What Causes Vehicle Body Shaking When Cold

1 Answers
GriffinAnn
07/29/25 10:31am
Cold start shaking is fundamentally caused by poor combustion in the cylinders. Here are the key explanations regarding engine shaking:1. Low ignition energy at low engine temperatures: Insufficient engine temperature leads to inadequate fuel and lubricant temperatures, requiring more fuel injection during cold starts to meet power demands. Larger spark plug gaps result in weaker ignition energy.2. Improper air-fuel mixture ratio: Inaccurate fuel-air mixture occurs in both open-loop and closed-loop control systems. In closed-loop vehicles, the oxygen sensor requires a minimum operating temperature of 370°C. During cold starts, the exhaust pipe temperature doesn't reach this threshold, preventing the oxygen sensor from functioning.
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