Engine Vibrations at low speeds

[MalCay]

Have '04 Cay S with about 94k miles on it. Since the last 15-20k miles a vibration in the car is getting stronger and stronger. It occurs when braking and getting to a stop and remains while standing. It stops when I continue to drive after for example a traffic light. I had the car at local Porsche service and was attested, brakes are not at fault. They pointed to the upper engine mounts and replaced those. It did not help at all. They went at their expense thru all the cleaning of injection system and exchanging of hoses. Car runs much better, but the vibrations are still there. Harmonic vibrations maybe the reason and they had no way to fix them. Mind you these are not just small vibrations, it makes loose change rattle on the console. Frankly, very annoying. Anyone with similar problems, better yet: with a solution?

Thanks

[wvicary]

I would inspect the main engine mounts, they might be collapsed.

[Loren]

+1 on engine mounts

[MalCay]

Thanks! The upper mounts replacement wasn't too expensive, but do you know a ballpark for the main mounts? Sounds to me that much more labor is involved. Couldn't do it myself I have to go to a dealer-ship.

[MalCay]

I have a quote to get the lower engine mounts replaced for about 900, is that reasonable? And is there something else I should let be fixed/exchanged at the same time? Still hunting down this pesky vibrations...

[bigbuzuki]

Could be wise to change the transmission mount as well.