MISTRA Cold Start Shaking
1 Answers
If you notice severe shaking after starting the car, it indicates an abnormal condition in the vehicle. Here is the relevant information: 1. When there is excessive carbon buildup inside the engine, the gasoline sprayed by the fuel injector during a cold start can be largely absorbed by the carbon deposits. This results in an overly lean air-fuel mixture during cold starts, making it difficult to start the engine. Only when the carbon deposits become saturated with gasoline does the engine start more easily. After starting, the gasoline adsorbed on the carbon deposits is then sucked into the cylinder by the engine's vacuum pressure, causing the air-fuel mixture to become too rich. The fluctuating lean and rich conditions of the combustible mixture lead to idle shaking after a cold start. 2. For vehicles with four or more cylinders, if the shaking is more severe than usual, check the engine compartment for any abnormalities. Look for signs of a cylinder not working or multiple cylinders performing poorly. Common symptoms include burnt spark plugs, excessively large spark plug gaps, or loose connections. If these issues occur, the vehicle will shake. In such cases, stop the car and carefully inspect the spark plugs for integrity. If you have the tools, remove the spark plugs for a thorough check.
