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Old 07-06-2007, 03:07 PM   #1
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Join Date: May 2007
Location: Denmark
Posts: 71
Rattle Sound recording - what is this ?

98' Boxster, Tiptronic.

It's not very loud but I can hear it from inside in idle and when driving. It IS annoying... it's there all the time, fast or slow, but when driving 'fast' its hard to hear because the regular engine sound is much louder - hot or cold and it's pretty much the same noise, just a rattling sound... at first i though it was like a rotating sound but when I listen under the car I think it sounds more like a vibrating metal sound - I looked under the car tried to push some of the parts but I could not stop the rattle (I do not know what is what anyways)

At one point my mechanic said he welded the the one part of the heat shield because it was a bit loose in one corner...

I have made a recording where the sound is pretty obvious:


What do you think this sound is and can anyone recognize it from their car ?
Is this serious (engine), muffler or heatshield (I read about this a few times here) ?

Should I take this to the mechanic before I leave on a 2000km road-trip ? I just returned from him 2 days ago, but I did not mention this to him and he didn't say anything about it either...

How many of you live with a rattle

Kind regards

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Old 07-07-2007, 02:26 PM   #2
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Join Date: May 2007
Location: Denmark
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Could it be airbubbles ?

I recently had my coolant tank replaced and replaced and I am not sure the vacumed the coolant like I think its supposed to be done ?

Would air in the water pump make that strange sound ?
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Old 07-07-2007, 03:04 PM   #3
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Location: Manassas, VA
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I live with a very slight rattle. I can only hear my rattle when the CD player is low and I am in 5th gear at <1500-1600 RPM (39mph-ish or lower). The rattle usually only occurs if the car is not warmed up. Bottom line - doesn't seem a to be a big deal so I dont care.
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Old 07-07-2007, 05:08 PM   #4
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Location: Canada
Posts: 188
Very hard to tell from your recording but it could be the substrate in the catalytic convertor. The material inside the convetor breaks apart or come loose and rattles around inside.... the only repair is replacement of the unit. Best have a tech listen to it.

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