Thread: Knocking Sound
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      06-21-2012, 11:32 PM   #1
Aries326's Avatar

Drives: 2008 Z4 3.0si
Join Date: Aug 2011
Location: NC

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Clutch knocking sound now rattling

I've recently noticed a knocking sound coming from my Z4. I've never noticed it before but I wouldn't call myself a real car guy like some of you fellas who wrench on your own vehicles or have been around cars forever.

It's unlike the lifter tick which is higher pitched. My car used to have it until the lifters were replaced a few months ago. This knock is lower pitched and happens all the time without fail after I've driven my car. The sound disappears when I step on the clutch. My brother thinks there is a problem with the "throw out bearing". I have no clue. He's the mechanic but he works on Audis.

Is this knocking normal? Thanks in advance for the advice.