Why Does an Automatic Transmission Car Shake When Starting?
1 Answers
Reasons why an automatic transmission car shakes when starting: 1. Insufficient engine temperature: When starting a cold engine, the temperature inside the engine is similar to the surrounding environment, which is not ideal for engine operation. In low temperatures, fuel atomization is poor, leading to reduced ignition energy and consequently affecting the vehicle's power performance, causing shaking. This phenomenon is more common in winter. Therefore, parking the car in a garage during winter can help alleviate engine shaking. 2. Incorrect air-fuel mixture ratio: During a cold start, the engine oil viscosity is high, and various components are not fully lubricated, making it prone to an incorrect air-fuel mixture ratio. The car's computer may misjudge this, reducing power output and resulting in shaking. 3. Carbon buildup in the engine: Carbon buildup is one of the significant causes of cold-start shaking. During daily driving, varying driving conditions and habits can lead to different levels of carbon deposits. Excessive carbon buildup on the valves and intake manifold can make cold starts difficult and may cause insufficient power or even stalling while driving. If the carbon buildup is severe, it should be cleaned promptly. If you cannot handle it yourself, you can visit a 4S shop for professional assistance.
