now let's move on to the injector. Please note that on many injection cars, after cleaning the throttle valve, the assembly also needs to be additionally “trained”. As for problems, the injection system itself is more complex, that is, there are more reasons for high speeds compared to the carburetor.

In simple words, if the specified sensor gives an incorrect signal, the ECU considers that the engine is cold and activates the warm-up mode. In this case, the control unit raises the speed so that the power unit operates stably and reaches operating temperature faster.

Special attention should be paid to gaskets, since air leaks can lead to disruption of mixture formation. This means that you need to separately inspect manifold gaskets, injector seals, etc.

Messages 18

1 Topic by raslanka1 2014-12-17 12:33:40

• raslanka1
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Topic: If you press the gas pedal sharply, the car does not move (no traction)

good day everyone. Guys, please tell me the car does not pull. VAZ 2112 2002 in 16th class. 1.5. I passed three diagnosticians, everyone shrugged. The reason is that at idle it works smoothly without any complaints, as soon as you start driving the traction disappears. I noticed this thing: if you press the pedal slowly, the car accelerates normally, but when you sharply press it to the floor, the traction disappears, as if you were dragging a Kamaz truck behind you. The pressure in the rail was measured, the compression was measured, the fuel pump was changed, the injectors were washed, the spark plugs were washed, all the filters were changed. Even the firmware was changed to standard. what else could be wrong?

2 Reply from Admin 2014-12-17 13:17:14

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Re: If you press the gas pedal sharply, the car does not move (no traction)

BB wires and MH wires remain

3 Reply from raslanka1 2014-12-17 13:35:44

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Re: If you press the gas pedal sharply, the car does not move (no traction)

4 Reply from Admin 2014-12-17 14:52:21

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Re: If you press the gas pedal sharply, the car does not move (no traction)

raslanka1 , ignition module

5 Reply from raslanka1 2014-12-17 16:30:44

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Re: If you press the gas pedal sharply, the car does not move (no traction)

I'll try tomorrow. I'll unsubscribe.

6 Reply from Anton 2014-12-17 16:45:46

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Re: If you press the gas pedal sharply, the car does not move (no traction)

It wouldn't hurt to check the TPS

7 Reply from Aleksandr.21124 2014-12-17 17:26:03

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Re: If you press the gas pedal sharply, the car does not move (no traction)

And check (in one thing) - the mass air flow sensor.

8 Reply from Anton 2014-12-17 18:04:07

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Re: If you press the gas pedal sharply, the car does not move (no traction)

exactly

9 Reply from raslanka1 2014-12-17 18:21:11

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Re: If you press the gas pedal sharply, the car does not move (no traction)

DMRV installed new 37 e. but the old one was 816, if I’m not mistaken, I can’t understand.

10 Reply from Anton 2014-12-17 18:22:29

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