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Possible engine knock from using too low a grade of gasoline. If you have a Turbo, VW highly recommends using at least 91 Octane fuel.

Have the motor mounts and trans mounts check as these will thump also upon acceleration as your motor and trans will jump or twist slightly when accelerating. These are basically supports and cushions for your motor and trans. When they go bad there is nothing to really keep them from twisting or moving. Just a possibility.

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โˆ™ 2009-10-09 10:20:16
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Q: What is the cause of a dropping sound coming from the engine as you accelerate?
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