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Old 01-20-2007, 12:53 AM   #1
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Rattling muffler...

Whenever I start the engine cold, my muffler rattles. I wonder if this is a common problem, and if so, is there an easy fix? And yes, after a few seconds, it goes away, hence, it's no a big deal -- but sometimes it's kind of embarrassing to start it up (cold) when people are around.

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Old 01-20-2007, 01:08 AM   #2
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i hope for your sake it is a exhaust rattle, My 97 had a "rattle" until i realized its a lifter inside the engine that has lost its tension and will rattle until oil comes into contact with it about 1 second after the engine has started. Sometimes its a very quiet tap tap tap tap tap and then sometimes its a loud TAP TAP TAP TAP TAP and it embarrasses me but im lucky to usually have no one around when I start my porsche which has just accured to me as very very very odd but true....
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Old 01-20-2007, 02:55 AM   #3
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Exhaust rattle most probably is a loose heatshield from the kat(s). Bolts tend to rust leaving the shield to ratlle.

To replace the bolds I think the rearbumper must come off. I let my garage put a little new weld on it. 5 minutes work when the car is on a lift and rattle is gone forever.

===

The hydrolic lifter tapping is annoying too. You might try a thicker oil. Porsche recommends and factory fills with Mobil I 0W40. I've last put Mobil I 5W50 in it and it is a lot quieter / nicer.


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Old 01-20-2007, 12:53 PM   #4
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I have what seems to be the muffler rattle. It does it warm or cold, but only when I'm in reverse to back into the garage?
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Old 05-15-2007, 07:27 AM   #5
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Same with me. Rattles for about 3 - 5 seconds on cold start, then goes away. Warm starts are fine. Anybody else have any words of wisdom on this?

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