What happened when the idle speed of Haval h6 suddenly increased and returned to normal?

1, too much carbon deposit in the throttle.

2. Leakage of intake manifold or various valves. This fault directly affects the quality and combustion effect of fuel mixture. Parts that may leak air, such as intake manifold, vacuum tube, activated carbon canister valve, exhaust gas recirculation (EGR) valve and positive crankcase ventilation (PCV) valve, need to be overhauled one by one.

3. Valve timing failure. Valve timing dislocation, incorrect installation of timing belt, excessive carbon deposition in intake and exhaust valves, valve spring fracture, etc. The idle speed will be unstable due to the different air intake of each cylinder.

4. The three-way catalytic converter is blocked. The blockage of three-way catalytic converter not only leads to unstable idle speed, but also leads to insufficient power.