Hi all- I'm a newb here, but not a newb to forums so I did do a search first and was unable to come up with anything specific related to my problem.

I'm the proud new owner of a '92 240 GL with 184,000 on the clock, I'm lucky enough to be able to get one from someone who loves these cars as much as I do, as a result it's in beautiful condition overall and has been well-maintained.

Cutting to the chase, There is a rattling sort of sound coming from directly beneath my feet it seems whenever I go over some train tracks or a really lumpy piece of road. I can feel a bit of vibration there too. It's not a hollow metallic clanging like exhaust, it's more of a dull rattle. I'm no expert, but to me it sounds like something solid rattling in place, I suspect it's a suspension component of some kind (?)

Sorry I don't have more information, any ideas as to where I should begin looking? The handling and steering of the car seems to be just fine (by 240 standards I mean)

 

Check the rear lower control arm bushing. Those commonly go and cause a noise like that.

 

That happend to my 240dl.... turned out it needed a new cat converter.

 

speaking of the catalytic converter, lets say there were a high-frequency rattle from under the passenger side, seemingly from the location of where the cat is located below. this rattle comes on at about 60mph+ and when in deep deceleration, or coming down from a high rpm by means of simply letting off the throttle. what would be the best way to check to see if the cat converter surely needed replacment?

 

The best way to check is to climb under and Tap with your hand or a rubber mallet.

If it is bad you will hear it rattle when you hit it.