Why Does an Automatic Transmission Car Shudder When Starting?

1 Answers
LaLawson
07/29/25 12:56pm
Automatic transmission car shudders when starting due to the following reasons: 1. The throttle is too dirty, causing uneven air intake and operation; 2. Fuel line blockage, leading to insufficient fuel supply at low throttle and uneven operation of engine cylinders; 3. Abnormal operation of the transmission; 4. Broken or burned high-voltage wires or spark plug failure, causing some cylinders to misfire and resulting in unstable engine operation; 5. Battery voltage is outside the specified range. An automatic transmission does not require the driver to manually shift gears; the vehicle automatically selects the appropriate gear based on driving speed and traffic conditions. There are six gear positions, from top to bottom: P, R, N, D, S, L.
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