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Old 10-11-2010, 08:53 AM   #1
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Catalysts Rattling

'99 with 92K. CEL not on. Not heatshield.

What are my alternatives to stop the noise??

Many thanks,

Boston Tom
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Old 10-12-2010, 11:10 AM   #2
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Could you describe how you know that the catalysts are the problem and what the noise sounds like? I have a rattle that is related to the exhaust and I don't know what it is.
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Old 10-12-2010, 11:51 AM   #3
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I had a low RPM rattle on a thick metal shield on my passenger cat (not the flexible diamond pattern stuff all over the underside of the body) and it drove me NUTS.

So I jacked up the back of the car on jack stands, rolled under the car with a hammer in my hand, and started tapping bits and pieces to see if I could duplicate the sound.

When I found it, I whacked the crap out of it a couple of times (felt real good btw) and took the car for a drive. Problem solved!

Your rattle may not be inside your catalytic converter itself. Check it out and bring a hammer with you just in case you can fix it while you're looking to isolate it.
'97 Boxster (Black Hole for 42,000 Dead Presidents and counting) - 122k
New motor, transmission, suspension, and on and on and on it goes...
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Old 10-14-2010, 07:45 AM   #4
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Cats Rattling--enough to shake your fillings!

Thanks guys.

No it's definitely the cats--put it up on a hoist while running.

I've had & fixed the heat shield problem before--not this time, unfortunately.

What I was hoping to hear, has anyone replaced their cats with the straight pipes or whatever.


Boston Tom

'99 986 92K
'73 914 2.0L (48K miles)
'08 A4 2.0L
'89 930
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