Cars equipped with electronic fuel supply through an injector, by right, have lower fuel consumption than carburetor engines. There are cases that at first glance an absolutely serviceable car consumes quite a lot of fuel.

We measure fuel consumption on the injection engine

Before taking measures to find problems associated with increased consumption, you first need to measure fuel consumption. This process is not complicated.

Refuel your car "to the eyeballs", reset the odometer reading to zero, and continue driving. Try to drive a car calmly enough, do not make sharp maneuvers, then the odometer will show reasonably accurate fuel consumption readings.

Now, knowing exactly how much fuel you refilled at the last refueling, divide the amount of fuel spent per kilometers traveled and multiply by one hundred. Then you will have the result of fuel consumption, and with minimal errors determine the fuel consumption. This will allow you to understand whether it is worth solving a problem with a high flow rate of a combustible mixture, or the injector is OK and your car consumes the right amount of fuel.

The reasons for the increased consumption of combustible mixture

The most common cause of increased fuel consumption is the failure of sensors that transmit incorrect information to the computer.

                           Sensor breakdown

The main sensors installed on injection engines and the causes of their failure. - Throttle position sensor. When the factory settings of this sensor go astray, it increases the idle speed. In addition, this leads to an erroneous ignition timing angle and the wrong composition of the combustible mixture and air that are fed into the fuel system. All this leads to increased consumption.

See also: Removal of catalysts

— Coolant temperature sensor. Подача горючей смеси определяется по показаниям этого датчика. Если показания этого датчика занижены, тогда расход горючего будет больше обычного. Обычно датчик температуры охлаждающей жидкости выходит из строя при поломки термостата, поломки радиатора или воздушной пробки в системе охлаждения. — Датчик кислорода. Если этот датчик вышел из строя, то система электроники начинает «понимать» что в топливную систему поступает не достаточное количество горючего, после чего дает «команду» на увеличения поступления топлива в камеры сгорания.

— Air flow sensor или датчик абсолютного давления впускного коллектора. Этот датчик регулирует необходимый состав воздушно – топливной смеси и время необходимой ее подачи. При выходе из строя этого датчика, расход топлива увеличивается многократно.

Catalyst breakdown

When catalyst is clogged, fuel consumption increases, as the throughput capacity of the cylinders is reduced. The mechanism does not gain the necessary amount of air, and part of the exhaust gases is deposited in the cylinders. All this makes it difficult to obtain the required amount of fuel. Consequently, the electronics begin to supply more fuel to the combustion chambers.

Air filter clogging

Another quite important reason for high fuel consumption is air filter pollution. To check its cleanliness, simply remove the air filter cover and inspect it. If you see a clear contamination of this filter, it is worth changing it immediately, as this greatly affects the fuel consumption.

See also: engine overheating

Driving style

Finally, I must say that driving style greatly influences fuel consumption. The more intense and “extreme” you drive a car, the more fuel is burned. Try to change the driving style for a while and you will see how much less fuel consumption has become on your car.