1. Engine malfunction - a decrease in compression in one or more cylinders, suction of additional air into the engine intake tract. Coking of the exhaust system or damage to the exhaust gas converter.
2. Malfunction of the power supply system - clogged nozzles and fuel filter, hoses of the fuel supply system. Insufficient supply of the fuel pump. The use of low-quality fuel.
3. Malfunction of the ignition system - failure of the spark plug, breakdown of the high-voltage circuit of the system.
4. Fault engine management systems — failure of system sensors. If any sensor fails, the electronic control unit switches to work according to a backup program that allows you to get to a garage or car service, but the power and economic characteristics of the engine are reduced.
5. Clutch slip due to wear or damage adjustments.
6. Malfunction of the brake system - braking of one or more wheels on the go, incorrect adjustment of the parking brake.
7. Insufficient tire pressure.
8. Car overload.
A complete diagnosis of the car should be carried out by highly qualified craftsmen using special diagnostic equipment, so contact a car service.
You can independently carry out the following work.
1. Check and adjust the air pressure in the tires.
2. Check the operation of the service brake system and parking brake. Take off wheels not required for this. Find a flat section of the road and in dry, calm weather, conduct a ride to determine the run-out of the car. The car must be fully fueled, in the cabin - only the driver. Accelerate the vehicle to 50 km/h, level off the speed, and then disengage the gear and coast to a complete stop. Make another run in the opposite direction. The overrun should be about 500 m.
3. Check the operation of the ignition system as described above.
4. Check clutch operation.
The initial check is carried out on a flat, obstacle-free area.
Set the choke control knob to a high idle speed - approximately 1500 min-1.
Depress the clutch, engage 1st gear and depress the brake pedal. Then begin to slowly release the clutch pedal.
If the engine stalls, the clutch is working and not slipping. In this case, check the adjustment of the clutch actuator.