Can a mass air flow sensor cause high fuel consumption?

The VAZ-2114 engine can have 8 valves or 16. The latter option is more powerful. In order for the car not to waste a lot of fuel and to work properly, it is necessary for the mass air flow sensor to produce the correct indicators. Its primary task is to measure the amount of air consumed and the reaction time. The accuracy of the indicators allows the controller to determine in what proportion the air and fuel need to be mixed. If the device shows inaccurate data, then the resulting fuel mixture does not correspond to the engine operating mode. In this case, fuel is consumed in large quantities and power is reduced.

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Hello, I have the same problem (e-gas) 1.1 and the average consumption is about 11, did you solve the problem?

We all loosen the throttle cable together and it will be 0.9

e-gas does not have a cable (e-gas is an electronic gas)

did you solve the issue? I cleaned the damper and now the idle is 1.2l/h.

I cleaned it and now it holds 1.3-1.5

Similar car. At temperatures up to 90 - consumption 1.1 - 1.3. After warming up, the flow rate is 0.9-1.1. Consumption per 100 km: highway - 6-7l, city - 8l.

1.1-1.3 when warmed up

I have 14 e-gas 1.6 shows 0.9 when connected via elm, I even thought that a lot turns out to be the norm))

My father’s 14K xx is warmed up to 0.8…0.7 And I have 1.1—1.3…0.9 fuck you understand

The car is different, but the principle is the same. On my Volga 3102 ZMZ 406 the consumption was 1.6 l/h. The mass air flow sensor was faulty, which distorted and overestimated the data on air consumption, thereby the controller produces more fuel. In rare cases, cleaning the air flow sensor with carburetor cleaning fluid helps. It didn’t help me and I bought a Pekar mass air flow sensor. After replacement, the consumption at idle became 0.9-1.1 l/h. 70% distortion

It may be surprising, but with the Sti-3 shaft the consumption at xx, on a warm engine is on average 0.5 liters (+-0.05) no more, xx is on average 1000, on average because with this shaft there are “holes of holes of holes)))” oh yes, I set the firmware to adjust the bcn for DTV and spent a long time going through the logs) for those who don’t believe me, I can attach the log

Fuel consumption depends on many things! Sensors, engine wear, firmware. many sensors, ranging from air to lambda probes. Wear of the piston system, namely the rings, the intake-exhaust system, namely from the claons. And I’m generally silent about the firmware... so essentially the consumption should be 0.9 -1.0, well, I mean for the stock firmware and units. I have a VAZ 2114 1.5 after a complete overhaul and after running in with the corrected units, the consumption is 0.8-0.9, so figure out what’s wrong with you... In short, there are many reasons, we need to figure it out!)

The mass air flow sensor is necessary for efficient engine operation in different modes. The function of this device is to create a working mixture of air and gasoline vapor. The task of the VAZ 2114 air flow sensor is to measure two interrelated indicators:

1. Amount of air consumed;
2. Reaction time.

Air leak

Checking the intake manifold for leaks

Excess air leakage can cause high idle speeds. Moreover, depending on where excess air penetrates into the intake manifold, the idle speed will either simply be increased or begin to “float” - rise and fall almost until the engine stops .

If the idle speed “floats”, then most likely there is an air leak in the intake manifold.

If there is simply a violation of the tightness of the intake manifold gaskets, damage to the vacuum hoses or sealing rings, then the speed will “float”. This happens due to the fact that the amount of gasoline supplied to the cylinders will be constant, and the quality of the mixture becomes either “richer” or “poorer”. When a certain critical value (air content in the fuel mixture) is reached, the engine will begin to slow down - until it stops. But as the speed decreases, the amount of air entering the manifold will decrease, i.e. the mixture will become richer and the engine will “come to life” - the idle speed will increase. This will continue until the leak in the intake manifold is eliminated. On turbocharged engines, air leaks can also occur through damage to the intercooler or air pipe connections. If there is significant suction (for example, if the pipe has come off the intercooler), the engine begins to operate with a whistling (or hissing) sound. But sometimes it is possible to identify the location of a violation in the intake tract only by cutting off the air supply to the intake manifold in different places in turn - from the air filter to the manifold itself.

What air flow should be on a VAZ 2114?

A 1.5 liter VAZ 2114 engine with a working mass air flow sensor at 850-950 rpm consumes from 10±0.5 kg of air per hour of operation, and at 2000 rpm - from 19 kg to 21 kg. If the amount of air consumed at the same speed decreases, the dynamics of the car also decreases, but fuel is saved. Conversely, increased air consumption leads to increased dynamics and higher fuel consumption. In this case, it may be difficult to start the engine in cold weather. If the sensor readings deviate from the real ones by 2-4 kg, the engine will begin to become very capricious and “dull”. Disabling the sensor will force the motor to continue operating in emergency mode.

Engine wear is one of the reasons for high fuel consumption

Yes, since current seals are not made from paronite, but from cheap rubber that shrinks and cracks in just a week, a sealant will solve this problem and fix it for a long time. disconnect the injection pump from the forward and return lines, take a transparent plastic container with a volume of up to 5 liters with clean diesel, two meter-long tubes, clamps for fastening the structure;.

