rough idle vibration resolved - 2004cs @75k

[rpcc]

Replaced all of the engine mounts - lowers, dogbone plus the transmission mount.  There is still a small idle drop when coming to a stop, but it's no longer transmitted through the car.  

 

completely different car.

 

 

 

[Scott C]

When I had my '05, it did the same thing and it drove me crazy.  It was worse when cold.  I wish I could have found root cause and fixed it.

[clarksongli]

10 bucks says it was the dogbone mount only.  all of the other mounts are under constant load (weight of engine/tranny).

 

fyi i just replaced mine as well.  i broke it last year and just left the bushing messed up.

[bigbuzuki]

Engine mounts sag after a few years transmitting vibes through to the chassis.

Changed mine 12 months ago, vibes were gone.

[deilenberger]

I seem to recall reading somewhere that doing the front mounts requires removal of some large components (subframe? engine? whatsizt?)

[bigbuzuki]

I had the dealer do mine.

Mounts can be changed without major component removals.

[ALEV8]

When did everyone cave and do do this???!!!!

What did it run and she nice when can it be done without dropping the subframe?

[rpcc]

Wish I did it earlier - the car is vibration free.

 

With all porsche parts and independent shop labor, the cost was 900-1000 USD.

 

The labor was 5 hours.

 

Good luck.  If I had a cayenne with vibration when I started the car, I'd change the mounts.  Might be worth starting with the dog bone mount first - its the least expensive one to do.  I did the dog bone, the two lowers and the transmission mount - vibration is gone.

Edited December 18, 2015 by rpcc

[ALEV8]

I did the dog bone straight away.

Next those **** engine mounts.

If one is replacing tire rod ends and sway bar end links and bushings I can knock it all out at once.

Might as well. Upper control arms too!

[SpawnyWhippet]

Are there any tricks to doing the lower mounts? I just changed the engine mounts on my 09 Audi A5 and 03 Merc SL500, both of them were easy on one side and a total nightmare to do the other side.

[SpawnyWhippet]

Engine mounts on the Turbo need engine out to change. I had perfect access to my drivers side engine mount when I pulled the turbo, but there was not enough clearance to get the mount out the subframe - the built in threaded bolt prevented it from being removed.