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Thud/knock/bump

This is a discussion on Thud/knock/bump within the General Help forums, part of the LSx Technical Help Section category; I have a stock '01 A4 T/A with less than 12k miles on it. Last week it started making this ...

  1. #1
    Pony Hater UKXK189's Avatar
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    Navy Blue Metallic
    2001 Trans Am

    Thud/knock/bump

    I have a stock '01 A4 T/A with less than 12k miles on it. Last week it started making this thud/knock type of sound, but only in first gear. For example, I was driving through a Grocery store parking lot, basically idling down a lane. I gave it a little gas and I heard a single knock/thump type sound from the rear of the car. So, I idled down another lane, gave it a little gas, and it did it again. I have tried to replicate it at side street and highway speeds, but it only does it at very low speeds. I checked my tranny fluid, just to see if it may have been low, but it was fine. Any thoughts? Or am I just being paranoid?

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    Veteran 0rion's Avatar
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    Could be a couple of things but the first one I would look at would be the lower control arms. Does it sound side specific?

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    Pony Hater UKXK189's Avatar
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    Until today, I would have said no. But now it seems to be accompanied by a slight rattling sound from the rear passenger side.

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    Veteran 0rion's Avatar
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    I would crawl under there and check the torque on everything and look at your bushings for the lca's, panhard bar, and your end links.

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    Pony Hater UKXK189's Avatar
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    Will do, thanks!

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