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Worn engine mounts. springs clunking around, in their pockets. Loose front disc brake backing plates. It really hard to diagnose a pesky noise. Without hearing it. Front or rear sound?
 

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I’m going to this throw out. a noise, years ago I experienced in my smart car. Couldn’t figure out where it was coming from. Just a guessing here. If you own a 451. There is a little plastic triangular cover on the interior. Had such a rattle. The smart service manager, pulled it off. There was a screw behind that. That had loosened. He tightened the screw, No more rattle.

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Make sure the metal engine cover is completely in its slot. Behind the seat. I changed the oil in my car years ago. I didn’t place the cover all the way in. Kept on hearing a clunking, thumping noise from the rear. It was a subdued noise. Also Hot air, I could feel coming from the rear of hand brake
 
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