Why is Haval h2 dithering at idle speed?

Engine idling jitter is a common fault phenomenon, and the main reasons are finally carbon deposition, air leakage, lack of cylinder, low cylinder pressure, damaged claw pad and unqualified fuel.

1, there are too many carbon deposits in the throttle, injector and air intake, which may be one or all of them.

2, ignition coil, spark plug, nozzle and other mechanical failures, resulting in lack of cylinder.

3, oil pressure or cylinder pressure, resulting in insufficient power, etc.

4. The fuel quality is unqualified.

5. Idle speed control valve is damaged or too dirty.

6. Air leakage in the intake manifold.

7, engine arm or claw pad damage, etc.

The simplest method: when idling, if the jitter is serious, it will be obvious in the car; If it is slight, you can pull open the engine compartment cover and put your hand on the engine protective cover (plastic cover) to feel it. Under normal circumstances, slight jitter is normal.