Tracking down source of vibration on accelleration...

[Gerard <gerard@poboxes.com>]

Hi!

Just got back from Norsche Motors. They're another VW/Audi/Porsche
monkey-guy store. I went in to have my engine and tranny mounts
checked. This involved (surprise! surprise!) a diagnosis by test
drive! The guy drove the car and did as I told him, he accellerated
and a big shudder from the left of the car happened. He told me
immediately that the cause could be the inner CV joints. When standing
still with the car in gear the shudder can be felt. I almost begged
them to physically check my engine and tranny mountings. The guy said
he could check to see how much "play" the mounts were giving if I
held down the brake, put the car in gear and revved the motor while
he watched how much the engine moved in the engine bay. This we did and
the motor did move up and down by quite a bit. He suggested what
might be happening is that the tranny mount is buggered and when I get
on the gas the unit moves enough to offset the alignment of the CV
joint which sends out a huge shudder. Could this be the case?
Why do people check engine mountings by  driving the car instead of
physically inspecting them? What is the procedure that I can tell the
mechanic to do in order to test the engine and tranny mounts?

Also, I told the guy my brakes were a bit bad. Told him about the
shudder I had on the pedal and the sudden stiffness it showed when the
car was switched off, ie. all signs of dead bomb, and he pipes up that
that is perfectly normal for the car and nothing wrong with it. It
is even like that on the early A6 cars as well.

G.
-- 
"a thousand miles from here, there is another person smiling"
1990 Turbo (200t, MAC13A ECU, 1.4-1.6 bar, FWD auto)
name   : gerard van vught
tel    : +27-21-696 0331 (h) / 082 923 9609 (cell)
url    : http://homepages.acenet.co.za/gerard/
e-mail : gerard@poboxes.com  / han.solo@galaxycorp.com