Engine starts and immediately stalls: causes

Probably no owner of a domestic car, which would never be in a situation where his engine refused to run. This problem is familiar to drivers of foreign cars, but our cars suffer from this “disease” more often.

Often it happens so that The car starts and immediately stalls. The reasons can be many. About them we will talk in this article on the example of the car "VAZ-2109" with carburettor and injection engines.

Everything you need to start the engine

For starting and stable operation diesel power unit, regardless of the type of power system requires only two things: good timely spark in the cylinders and the flow of the fuel mixture in the combustion chamber. In the absence of at least one of these components, all your attempts to start the engine will be in vain.

As a preliminary test of the ignition system is much simpler than the power system, diagnosis start from it.

Check the presence and condition of the spark

To Determine whether the voltage at the spark plugs a snap. Enough to turn one of them to connect a center electrode to a corresponding high-voltage wire to ensure the contact of her “skirts” with “mass” of car, turn on the ignition and run the starter. If the electrodes of the spark there is a strong spark is blue or white-blue, with the ignition all right. Not too much, of course, will be the same way to check all the plugs. The fact that very often the reason that car Starts and immediately stalls, it is the fault of one or more candles. First, the engine starts and tries to work on three or two cylinders. This process is accompanied by the characteristic ‘making’ and vibration of the power unit. A little work at idle, the engine will certainly stall. Cylinders with a non-working candles when it fills with gasoline. When you restart, everything is repeated, i.e. the motor starts “grab”, but after a few seconds terminates.

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If spark is present on all of the candles, pay attention to its color and size. If it has a yellow or red color, and its size is disproportionately small compared to the interelectrode gap, it could also be the reason that your The car starts and immediately stalls.

Solved this problem by replacing the non-working candles. Buying them, remember to comply with the requirements of the manufacturer relating to pre-number and gap.

Diagnose high-voltage wires

If you determined that the spark plugs are all fine, and "VAZ-2109" starts and immediately stalls, as before, you should check high-voltage wires. Due to the permanent loads caused by high voltage, they also often fail. The wiring is in violation of the integrity of the conductor or insulation. In the first case, no electricity is supplied to the spark plug, whereby the spark disappears. If there is damage to the insulation between the conductive residential and “ground” auto breakdown occurs, i.e. the electricity simply goes. Because of this, the spark loses its power, and often the ability to ignite the fuel mixture.

Checked high-voltage wires in the same way as candles. Optional measured value of the resistance of the conductor. Depending on the make and model of the wires, it can range from 0.4 to 0.9 ohms.

Further checking of the ignition system

Have You checked the plugs and wires, replaced the faulty elements, but “nine”, as before, Starts and immediately stalls? Sense to check the ignition coil and switch no. Usually, these items plugs either work or don't work. In other words, if there is a steady spark across all cylinders, the cause must be sought in the fuel system.

Sensors of the system of power injection engine

When the engine of your Vases (injector) engine starts and immediately stalls, but with the ignition everything is normal, the first thing to pay attention to the instrument panel. All problems are fixed to the power unit electronic control unit, the driver is notified with a warning light CHECK. In this case, it is desirable to immediately test device and the error code to determine the fault. But if not, check sensor mass air flow (MAF) and idle air control (IAC).

Often it is a faulty MAF causes the injection “nine” Starts and immediately stalls. This sensor detects the amount of air going through the duct to the intake manifold. On the basis of his data the electronic control unit regulates the concentration of the fuel mixture. The slightest malfunction of the sensor mass airflow leads to improper formation. As a result we have an increase in fuel consumption, floating idle, problems starting of the engine.

Well, not to mention the controller(sensor) idle. He receives a signal from the electronic control unit of the necessary amount of air for the combustible mixture and mechanically increases or decreases its volume. The regulator participates directly in starting the engine and his work on the stage of warming up in idle. So if your car is Starts and immediately stalls, don't forget to check the IAC.

Check MAF

For sensor diagnostics mass air flow we need a shape or a multimeter. MAF located on the air duct going from the filter to the intake manifold. For starters, start the engine and warm it up to normal operating temperature. Pay attention to his momentum. Now unplug the sensor connector harness. The motor should respond by increasing the number of revs to about 1500 rpm Is the ECU turned on emergency mode, wherein in accounting for the formation of the fuel mixture is taken only information obtained from the sensor throttle position. If the operation mode of the power unit is not changed, most likely, the MAF is faulty. To verify this, use the multimeter included as a voltmeter with a measurement limit 2. In the car turn on the ignition, but the engine will not start. The red probe of the multimeter attach the pad to the yellow wire MAF, black – to green. Look at the readings. A healthy sensor voltage between outputs shall be 0,996 is 1.03 V. If it is greater than 1.05 V, the device is, by far, fell into disrepair.

Check the IAC

To check the IAC using a multimeter, is included in the ohmmeter mode. The IAC before diagnosis disconnect from the electrical circuit. First and foremost, measure the resistance between terminals A and B. C and D. It should be in the range of 53 Ohms. Next, measure the resistance between A and C, B and D. Here, it should tend to infinity. If the test results differ from these values, the regulator is faulty and, most likely, he is guilty in the fact that your car is Starts and immediately stalls. Reason the release of the IAC system can be either in the breakage of one of the windings, or in the wear of the guide cone of the needle. In any case, it is better to replace.

Possible fault carburetor

Now let's talk about the problems with running gasoline engines "nines". There are no sensors that affect the operation of the power system, but this does not mean that problems with them less. If you are confident in the health of the ignition system, but your car Starts and immediately stalls – carb the reason for that. Rather, one of its working elements responsible for the operation of the engine at idle.

To Start the test recommended with the electromagnetic valve of idling. This device often leads to the fact that Starts and immediately stalls "VAZ-2109". It does not matter what kind of carburetor installed on the engine.

The easiest method of diagnosis of the valve is to disable connection of devices to the power wire with the ignition on. The clicks that occur at the time of accession, the positive battery wire to the corresponding output, indicate that the solenoid is working properly. If the valve does not react to the flow of electricity, you can safely throw it away. Of course, replacing it with a new one.

Remove solenoid valve, inspect along with the state of the fuel jet of idling. If necessary, blow out and flush it with cleaning fluid to clean the carb. Blockage of the idle jet will also adversely affect the operation of the engine without load.

The problems with the launch of the power unit causes a leak in the system the excess air. As a result, the fuel mixture is depleted and the engine starts to run rough, losing momentum and power. Check the system for leaks in places of fastening of the vacuum tubes going to the distributor and the brake booster and the mounting socket of the valve of idling.

The Car in cold weather starts and immediately stalls

Low temperature can affect engine operating stability only in case of faulty fuel pump. Are you trying to start the engine in a strong frost, it starts but stalls after a few seconds? Try to pump fuel using the pump lever. If the situation has changed, look for a problem in pusher. In addition that can be worn on its sealing strip, which, moreover, in the frost is hardened, he can be covered with frost. All this hinders his movement. As a result, the fuel in the carburetor flows into a smaller volume, which, again, leads to the impoverishment of the fuel mixture.