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Old 10-17-2013, 12:30 PM   #1
fast89gt
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Default noise coming from catalytic converter

Guys Iam getting a noise from my wifes 2001 pontiac firebird 3.8
At first I thought it was coming from the trans. Today I jacked it up and its coming from the catalytic converter!! The noise sounds like a bunch of nuts banging around. The noise does stop after about a min or so. Does this mean the conveter is taking a shit???
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Old 10-17-2013, 12:47 PM   #2
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Default Re: noise coming from catalytic converter

Does it have a Heatsheild that has come loose? ...common problem
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Old 10-17-2013, 12:52 PM   #3
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Default Re: noise coming from catalytic converter

Could be that The inner matrix material has shattered. replace. We had a chevy van that did the same thing,,same sound. Took if off and tipped it on end and all the fun stuff started clunking out in chunks and dust.
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Old 10-17-2013, 01:14 PM   #4
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Default Re: noise coming from catalytic converter

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Originally Posted by 3gdwrench View Post
Does it have a Heatsheild that has come loose? ...common problem
I did check the heatsheild Its tight..

Thanks guys for the help, I think iam going to have too replace it soon And what sucks is this car only has 53,000 miles on it!!!
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Old 10-18-2013, 08:32 PM   #5
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Default Re: noise coming from catalytic converter

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Originally Posted by Mod View Post
Could be that The inner matrix material has shattered. replace. We had a chevy van that did the same thing,,same sound. Took if off and tipped it on end and all the fun stuff started clunking out in chunks and dust.
Yep, I had a Jeep that the converter chunked apart on. I actually had parts of the converter bouncing around in the muffler by the time I got it fixed.
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Old 10-18-2013, 08:42 PM   #6
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Default Re: noise coming from catalytic converter

For sure the guts break loose and will rattle like a loose sounding converter . I just replaced one of the 2 on a 2004 chevy 1500 truck.
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Old 10-19-2013, 01:00 PM   #7
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Default Re: noise coming from catalytic converter

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For sure the guts break loose and will rattle like a loose sounding converter . I just replaced one of the 2 on a 2004 chevy 1500 truck.
lol. That was something else I was thinking about that sounded the same. College buddy had a converter bolt that wiggled loose and dropped down on his Olds, it would get picked up and ground between the flexplate and ?? occasionally. Sounded like hell unleashed. loose ball bearings in a Mixmaster.
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