Help with noise diagnosis

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Old 08-02-05, 06:26 PM
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Help with noise diagnosis

Chevy Metro 2000. While driving a clunking sound can be heard from the rear espcially going over bumps. Sometimes it happens contantly while driving on the freeway. Recently serviced the whole brake system (front disc and rear drum) - found no problems there. Did an inspection of the car from below and did not see anything loose or broken.

Another thing I notice is that if the rear is lifted or compressed a creaking noise can be heard. I suspect it is from the suspension. Could it be either the rear shocks or the springs. Can worn shocks cause this kind of noise.
 
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Old 08-04-05, 02:48 PM
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Dead shocks can and so can worn out suspension bushings for the control arms
 
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Old 08-04-05, 04:00 PM
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Could not see any problems with the bushings so I guess it may be the shocks. I have a split bushing on the driver side front lower control arm but that has been there for a while before this noise started. Been meaning to replace it for some time. Need to get a hold of a metric bushing driver set

Thanks for the input
 
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Old 08-04-05, 05:17 PM
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How's the sway bar bushings and end link bushings?
 
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Old 08-04-05, 05:49 PM
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Looked OK to me - unless I missed out looking at some specific angle. I will check again.
 
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Old 08-05-05, 08:08 AM
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Have you put the car up in the air and then grab the tire from the edges and tried to move it side to side or up and down.
 
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Old 08-05-05, 09:27 AM
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Hmmmm..can't say that I specifically did that. I did just a few weeks ago service the rear drum brakes and at that time inspect the wheel bearings, drum, shaft and all the brake components - everything looked fine. I did not spcifically move the wheel in the way suggested - I'll try that and see also.
 
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Old 08-07-05, 01:37 PM
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OK so it seems like the noise is coming from the rear left spring. I had someone move the car and if I put my hand on the spring it vibrates along with the noise. Maybe there is a problem at the mounting points on the springs.
 
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Old 08-07-05, 01:58 PM
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Check the upper strut bushing, I have seen this problem before. Possible rock in the spring, we've used a rubber tire tube to keep the rocks out. The spring may have a small fracture, this will cause a problem.
 
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Old 08-07-05, 04:01 PM
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Thanks - will check all of these as suggested. Any way to be sure if it a fracture - is it always going to be visible.
 
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Old 08-07-05, 04:47 PM
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Not always visible. Where are you located? there has been a problem with salt and lack of coating on spring causing a corrosion problem leading to a fracture.(unlikely) is possible. you may have to replace the spring.
Originally Posted by rav12
Thanks - will check all of these as suggested. Any way to be sure if it a fracture - is it always going to be visible.
 
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Old 08-07-05, 11:28 PM
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Southern California so I don't think the salt theory applies here. I did a careful inspection of the spring today and could not see anything wrong. Of course it did not make any nooise while I was looking at it today. Could not see any rocks or any damage to the rubber inbetween the spring and the body.
 
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