LOUD BANG from rear end **NOW WITH PICS** - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 08-20-2006, 02:39 PM   #1
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Default LOUD BANG from rear end **NOW WITH PICS**

Today, I was driving along, and all of a sudden, I hear this godawful banging/clunking sound comming from the rear. It sounds like metal banging against metal. So I thought maybe it was the strut mounts, like on my old Cutlass, but the difference was, it would do it even if I was going down a perfectly smooth road. And it was not constant either. Just all of a sudden it would do it. I went down a really rough dirt road, and I couldn't hear a thing! So I went home and sprayed all the sway bar bushings with silicone spray, and the it stopped, but I don't know if that had anything to do with it. It never did it before!
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Old 08-20-2006, 05:48 PM   #2
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any ideas?
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Old 08-20-2006, 06:14 PM   #3
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Sounds like you looked at everything but the brakes. Hint. Hint. Any noises if you bounce the back corners up & down.
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Old 08-20-2006, 06:21 PM   #4
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agreed on the brakes, and the bouncing....

its possible that a heatshield could have come loose
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Old 08-20-2006, 06:35 PM   #5
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Quote:
Hint. Hint. Any noises if you bounce the back corners up & down.
I did the bounce test and I didn't hear or feel anything unusual.

Quote:
agreed on the brakes, and the bouncing....

its possible that a heatshield could have come loose
I checked the heatshield, and all the exhaust hangers, they are tight as can be. Remember, The noise occured on a perfectly flat road too.
And I have been having some issues with my rear brakes making a slight rubbing noise, and sort of a metallic sound when i stop in reverse. It feels like they are only doing 1/2 of their job many times. Also, when I take off there is a SLIGHT little clunk comming from the rear area. Maybe this also has something to do with the brakes?

But do you agree that it doesn't sound liek a strut mount going bad? The noise was inconsistant with the bumps in the road. It was really loud too, like a piece of metal was breaking off and knocking another piece of metal. I drove it around some more and I haven't heard anything since.
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Old 08-20-2006, 07:02 PM   #6
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If you don't see anything wrong with the brakes I'd have it checked out where they can put it on a lift & have a good look. Brakes & suspension problems need to be resolved ASAP. Our local Midas shop gives free estimates.
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Old 08-20-2006, 08:10 PM   #7
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Quote:
agreed on the brakes, and the bouncing....

its possible that a heatshield could have come loose
A heatshield on the brakes?
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Old 08-20-2006, 09:34 PM   #8
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Quote:
Originally Posted by marquette97
Quote:
agreed on the brakes, and the bouncing....

its possible that a heatshield could have come loose
A heatshield on the brakes?
no..... a heatshield on the exhaust system, or anything else under there
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Old 08-20-2006, 09:38 PM   #9
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oh, nope, all exhaust parts are tight. This was much harsher sounding than a loose heat shield would sound.

I seriously thought the wheel or something was going to fall off the rear that I pulled over ASAP. I was going about 25 mph if that helps
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Old 08-21-2006, 12:41 PM   #10
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It started a little bit today. When I take off, there is a notiacle creek/clunk from the back, and over awkward bumps in the road, it will make a slight noise, like it wants to do what It did yesterday. All help is appreciated!!!
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