vibrations

[SECTOR]

Hi all,
993C4 pre varioram 1995.
I am still trying to track down the cause of a vibration I have.
The vibration appears to be and im all most certain its from the rear, it is always there at 80mph + but will sometimes appear at a lot lower speeds such as 40mph, if this happens you bring the car to a halt, stop any forward motion, drive off again and its gone.
Ive have carried out the following:
All the wheels balanced.
Full geometry check - Specialist
Put my original wheels back on.
Had two new rear drive shafts.
New rear discs brakes fitted.

The car has MO30 suspension which has been on at least 1 year.
Could it possibly be the engine mounts. has anyone had to change theres and if so does the engine have to come out.

I think my front brake discs possibly need changing because if you brake reasonably heavy the steering wheels shakes, but I did not worry about this as the vibration from the rear and the car has recently been serviced when the rear discs were changed.

The car is well maintained by a specialist.

 

[Guest]

Engine mounts likely to cause a clunk when you drive off or after changing gear.

I had this problem - I tracked it down to loose heat shields around the silencers. They rust badly over the years. Sometimes they fall out, sometimes not.

Hope this helps.

Roddy []

 

[scaramanga]

ORIGINAL: SECTOR

Hi all,
993C4 pre varioram 1995.
I am still trying to track down the cause of a vibration I have.
The vibration appears to be and im all most certain its from the rear, it is always there at 80mph + but will sometimes appear at a lot lower speeds such as 40mph, if this happens you bring the car to a halt, stop any forward motion, drive off again and its gone.

Sorry if you've already covered this but it could be the rear heat shields ? I used to have a vibration at around 1200rpm, which completely disappeared when i replaced the heat shields (which tend to corrode over time).

 

[scaramanga]

ORIGINAL: roddylennox

I tracked it down to loose heat shields around the silencers

Sorry - hadn't read your post properly! Sounds like we had the same issue... i replaced mine when i added RSRs (but was quoted £700 by a porsche independant just to change the shields!)