Bonneville started growling at me today - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 11-23-2005, 01:50 AM   #1
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Default Bonneville started growling at me today

Its been cold and rainy all day today and when I came out from work to start the Bonneville, it sounded like a boat. It almost sounds like theres a hole in the muffler, but closer to the front of the car, seems to be on the drivers side. Assuming this is some type of exhaust leak, will I still be able to drive for a while. In the next two days I have to drive probably almost 200 miles in the B'ville. I have had a chance to visually inspect my wounds, I was just hoping for some pre- feedback. Thanks.
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Old 11-23-2005, 01:59 AM   #2
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the cat may have been clogged and then blown out.....if there is a hole in the pipe, you may be able to get a exhaust patch to take care of the hole for the trip
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Old 11-23-2005, 02:04 AM   #3
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The exhaust pipe may have disconnected itself from the catylitic converter.
Does it sound like this?
http://media.putfile.com/100_034753
This was my car when the front flange of the cat broke off and disconnected the exhaust from the motor.
(apologies, but I could only get it in Quicktime)
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Old 11-23-2005, 07:47 AM   #4
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Check your downpipe and crossover pipe donut gaskets. It appears you may be EGR-less, so you can rule that out.
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Old 11-23-2005, 09:25 AM   #5
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Could be a cold grumpy car growl. Is it continuing to make this noise all the time or was it just the once?
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Old 11-23-2005, 11:27 AM   #6
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It made the same noise this morning, although it didnt seem as bad. After the engine warmed up with my head under the hood, I could barely hear it. When im underneath the drivers side I can hear it though.
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Old 11-23-2005, 11:35 AM   #7
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Quote:
The exhaust pipe may have disconnected itself from the catylitic converter.
Does it sound like this?
http://media.putfile.com/100_034753
This was my car when the front flange of the cat broke off and disconnected the exhaust from the motor.
(apologies, but I could only get it in Quicktime)
Yes it sounds very similar to that.
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Old 11-23-2005, 11:49 AM   #8
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I just checked under the car. The appears to be a small crack right before where the ?downpipe? goes into the cat. Also the support for the cat seems to be just resting under the cat, but it looks like there is a spot for it to mount to. If this is correct then it looks like the mount must have broken off. It is still supporting the cat, but it is not directly mounted to it.
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Old 11-23-2005, 11:54 AM   #9
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I'd run it by an exhaust shop and have them weld up that crack and resupport it properly. At this point it'll be a cheap fix up.
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Old 11-25-2005, 01:12 PM   #10
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When I was driving on Thanksgiving the downpipe has completely broken right before the cat. You should hear how loud it is now!!
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