Strange boing Noise when cornering or uneven ground

Brian23

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Hi I was driving my wife's 1999 230 SLK the other day and when you corner or go over uneven ground, there is a boing noise from behind could be in the boot/boot lid or outside. I've looked in the boot and at the rear springs, but nothing obvious. Any Ideas?
 

LostKiwi

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Nothing rolling around in the boot or under the boot floor?
No broken springs (can be hard to see as they usually break on the bottom coil)?
 
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Brian23

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No nothing in the boot anywhere and MoT today, so spring check. It has actually been doing this for a couple of years and been through a couple of MoT's. I only try and find it when I drive it. It is as if a tension bar, as in the old style boot lids is moving, but, non on this car. It is not like a clunk. It's a slightly prolonged sound.
 

antijam

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Sounds very like a broken rear spring. As LostKiwi points out, they can be very difficult to see since the failure is almost always the bottom coil which, after a few years, ends up sitting in a poultice of salty mud and corrosion inevitably takes its toll.
 
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Brian23

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Just this morning passed it's MoT and I cannot see anything wrong with the springs either when it is jacked up.

19 Years old and only failed last year due to the headlights needing to be polished.
 

M80

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I'm not familiar with your mo mo but had similar with Larisa'a Jeep,
turned out to be the rear A fame centre bush. Difficult to access and above other parts it was diifcult to diagnose.
 
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Brian23

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I'm not familiar with your mo mo but had similar with Larisa'a Jeep,
turned out to be the rear A fame centre bush. Difficult to access and above other parts it was diifcult to diagnose.
thank you
 

antijam

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This is where my SLK spring failed, and I couldn't see the fracture until it was removed. My car too had passed an MoT with the 'boing' present - but obviously not audible during the test.

P1040300.jpg
 

Blobcat

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My smart passed it's MOT also with both front springs broken - Drivers side (pic below) at the bottom and passenger side at the top. Not visible only a clicking when turning.

Smart.jpg
 
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Brian23

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I'll take another look tomorrow.
 

Uncle Benz

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If you look at the wishbone where the spring sits down into the recess you can sometimes see a rusty or shiny mark where the spring has been rubbing on the wishbone. A break at the lower end, or sometimes just excessive rusting of the lower part of the spring means it won't sit central in the wishbone hole, and boings on the side of the wishbone hole when the suspension goes up and down.
 
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Brian23

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Thank you I will take a look.
 

Yugguy

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Zebedee is hiding in your wheel arch.
 
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Brian23

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