A jerk at the start of movement (Focus 2)

At the moment of starting the movement, the extreme case of jerking - failure - often occurs. The most unpleasant sensations are associated with the delay in the engine's response to pressing the accelerator pedal. Sometimes the engine even stalls.

The jerk occurs at the moment the throttle valve begins to open, when the ECU determines the moment of transition from idle mode to load mode based on the signal from the throttle position sensor and must increase the amount of fuel supplied through the injectors. If the pressure in the fuel rail is insufficient, even with an increase in the injection duration, there is not enough fuel for smooth starting. For the fuel pressure testing method, see the subsection "Checking the fuel pressure in the fuel system".

In addition, a jerk may also occur due to a malfunction of the electromechanical part of the throttle assembly and contamination of the throttle valve with deposits from crankcase gases.

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