What Causes Engine Shaking and Stalling During Cold Start?

[Lindsay]

Common causes of engine shaking and stalling during cold start include a dirty throttle body or excessive carbon buildup in the fuel injectors. Carbon deposits typically accumulate on the throttle body inner wall, intake valve heads, intake manifold inner walls, piston tops, and combustion chamber inner walls. Excessive carbon buildup on the throttle body inner wall can lead to insufficient air intake, making the engine difficult to start or prone to stalling at idle. A cold start refers to starting the vehicle when the engine coolant temperature is low. If the engine starts smoothly after several consecutive attempts under normal operating temperature, it indicates the battery is in good condition. When the engine RPM gradually decreases, timely recharging is necessary. Regular battery inspection and maintenance are beneficial for reliable vehicle starting.