Causes of malfunction

Common to most domestic cars, the reason why the VAZ 2114 air flow sensor breaks is hidden in the crankcase ventilation system. It has two circuits that ensure operation with the throttle valve open or closed. If the throttle is buried, crankcase gases are discharged along the line (d=1.5 mm) into the space available behind it. A certain percentage of these gases accumulates in the idle line, where it comes into contact with the film-coated MAF resistor. It is also sensitive to fluctuations in the gas mixture in the intake system. The resin settles on the surface of the resistor, and the sensor begins to “lie.” Because of this, the idle air control sticks, and it begins to jam when starting the engine.

Cleaning instructions

As practice shows, cleaning the mass air flow sensor is one of the most effective methods of restoring the functionality of the controller. Therefore, if the sensor breaks down, it is not necessary to change it, especially since such a pleasure today is not cheap. This procedure is necessary because over time it becomes dirty and shows other parameters.

So, how to clean the mass air flow sensor at home with your own hands:

1. You will need a Phillips head screwdriver; use it to loosen the clamp securing the line from the air intake.
2. Next, dismantle the corrugation and visually assess the condition of the system. You may see condensation or traces of engine fluid under the corrugation.
3. Carefully inspect the inside of the controller. If everything is normal with the system, then there will be no traces of leaks or contamination. As practice shows, the sensitive element often breaks precisely due to an excess of contamination. In order not to avoid problems of this kind in the future, it is necessary to periodically replace the air filter. This procedure is carried out in accordance with technical regulations. Engine fluid may enter the controller as a result of an increased level of consumables in the crankcase. Accordingly, this occurs as a result of a clogged oil separator in the ventilation system.
4. The regulator itself is fixed with two bolts on the line. The removal procedure is carried out using an open-end wrench. At this stage, if you are sure that the device has failed, you can replace it.
5. You can see the entrance on which there will be a sealing rubber band designed to protect the device from the suction of dirty air flow. If you do not have a seal, it may have caught on the filter element. Accordingly, this will lead to the regulator input grid being contaminated.
6. Clean the mesh using available materials. To do this, you can use a regular toothpick or toothbrush. After cleaning, the seal can be put back and the regulator can be put back in place.

Symptoms of a problem

A non-working VAZ 2114 mass air flow sensor leads to the appearance of a number of symptoms in the behavior of the injection engine. The malfunction appears gradually, starting with an increase in fuel consumption and floating speed, ultimately destabilizing engine operation.

From personal experience using a front-wheel drive car as an example, I can say that I encountered the following problem: first the injector icon came on, then the speed began to fluctuate greatly and fuel consumption almost doubled.

You can calculate a non-working VAZ 2114 air sensor using the following criteria:

• failures when idling and under load;
• The internal combustion engine stalls when trying to change gear;
• decreased dynamics, the car accelerates slowly;
• fuel consumption increased;
• engine power has dropped;
• Badly ;
• The Check Engine signal appears.

Product on topic: • Solution and prevention

Engine Inspection • Spray cleaner on areas that you suspect are leaking.

Checking the mass air flow sensor

Before you start experimenting, take the time to read the service manual. It describes in detail what a mass air flow sensor on a VAZ 2114 is and how to replace it.

We are looking for a sensor. Open the hood and find the air filter pipe. The mass air flow sensor is located on it, which determines the flow of air passing through the filter. I will give several options on how to check the mass air flow sensor yourself.

• Disable the sensor. Disconnect the block with wires from the connector by pressing the latch located below. Start the engine (1500 rpm or more). The controller understands the shutdown of the mass air flow sensor as an emergency condition and prepares the fuel-air mixture based on the position of the throttle valve. Try driving a short distance. If the car accelerates noticeably faster, this indicates a non-working mass air flow sensor. I would like to note that in the disabled state for ECUs Y7.2 and M7.9.7. RPM doesn't increase!
• Replacing the controller firmware. The original ECU firmware could have been replaced with an alternative one. In such a situation, we do not know which algorithm is prescribed in the case of operation in the mode discussed in the first paragraph. The throttle valve has a stop under which you need to place a thin plate (about 1 mm) to raise the speed. Then you need to disconnect the chip with the sensor. If the sensor is faulty, the engine should stall. If the engine is running, then the reason is due to the firmware features: the IAC steps are written incorrectly.
• Voltage measurement. Testing gives good results when working with Bosch sensors. You will need a multimeter. Select the DC voltage measurement mode and set the maximum value to 2 V.

The connection diagram for the VAZ 2114 looks like this:

1. yellow – incoming signal;
2. gray with white – power output;
3. green – grounding;
4. pink with black – output to the main relay.

The colors may be different, but the sequence of connectors is the same.

Next, you need to turn on the ignition with the engine off. Connect the red (positive) probe of the tester to the yellow output, and the black (negative) probe to the green. Multimeter probes are inserted along the specified wires directly through the rubber seals of the connectors without damaging the insulation. For prevention, I recommend moistening the probes with WD-40. Intermediates or needles are not recommended due to the additional error they introduce. Measure the voltage. Compare the result with the table:

Additive to Suprotek Active Plus motor oil. Sensor failure