The car moves in jerks (VAZ-2115)

In relation to a car, a jerk is a short-term spontaneous change in the engine crankshaft speed regardless of the position of the gas pedal. In everyday operation, as a rule, there are series of jerks. The extreme case of a jerk is a failure, a noticeable delay in the engine's response to pressing the gas pedal.

Conventionally, three types of jerks can be distinguished:

• at the moment of the start of movement;
• during acceleration;
• during steady movement, i.e. with a constant position of the accelerator pedal.

To determine the causes of jerks when driving a car with an engine equipped with an injection system, special diagnostic equipment is required, so in this case we recommend contacting a car service specializing in repairing fuel injection systems. However, as practice shows, in most cases jerks are caused by insufficient fuel pressure in the fuel line (ramp) of the engine or a malfunction of the throttle position sensor.

If you have some skills, you can identify the cause of the jerks yourself.