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Magnaflow buzzing sound

 
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bcull001
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PostPosted: Thu May 17, 2012 2:11 am    Post subject: Question Magnaflow buzzing sound Reply with quote

Just got my catalytic converter replaced at a local shop. They put in a Magnaflow. Drove it from the shop and noticed a buzzing sound when I get to high RPMs. Is this is an installation error that I should go back and get corrected or is this something that will eventually go away when the catalytic converter gets worn in? This video shows the exact sound I am getting. Specifically the sound you hear at 0:06, :12, :18, :23, :28, :41, :49, :52, and :58 http://www.youtube.com/watch?v=tcwsXHG22Xw

Thanks.
edited to add that this is not my video, found it on youtube, but its the same sound I'm getting
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00impala123
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PostPosted: Thu May 17, 2012 8:48 am    Post subject:   Reply with quote

I can't watch the video because I'm in class, I'll check it out later, but it could just be the heat shield rattling around.

Ill check out the video in a few hours and see whats up

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Lingenfelter
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PostPosted: Thu May 17, 2012 11:38 am    Post subject:   Reply with quote

I'd guess heatshield or loose fastener if it's clamped.

If they didn't replace the resonator, I would assume it's the resonator heatshield. May have broken loose when they were working on the exhaust. It's usually only attached by a few pitiful spot welds which quickly rust away.

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bcull001
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PostPosted: Thu May 17, 2012 2:52 pm    Post subject:   Reply with quote

I couldn't find anything on the internet about wearing in a catalytic converter so I took it back to the shop, the problem was the heat shield was loose. They put a few more welds on it and for the most part the sound is gone but I can still hear it faintly when the car is switching gears or going up a hill. Thanks for the input.
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bcull001
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PostPosted: Tue May 22, 2012 6:26 pm    Post subject:   Reply with quote

Second Update:
The sound has gone back to the level it was at before, I took it back and they looked at it more thoroughly. The heat shield was not the problem, the sound it's making is coming from pieces of the old catalytic converter that broke off and got stuck in the muffler.
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00impala123
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PostPosted: Tue May 22, 2012 6:37 pm    Post subject:   Reply with quote

Damn, that sucks..time to upgrade to something that sounds good?

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XXWoodmanXX
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PostPosted: Thu Jun 14, 2012 11:17 pm    Post subject:   Reply with quote

Hmmph. My guess was it was the EGR opening up intermitently?
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