You have an old vw van when you drive and let off the accelerator you hear a humming noise if you give it a little gas it stops but when you slow down and come to a stop it makes a thumping noise?

Answers.com > Wiki Answers > Categories > Cars and Vehicles > European Cars > Volkswagen > Air-Cooled VW > VW Vanagon > You have an old vw van when you drive and let off the accelerator you hear a humming noise if you give it a little gas it stops but when you slow down and come to a stop it makes a thumping noise?

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What would cause a thumping noise when taking foot off accelerator?