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  #1  
Old 12-12-2011, 02:15 PM
scoodidabop's Avatar
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Join Date: May 2006
Location: Houston, TX
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1990 300SE Rear end popping/clunking

Well I thought this awful noise was coming from the front of my car but it seems to be coming from the rear passenger wheel. Whenever I make a right turn and apply the throttle (it eases up or completely disappears when I let off the gas and/or turn left) there's a consistent loud pop/clunk sound coming from that right wheel. I can't really see any obvious damage and all the rubber boots look good. My friend who's a pretty decent mechanic said it might be the axle. Any ideas? Where should I start? It seems tricky to narrow down with the car on a jack since the throttle pressure seems to cause the issue.

If there are any gears in the rear suspension that have become worn down, that makes sense that they would slip in and out with increased throttle pressure, thus causing the popping sound. Replacing everything back there seems like a sure-fire way to remedy the problem but I want to keep costs down on this job by replacing only the broken part.
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  #2  
Old 12-13-2011, 06:29 PM
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Location: Queens, NY
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just because the axle boots look OK doesnt mean they are ok. Could most likely be the axle but check the spring, sway bar end link and shock.
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Old 12-14-2011, 01:18 PM
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It's a bit of work, but certainly the cheapest way to diagnose the axle - just switch them left-right. Then see if the problem changes sides. They are totally interchangeable.
Trailing arm bushings usually last a long time, but they are hard to diagnose with the spring pressure on them. best way to really check the suspension bushings is to compress the spring and take the load off everything, then it gets real easy to find looseness.
Of course, check the bearing and brake mountings also.

DG
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Old 12-17-2011, 03:41 PM
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Sounds like an axle, not a bushing/arm.
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