When I start the car and reach upto 18KM/hr, The Car makes some "TUK"
What is your question?
I can feel this sound in my accelerator pedal. Every time when I stop the engine and start again, it happens. If i stopped and move again without turn off engine, it wont happen. And I am sure that this is not related with transmission because TUK sound is coming alone without any jitter or jumping.
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