Shake rattle and roll

I (and the shop) have been working hard at tryign to get the shakes and
vibrations out of my 2002 SC2. What we thought was a bad tire or untrue
alloy rimnow appeared to be a Service Bulletin issue:

00-T-57A JUN 01 Engine/Powertrain - Vibration at 48 - 54 MPH

See, the front end of my SC would shake mildly at exactly 58 mph, enough to
be annoying for an hour long drive to work. This fix required a dampener
(strut type) to be mounted from the engine to firewall to better brace the
lower engine mounts.

That fixed that issue, but now, the steering wheel vibrates at any speed
over 50 mph.
This sux, especially when driving for a straight hour to work. The tires
have been balanced already, perhaps they need rebalancing?

Has anyone encountered this SB issue? Is it now just a simple alignment/tire
balance issue? ThHhAaanNks....

--
marx404

A tire could be out of round. Have they tried moving tires back to front?

"marx404" > wrote in message
...
>I (and the shop) have been working hard at tryign to get the shakes and
> vibrations out of my 2002 SC2. What we thought was a bad tire or untrue
> alloy rimnow appeared to be a Service Bulletin issue:
>
> 00-T-57A JUN 01 Engine/Powertrain - Vibration at 48 - 54 MPH
>
> See, the front end of my SC would shake mildly at exactly 58 mph, enough
> to
> be annoying for an hour long drive to work. This fix required a dampener
> (strut type) to be mounted from the engine to firewall to better brace the
> lower engine mounts.
>
> That fixed that issue, but now, the steering wheel vibrates at any speed
> over 50 mph.
> This sux, especially when driving for a straight hour to work. The tires
> have been balanced already, perhaps they need rebalancing?
>
> Has anyone encountered this SB issue? Is it now just a simple
> alignment/tire
> balance issue? ThHhAaanNks....
>
> --
> marx404
>
>
>

I shour shoulda waited before posting, lol. I took her to our other shop
which has more modern tire balancing machines, had them rebalanced. One tire
was the culprit and as the older machine could not test road force, it didnt
detect that one of my BF Goodriches has 27 lbs of road force! (I think 14+
is the acceptable margin) .

They were able to counterbalance the tire, we road tested it together and
all seems to be smooth again. Hooray for modern technology.

marx404

How is the wear on the tires? If they are cupped and worn, they will always
cause vibration. Have you had the wheels rotated and did that make any
improvement?
It's amazing how many of these vibration issues have come back to motor
mounts being responsible. I always tended to think struts, top strut mount,
ball joints and A-frame bushings. Has a 4-wheel steering alignment ever been
done? When they do the alignment, they're supposed to check for play in any
of these components first before checking alignment.
Best to get to the vibration resolved since it only will cause additional
wear and stress on other components and cost you.
Oppie

"marx404" > wrote in message
...
>I (and the shop) have been working hard at tryign to get the shakes and
> vibrations out of my 2002 SC2. What we thought was a bad tire or untrue
> alloy rimnow appeared to be a Service Bulletin issue:
>
> 00-T-57A JUN 01 Engine/Powertrain - Vibration at 48 - 54 MPH
>
> See, the front end of my SC would shake mildly at exactly 58 mph, enough
> to
> be annoying for an hour long drive to work. This fix required a dampener
> (strut type) to be mounted from the engine to firewall to better brace the
> lower engine mounts.
>
> That fixed that issue, but now, the steering wheel vibrates at any speed
> over 50 mph.
> This sux, especially when driving for a straight hour to work. The tires
> have been balanced already, perhaps they need rebalancing?
>
> Has anyone encountered this SB issue? Is it now just a simple
> alignment/tire
> balance issue? ThHhAaanNks....
>
> --
> marx404
>
>
>