I have a '99 SLK 230 with 159k miles which has always run very smoothly. Over the past month, there is a farily loud vibration (I can feel it on my feet as well) that seems to come from the front-left side of the car when I decelerate (ie take my foot off the brake) while going 60-80mph. If I accelerate, it goes away immediately and drives smooth as silk. If I disengage the clutch, the sound goes away immediately as well. It would seem that something is loose, but I have no idea what.

Any suggestions would be greatly appreciated. I search for "vibration" in this forum but found nothing related.

Thanks much,

Sam

 

1. Exhaust to gear box bracket failure?
2. Propshaft doughnut partial failure?

 

Hi all,

Just for purposes of expanding the knowledge base here, I wanted to post what the issue turned out to be. I brought my vehicle to a local mechanic and he tested it and found it was the engine mounts (they were broken somehow). He replaced both of them ($120 each) plus $130 labor--so not too painful at all. The car runs and idles like a dream now--amazing. Can't even tell the engine's on when at idle, before it was pretty bad--the hood even vibrated, and if I turned on the a/c, it got much worse. All fixed with new engine mounts. Just an FYI.

Thanks,

Sam