What causes a car to stall while driving
Content
Often on the track, the engine stalls on the go, after a while it turns on. This could lead to an accident. The problem is observed in cars of domestic production and foreign cars.
Causes of a stalled engine:
- Incorrect fuel supply.
- No spark
- The technical error.
The last point is clear: the motor runs unevenly, noisily, and then stops.
Fuel quality
One of the reasons is low-quality gasoline, non-compliance with the requirements for a car in terms of octane number. The driver must remember where and with what kind of gasoline the vehicle was last refueled. If it is indicated that the engine must run on AI-95 or AI-98, it is dangerous to pour AI-92 into the tank.
The problem is caused by fuel: when the accelerator pedal is fully depressed, the speed does not increase, when the clutch is depressed, the power unit stalls. The situation is explained by a weak spark, giving bad fuel.
Troubleshooting requires:
- Drain fuel.
- Wash the engine.
- Clean all fuel lines.
- Replace fuel filter.
Car engines are sensitive to fuel quality.
Spark plug
The car stalls in motion due to spark plugs: clogged contacts, plaque formation, incorrect voltage supply.
If a black coating appears on the candles, a normal spark cannot form. The presence of dirt on the contacts indicates low-quality fuel. The contamination is caused by a malfunction in the oil supply system.
Black dots appear on the candles
Oil on candles is a sign of a breakdown. The vehicle must be sent in for diagnosis. Ignoring the problem can lead to costly repairs.
Attention! If the spark plugs fail, the engine runs unevenly, the car twitches while driving, periodically stops, and starts with difficulty. If there is a reddish-brown coating on the contacts, low-quality fuel is poured into the tank. Candles in this case need to be replaced.
Throttle valve
The cause of the malfunction is throttle contamination. The reaction of the car to the accelerator pedal is late, the speed is uneven, the engine stalls, the part needs to be washed. Necessary:
- Buy a special tool from an auto shop.
- Remove the shock absorber.
- Rinse well.
- Please reinstall.
If these steps do not help, the problem is with the power supply.
In foreign-made cars, the throttle valve could fail. Then, when you let off the gas, the engine stops. The part is responsible for returning the shock absorber to its normal position, eliminating gaps.
To check the shock absorber you need:
- Warm up the engine to operating temperature.
- Open shutter manually.
- Let go abruptly.
The part should return almost to the limit, stop and complete not so quickly. If no deceleration is observed, the damper is faulty. It needs to be changed, repair is not possible.
Dirty throttle valve
Idle speed regulator
On VAZ models with an 8- or 16-valve engine and on foreign cars, the power unit starts and then stops due to the IAC. The wrong name is the idle speed sensor, the correct name is the regulator.
The device controls the motor speed and maintains. At idle, the engine stops working or uneven speed is observed - the part is faulty. When shifting the gearbox to neutral, the engine stalled; you need to change the regulator.
Similar symptoms are sometimes observed with a dirty throttle. It is recommended to clean first.
Air filter
Replacing filters in a car is an important maintenance procedure that many people forget about. As a result, the filter becomes clogged, the operation of the power unit and systems is disrupted. If there is dirt or serious damage, the engine will run unevenly, jerkily; when you press or release the accelerator pedal, it will stop.
Attention! In the same way, the engine stops if the XX regulator fails.
To check for a malfunction, it is necessary to disassemble the filter and inspect it for damage. If it is dirty or worn, it must be replaced.
Clogged air filter
Fuel filter
A dirty fuel filter is another reason why the car stalls while driving. The part is installed on all cars. The problem with the device occurs among owners of used cars. The filter is forgotten and rarely changed.
Over time, the dirt becomes clogged, it is difficult for gasoline to pass into the ramp, there is no combustion chamber. Fuel will flow intermittently, so it may not reach. If the filter is clogged, the machine stops when you press the accelerator pedal.
It is necessary to disassemble the fuel pump, remove the filter and install a new one. There is no point in cleaning - the price of the part is small.
