Engine 'bouncing' ! As per a previous post in this thread it sounds
as if the rubbers have perished in one or both ends of what is inaptly
called the 'lower engine mount'...inapt as it is actually a stabiliser
to stop the engine rocking back and forth.
Read this Guide on replacing it..
http://www.forfour.co.uk/forum/index.php?topic=301.0but ensure you obtain the correct part for your car as there is more
than one. (For info see the last post in that thread)
Pulling to the left eh ? The tracking could be out, possibly down to
a wheel being kerbed, or...from a sharp hard bang over a speed hump
or the impact damage caused when encountering a pothole, or even a
worn track rod end ! But it could also be caused by a broken spring.
That can sometime be easily identified by the car sitting lower on one
side at the front, otherwise give it a check over.
Jack up the front of the car, and chock the rear wheels.
Remove both front wheels...then visually checkout both front springs.
If both are ok, then refit wheels, lower the car and go get the tracking
checked and adjusted if necessary.
Unequal tyre wear is another sign of tracking out of alignment, or worn
track rod ends, and even a broken spring.
One 'give away' sign of a broken spring
can be a graunching, grinding
or pinging sound as the steering is turned and the broken end of the
spring digs in to either the upper or the lower suspension mounting
cups of one of the suspension struts.
As for a strut top mount needing replacing.....hmmmm...possibly...
but I've not seen any needing replacing in all the years I've been
in or around the vicinity of S2smarts. Mind you, the 454's are now
15+ years old...so it may be 'their time' to start showing up.
However, unless you have the time, experience and tools to dismantle
the front suspension (including removing the pads and calipers) to
check them out, then I would strongly suggest you get those...in fact
ALL of the possible symptoms checked out by a Smart 'indie'.
To be perfectly honest, for the time it would save you as opposed to
the time it would take them to do it I would have your car checked
over by them...AND...whilst its up on the hoist have them also
change the lower engine stabiliser bar and...the rear brake caliper+pads.
Well worth it for the time and effort it would save you.
I'm not sure if every 'indie' has the facilities to check tracking, but
you can always ask.