What Causes Engine Shaking and Stalling After Overnight Startup?

[ElianaAnn]

The reasons for engine shaking and stalling after overnight startup: 1. Low fuel pump pressure; 2. Insufficient spark plug ignition energy; 3. Malfunctioning idle control valve; 4. Possible excessive intake manifold carbon deposits. Since carbon deposits can absorb a certain amount of fuel, the ECU makes incorrect judgments. For example, the computer may control the injection of what it assumes to be 100 units of air-fuel mixture, but only 90 units actually enter the cylinder. Even if the remaining 90 units of mixture burn completely, they still cannot provide the required power. The normal operation of a car engine relies on many sensors. If a sensor fails, it may cause the engine to malfunction. When a sensor fails, the car's computer will generate a fault code. By reading the fault code, you can identify which sensor is malfunctioning.