Car stalls when releasing gas: causes and solutions

2024 Author: Erin Ralphs | [email protected]. Last modified: 2024-02-19 11:42

The following problem is often encountered: your favorite VAZ stalls when you let off the gas. VAZ is a simple car, and it will not be difficult to figure out any problem. Yes, this applies to other brands as well. You just need to know how the engine and fuel supply system works. Gradually eliminating all possible malfunctions, you can solve the problem that the car stalls on the go when you release the gas. Where to start?

Candles

Start with the elementary - candles. If the engine stalls when the gas is released and lost in dynamics, the first reason is the candles. Checking them is quite simple: unscrew, look at the contacts. If they are in soot, then most likely there is no spark and, as a result, the cylinder is turned off from the engine. If possible, it is better to change the kit, no - clean the contacts and drive to the nearest auto shop. When cleaning, try not to change the distance between the contacts. Thisoperation with simple sandpaper, if it is not available, then a penknife will do.

High voltage wires

Glow plugs are supplied with current through wires. It often happens that the engine stalls when the gas is released because one or two candles stop receiving voltage. Especially this reason becomes relevant in the cold. The braid of wires in the cold hardens and tends to break from vibrations in the cold. It is treated by simply replacing the wires with better ones.

Check idle speed sensor (DHX)

Finding the sensor is easy, it is located under the throttle assembly and is attached with two bolts. If the throttle assembly (DU) has not been cleaned for a long time, then the cone needle of the sensor and its seat could become clogged and give incorrect data. The main reason indicating a sensor malfunction is that the car stalls when releasing gas and shifting gears. The problem is solved by removing the throttle assembly and flushing it with a carburetor cleaner. The sensor itself is difficult to remove without remote control. You need a small screwdriver and enviable flexibility. There is also a high chance of missing one or two screws. No one usually has a replacement for them.

Injectors

Fuel is injected into the cylinders through electromagnetic injectors. Due to poor quality fuel, they can become clogged and not let enough fuel into the cylinder. From here we have that the car stalls when the gas is released. The injectors are mounted on the fuel rail. Everything is removed elementarily, and you can clean the procedureinjectors to hold yourself at home in the garage. It is only necessary to pre-buy new rubber gaskets for the nozzles and carburetor flushing fluid. We put the wires from the battery on the nozzle and feed liquid from the cleaner can under pressure through the standard tube into it. It is necessary to achieve good atomization of the liquid coming out through the nozzle; when voltage is applied from the battery, the nozzle should click. If this does not happen, then it must be replaced. But it’s better to contact a service that has the necessary equipment and the washing procedure will be done much better.

Fuel Pressure Regulator (RPM)

RDT is quite easy to find, it is mounted on the fuel rail and has the shape of a cylinder. It is a conventional valve that reacts to excess pressure and supplies more fuel to the engine. Again, due to low-quality fuel, it can become clogged and wedged. This malfunction does not have a critical phenomenon, but because of it, when the gas is released, the car stalls, the engine starts hard, the dynamics are lost, and the idle speed “floats”. RTD is inexpensive in stores and is available almost everywhere. Changes in minutes.

Mass Air Flow Sensor (MAF)

The most expensive sensor, so it's the last thing to change when nothing else works. Located on the pipe, after the air filter. It is checked simply: remove the connector from it, start moving. If the engine does not stopwhen you release the gas, then the reason is in the sensor. It is difficult and annoying to understand. It can be treated by specialists with equipment, but it will cost about as much as the sensor itself costs. Therefore, it is better to buy a new one. The main thing when buying is to indicate the number and manufacturer that is indicated on your sensor. With other sensors, your ECU firmware may not work correctly. Installed with simple clamps. We also recommend changing the air filter along with it. It costs a penny, but it will save you from the failure of the new DMRV.

Calibration hole in throttle assembly clogged

Pay attention to your throttle assembly. A small tube runs from it to the valve cover. This is a small ventilation hose. The calibration hole in the throttle assembly is often clogged with dirt and dust from drivers who neglect the air filter replacement schedule. You can fix the problem by cleaning the hole with a piece of wire. To do this, it is necessary to remove the throttle assembly so that dirt does not get into the engine. It is removed simply by unscrewing two 10 bolts and disconnecting the gas cable.

Clogged fuel filter

The above problem may also arise due to the forgetfulness of the owner of the car, who did not change the fuel filter on time. Accordingly, a clogged filter does not allow the required pressure to form in the fuel system. When the engine speed changes, dips will appear in its operation. To avoid this, it is recommended to change the fuel filter along with the oil, oil and air filters.

Fuel pump faulty

Failure of the fuel pump may be caused by oxidation of the wires in the connector. The power supply to the fuel pump is unstable, and, as a result, fuel is simply not supplied to the engine. Fixed by simple cleaning of contacts. There may also be a problem with the pump itself. Nothing lasts forever, and it can fail. But the most common fuel pump malfunction is the contamination of the primary strainer. It does not make sense to wash it, it is better to buy a new one and replace it.

In this article, we looked at the most common causes of engine shutdown while driving. If the information provided in the article did not help solve the problem, we strongly recommend contacting a car service.