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What Causes Car Shaking When Starting in First Gear with a Cold Engine?

1 Answers

ElianaAnn

07/30/25 6:26am

The most common causes of car shaking during cold starts are a dirty throttle body or excessive carbon buildup in the fuel injectors. Other reasons include issues with the ignition system, fuel problems, or a malfunctioning coolant temperature sensor. It is recommended to visit a 4S shop for inspection as soon as possible to identify the cause and address it accordingly. Below are detailed explanations: 1. Low temperature, insufficient engine temperature: During cold starts, more fuel is required to meet performance demands. Larger spark plug gaps result in weaker ignition energy. Poor fuel atomization at low temperatures demands higher ignition energy. Over time, spark plug gaps tend to widen, reducing ignition energy and affecting performance, leading to car shaking. Additionally, aging ignition coils, old or leaking high-voltage spark plug wires can also decrease ignition energy. 2. Incorrect air-fuel mixture ratio: This can occur in both open-loop and closed-loop control systems. If the car's computer makes an incorrect judgment, errors in controlling the air-fuel mixture and ignition timing through actuators may reduce engine power output, causing shaking. 3. Carbon buildup issues: Excessive carbon deposits on valves and intake manifolds can make cold starts difficult. Since carbon deposits absorb some fuel, the ECU may miscalculate. For example, if the computer controls the injection of 100 units of air-fuel mixture but only 90 units reach the cylinder (10 absorbed by carbon deposits), even complete combustion of the remaining 90 units may not provide sufficient power, inevitably leading to shaking.

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