What about the engine jitter of Buick Excelle?

Regarding the problem of unstable idle speed you mentioned, since no existing vehicles are seen, the analysis may be caused by excessive carbon deposition in throttle valve, idle motor, intake valve, intake pipe and combustion chamber, spark plug and fuel nozzle. Because these carbon deposits will block the idle channel, make the idle motor jam or exceed its adjustment range, resulting in low idle speed and unstable idle speed. Also pay attention to check whether there is any leakage in the fuel injector, which leads to the fuel injector still in the fuel supply state after the throttle valve is closed, which leads to the excessive mixture when driving at low speed, which leads to the unstable idle speed after the fuel is turned off, and even more seriously leads to flameout. Then the weak ignition system will also lead to this phenomenon.

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