What Causes the Car to Shake When Sitting in the Seat?
1 Answers
When sitting in the car at idle, the most common reason for feeling a slight shake is a dirty throttle body or excessive carbon buildup in the fuel injectors. When there is too much carbon buildup inside the engine, the gasoline sprayed by the cold-start injector is largely absorbed by the carbon deposits, resulting in an overly lean air-fuel mixture during cold starts and making it difficult to start. Here are some related explanations: 1. Gasoline absorbed by carbon deposits: The gasoline absorbed by the carbon deposits is then sucked into the combustion chamber by the engine's vacuum, enriching the air-fuel mixture. This causes the engine's combustible mixture to fluctuate between lean and rich, leading to idle shaking after a cold start. 2. Check the spark plugs: Inspect the condition of the high-voltage wires and ignition coils. Poor performance of the ignition system or weak spark from the spark plugs can also cause such issues. The solution is to check if the spark plugs have excessive carbon buildup and replace them if necessary. 3. If you have already cleaned the engine carbon deposits, cleaned the throttle body, replaced the gaskets and spark plugs, but still notice shaking at idle, it is recommended to visit a 4S shop to check the fuel supply pressure and the intake pressure sensor. Abnormal fuel pump pressure or incorrect readings and poor performance of the intake pressure sensor can also cause the car to shake.
