What Causes Haval Idle Vibration?
1 Answers
Haval idle vibration can be caused by the following reasons: Severe engine carbon deposits: The most common cause of idle vibration is excessive carbon buildup in the throttle body or fuel injectors. When there is too much carbon inside the engine, the gasoline sprayed by the fuel injector during cold starts is largely absorbed by the carbon deposits, resulting in an overly lean air-fuel mixture and making it difficult to start. Under these conditions, the engine only starts easily once the carbon deposits are saturated with absorbed gasoline. After starting, the gasoline adsorbed on the carbon deposits is drawn into the combustion chamber, making the air-fuel mixture too rich. The fluctuation between lean and rich mixtures causes idle vibration after a cold start. The lower the temperature, the more fuel is required for cold starts, and the presence of carbon deposits significantly affects cold start performance. The solution is to clean the carbon deposits from the throttle body and fuel injectors. Poor ignition system performance: Faulty spark plug ignition can also lead to engine idle vibration. The solution is to check the ignition system for faults and whether the spark plugs have excessive carbon buildup. If necessary, replace the spark plugs promptly. Unstable fuel pressure: If the engine carbon deposits have been cleaned, the throttle body has been serviced, or the spark plugs have been replaced, but the idle vibration persists, it is recommended to visit a 4S shop to check the fuel supply pressure and the intake pressure sensor, among other components. If the fuel pump supply pressure is abnormal or the intake pressure sensor readings are incorrect, it can also cause idle vibration. The solution is to inspect these components and replace them if necessary.
