Knocking sound from rear, no engine start required
09-18-2012, 05:45 AM
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Knocking sound from rear, no engine start required
I hear a knocking sound for a few seconds from the rear of my 2004 S4 when I turn the key to the on position. It is independent of the engine, this knocking occurs with or without starting the engine.
I recorded the audio by placing a microphone outside the vehicle underneath the trunk. Here is the result: http://youtu.be/dxujW1LQztc
Does anyone have a lead on what this could be? This happens either less or not at all if the car has been running for a bit.
I recorded the audio by placing a microphone outside the vehicle underneath the trunk. Here is the result: http://youtu.be/dxujW1LQztc
Does anyone have a lead on what this could be? This happens either less or not at all if the car has been running for a bit.
09-20-2012, 05:35 AM
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I had my regular mechanic listen to the recorded audio and he thought right away that the sound is from the fuel filter. I will replace it and report back with the results.
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