Fuel pump
A faulty fuel pump may cause the vehicle to run normally for a while and then stop. Failures begin in the mechanism, fuel does not enter the chambers or enters in small quantities.
At first, the engine will idle, with an increase in speed it will stop, when the pump finally fails, it will not start.
The fuel pump is easily repaired, but the malfunction may recur, so it is better to change it. This unit is located under the rear seat.
In summer, the fuel pump may work intermittently due to fuel boiling. This happens in classic Soviet cars. To get rid of the problem, you need to turn off the engine and wait for the fuel to cool.
Electrical problems
The car engine stops working while driving due to an electrical problem. Initially, you need to check all the masses.
Battery terminals may be loose, poor contact, no power, rarely a problem.
The generator connections need to be checked. After repair, the master may forget to tighten the terminals, and the device will not charge. The battery will be completely discharged, the engine will stall on the move. The location of the generator on the VAZ-2115, 2110 and 2112 models is similar.
The alternator may fail or the belt will break. This is indicated by an icon on the dashboard. It is recommended to visit a car service, car repairs can lead to breakdown.
You need to check the mass that goes from the minus of the automatic transmission to the engine. For prevention, the terminals are cleaned and lubricated with a special compound.
The reason is a malfunction of high-voltage cables. Not repairable - needs to be replaced.
Defective ignition coil
If the ignition coil is not working, the engine stalls intermittently. There is an increase in fuel consumption, a drop in vehicle power, poor engine start.
The power unit begins to "shake", especially in the rain, the speed is uneven. A malfunction is signaled by an indicator on the dashboard.
To make sure that the coil is faulty, you must:
- When it is "triple", remove one turn. When the repairable one is removed, the revolutions will begin to "float" more strongly, the exclusion of the faulty one will not change anything.
- If the part does not work, the candle will be wet, with a black coating, the resistance is different.
Attention! VAZ cars with an 8-valve engine have an ignition module, the function of which is the same as that of the coils.
Vacuum brake booster
The power unit stops working when the brake is pressed; the problem is in the vacuum booster. The device is connected by a hose to the intake manifold.
A defective membrane cannot create a vacuum at the right moment when you press the brake pedal. Air enters the working mixture, which is depleted. The engine cannot run on this mixture, so it stalls.
To fix the problem, it is enough to change the gaskets and the membrane, sometimes the hose.
Faulty air duct corrugation
On machines with an injection engine, the corrugation of the depressurized air channel (most often broken) may be the cause of the problem. Air enters past the DMRV, incorrect information is sent to the control unit, the mixture changes, the engine stops working.
The engine "troit" and idling. To eliminate the breakdown, it is enough to change the corrugation.
Lambda probe
The sensor is required to analyze the oxygen content in the exhaust gases and check the quality of the mixture. The failure of the device is the cause of poor engine starting, stopping work and reducing power. It also increases fuel consumption. You can verify that the problem is related to the device by running diagnostics.
Defective lambda probe
SENSORS
There are many sensors installed in cars. If one vehicle breaks down, it starts to fail, the engine can “spin”.
Often the engine stops working due to the valve timing sensor. If the part is completely out of order, the car will not start. Due to problems in the device, the power unit will work unevenly, stop periodically.
The sensor may be overheating.
Illiterate firmware
Car owners often demonstrate the vehicle. This procedure allows you to unlock the potential of the engine, improve dynamics.
To save money, motorists reduce the cost of firmware. As a result, the vehicle travels faster and stops when it slows down. The control unit confuses the readings and gives out the working mixture in different ways.
Worth resetting to factory settings. When flashing, you need to choose a good master with extensive experience; wrong settings can do a lot of damage.
Conclusion
These are the main problems that cause the engine to stall while driving and then start again. In order to avoid unforeseen situations on the road, it is recommended to monitor the condition of the car, refuel with adequate fuel. If the machine began to stall, and it was not possible to identify the cause of this on its own, it is better to contact the service center and conduct computer diagnostics of all nodes.
