What Causes Vehicle Shaking at Low Idle Speed?

[RicardoDella]

Vehicle shaking at low idle speed can be attributed to the following reasons: Severe Engine Carbon Buildup: The primary cause of vehicle shaking at low idle speed is excessive carbon deposits on the throttle body or fuel injectors. When there is too much carbon buildup inside the engine, the fuel sprayed by the cold-start injector can be largely absorbed by these deposits. Engine Misfire: An engine misfire occurs when one or more cylinders fail to function properly. This condition is characterized by intermittent exhaust gas flow and noticeable shaking of the exhaust pipe, accompanied by distinct engine vibrations. Irregular Air-Fuel Mixture: This leads to unstable idling after a cold start. The lower the temperature, the more fuel is required for a cold start, and the presence of carbon deposits can significantly affect the smoothness of the cold start process.