What Causes Severe Engine Shaking During Cold Start?

1 Answers
DelHaley
07/29/25 8:42pm
Severe engine shaking during cold start can be attributed to several factors: Poor combustion within the cylinders leads to insufficient power output, resulting in vehicle vibration. When the engine temperature is too low, both fuel and lubricating oil fail to reach optimal operating temperatures, requiring additional fuel injection during cold starts to meet power demands. Larger spark plug gaps reduce ignition energy - a critical issue during cold conditions when fuel atomization is poor and higher ignition energy is needed. Prolonged use causes spark plug gaps to widen naturally, diminishing ignition energy and consequently affecting engine performance, manifesting as shaking. Additionally, aging ignition coils, deteriorated spark plug high-voltage wires, or electrical leakage can similarly reduce ignition energy.
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