What Causes Idle Vibration in Haval H2?

[BrandonAnn]

Haval H2 idle vibration may be caused by fuel quality issues, severe engine carbon buildup, or ignition system faults. Fuel Quality Issues: Statistics show that most idle vibration problems encountered by car owners are caused by fuel quality issues. Occasional use of poor-quality fuel not only damages engine performance but also leads to minor issues like body vibration, thereby increasing later maintenance costs. Therefore, when refueling, always pay attention to fuel quality and use reputable gas stations. Severe Engine Carbon Buildup: Excessive dirt on the throttle valve or a significant amount of gasoline sprayed by the injector being absorbed by carbon deposits can result in an overly lean air-fuel mixture in the combustion chamber, making the engine harder to start. Solution: Clean the fuel system and check if the idle speed motor has carbon buildup, which should be cleaned thoroughly. Ignition System Faults: Ignition system vibrations are generally caused by ignition coils and spark plugs. Main checks include whether the ignition coil has signal loss, poor contact, or module failure. For spark plugs, check for carbon buildup, insulator cracking, gaps that are too small or too large, or excessive resistance or leakage in the high-voltage coil.