The car moves in jerks (Focus 2)

A jerk at the start of movement

Jerks during acceleration

Jerks during steady motion

In relation to a car, a jerk is a short-term spontaneous change in the engine crankshaft speed, regardless of the accelerator pedal position. In everyday operation, as a rule, there are series of jerks. The extreme case of a jerk is a dip - a noticeable delay in the engine's response to pressing the accelerator 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 injection engine, special diagnostic equipment is required, so we recommend contacting a service center specializing in repairing fuel injection systems. However, as practice shows, in most cases jerks are caused by insufficient fuel pressure in the fuel rail or a malfunction of the throttle position sensor built into the throttle assembly cover. In addition, a specific cause of jerks in a Ford Focus equipped with an electronic throttle control system may be a malfunction of the accelerator pedal.

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

[The material was copied from an information website FordBook.ru]