Jerks during acceleration

The cause of jerks during acceleration can be, as in the previous case, insufficient fuel pressure in the fuel rail. The electronic engine control unit, having received a signal from the throttle position sensor about the intensive opening of the damper at a large angle, seeks to maximize the fuel supply, but due to the reduced fuel pressure it is not able to do this. The reasons for this phenomenon and the method of verification, see subsection «Jerk at the moment of the beginning of the movement».

In addition to these reasons, jerks during acceleration of a car with an automatic transmission can be caused both by an insufficient amount of working fluid in the box, and by a malfunction of the box itself.

NOTE: An automatic transmission vehicle may experience jerky acceleration at the start of the first trip after disconnecting and reconnecting the battery. This is not a malfunction, because after several accelerations, the electronic unit will calibrate the gearbox control and the gear shift will become smooth.