Why the engine stalls at idle: causes and ways of solving problems

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2020-01-07 10:20:14

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Any self-respecting car owner should monitor the condition of your car and maintain it in good condition. But sometimes there are problems with the startup and operation of the power unit. For example, the engine stalls at idle. What is the cause of this phenomenon, how to deal with it? All this we will talk in our today's article. Before giving the answer to the question about why the car stalls at idle, note that all the problems will relate to faults with the flow of the fuel-air mixture.

stalls at idle

If it's the carb?

On older cars with a carburetor intake system when such symptoms fails automatic choke. This element is “sinks” or badly adjusted. If stalling at idle VAZ-2106, a fault may be leaking from the vacuum hose near the base of the carb. It is not necessary to prevent problems in the cooling system. If the car stalls at idle, check the status of the thermostat. When a faulty valve mechanism does not allow the engine to quickly warm up to operating temperature. In the summer the car is often in full swing.

Details about the intake system

Because the engine needs not only fuel but also oxygen, problems with the revs relate to the air intake manifold. These troubles occur due to air suction in place that goes after the filter. As a result, the sensor air flow is not able to control the process and the car stalls at idle.

The Injector is often equipped with MAF. It is not necessary to ignore it. Often this sensor is polluted 100-150 thousand kilometers. It cannot be fixed – only to be replaced. This item is inexpensive, but because of it in most cases float the revs at idle. The motor stalls because the fuel injectors. Worth checking the condition of the injector. If it is clogged, the crankshaft speed will be unstable. In the combustion chamber gets a different amount of combustible mixture that contributes to the improper working of internal combustion engines.

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stall at idle VAZ

Filters

When a run of 10 thousand kilometers it is necessary to change the air filter. It is located in a plastic or metal housing (for fuel injected and carbureted engines, respectively). If this element follows, as in the photo below, it should be replaced.

But not only is the air cleared in the system. Pay attention to the fuel filters. On diesel engines they are changed every 15 thousand kilometers. As for cars with petrol engines, they are serviced every 50 thousand. The capacity of these elements is 10 microns. If you used poor-quality gasoline or diesel, the inside of the filter is quickly clogged. Located inside the porous paper.

If you have a large amount of dirt item is no longer able to purify the fuel. As a result, the car does not hold idle, stalls. Do not save even the fact that the pump operates under high pressure. When severely clogged, the filter must be changed urgently. Sign replacement also serve as power loss and failures in the dynamics.swim speed at idle and stalling

The Difference between carburetor and fuel injection filters

It is Worth noting that the level of pressure in these systems, the intake is different. Have injection engines it is at times more. Therefore, when buying new fuel filters, you should clarify with the seller exactly what you have the motor. Especially cars, which were installed on different types of systems (e.g. the old and the new “dozens”).

If injection engine to put a filter for the carb, it simply will not withstand the pressure. All the dirt gets in the pump-injector. They are hammered, so the motor stalls at idle. As for air filters, to distinguish them very easily. At carburettor engines they have a round form.

“Nulevki”

If the machine used a filter of zero resistance, with more pollution it can cause problems in engine operation. But the cost of such a cleansing item is 7-10 times higher than normal. Therefore, to clean them, using special sprays. Processed filters every 10 thousand kilometers. After application you should wait until it is absorbed, and for 5 minutes, rinse “nulevik” water. Before installation should be carefully dried. Otherwise when you start the car grab a hammer.keeps idle and stalling

Pumps

If the car stalls at idle, the reason may lie in the low pressure pump. On injection engines, it is submersible and is located in the fuel tank. On carbureted engines this element is separate from the tank and applies to mechanical type. This pump is actuated by using the handle. It creates the right pressure in the system. But if the fuel line is clogged, submersible and mechanical pumps are not working at full capacity. As a result the car stalls at idle.

If the car does not start, check power to the element. Look at the fuses and relays. If the injection motor when turningthe ignition key the pump is not buzzing, then it is not a food. On passenger cars it is located in the rear compartment on the right (under passenger sofa). If it is a diesel power unit, should check the fuel high pressure pump. At low temperatures it accumulates wax – frozen particles of diesel fuel. There are problems with starting the engine, the revs often “float”. One should not rule out mechanical failure. Perhaps a failed Cam drive.

stalls at idle

Electronics

If the car stalls at idle, it is necessary to diagnose the onboard computer. Errors in programming are an incorrect fuel mixture. Because of this, the motor starts to malfunction. This happens when the additional electrical equipment (e.g. air conditioning). The way out of this situation – the reflashing of the ECU.stall at idle the injector

Catalytic converters

With increased environmental regulations on diesel cars began to establish a so-called diesel particulate filters, and diesel – catalysts. They are designed for a certain period of operation (about 150 thousand kilometers). Over time, the core is clogged. The device can't produce normal output and clean exhaust.

The way out of this situation – the replacement of the catalyst on the flame arrestor and flashing of the electronic unit. But at the same rules of exhaust your car will drop to “Euro-1». In the European Union, the operation of such vehicles is prohibited. But if you drive mainly in the CIS, it is the optimal solution to the problem. Because the cost of a new catalytic Converter and particulate filter starts from 40 thousand rubles.the engine stalls at idle

EGR Valve

The Car may stall at idle due to faults of the EGR. When computer diagnostics on the screen appears the error “P1406”. It indicates that the valve is “stuck” in the open or closed position. The car stalls at idle and shows a weak dynamics on high. Over time the valve accumulates plaque. Should remove the element and clean it. But if when you reinstall the symptoms are repeated, it will only be replaced.

the car stalls at idle

Sensor

This mechanism measures the vacuum manifold for adjusting the amount of supplied mixture. The faulty component enters the engine in error. The ECU thinks the motor is operating under much greater or lesser load than there really is. Thus, the control unit removes a certain amount of fuel. The machine begins to stall. The way out of the situation – the replacement of the sensor. So, we found out why the car stalls at idle.


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Alin Trodden - author of the article, editor
"Hi, I'm Alin Trodden. I write texts, read books, and look for impressions. And I'm not bad at telling you about it. I am always happy to participate in interesting projects."

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