- carefully inspect the underhood space. Turn off the ignition, check the reliability of fastening, the fit of all wires and connectors at the ignition module and high-voltage wires. Start the engine and listen to its work - crackling during a breakdown of high voltage «to ground» weak but distinct. In complete darkness, a spark is clearly visible during breakdown;
- -replace spark plug regardless of their condition and mileage. Pay attention to the condition of the candles: if it is abnormal, it may be necessary to repair the engine or its systems.
A specific cause of jerks during steady motion of a car with an injection engine may be damage to the throttle position sensor. Additional symptoms confirming the malfunction of this sensor are the following:
- uneven engine idling;
- reduction in maximum engine power.
The sensor is not collapsible and therefore not repairable. If a sensor malfunction is detected (see section «Engine management system»), it is replaced as an assembly.