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Knockin' sound [saabnet.com]
Posted by Satoru - http://saabnet.com/tsn/forms/e.php3?em=18 (more from Satoru - http://saabnet.com/tsn/forms/e.php3?em=18) on Tue, 19 Oct 2004 23:42:54

Hi everybody,

For a few months now, my '95 9000CS has had this.... I don't know a good word
to use here, but... 'knocking' or 'crunching' kind of sound that it would
make when I accelerate or decelerate the car. The sound would tend to come
from around the frontish of the car, somewhere below my two feet.

It feels 'structural', in that, it's as if some part of the body of the car
is 'popping' (like a joint?) when accelerating the car, because the FWD is
pulling the front of the car, and when I decelerate, it's popping back into
place. Usually the sounds will be in succession of 2 or 3, rather than a
single 'pop', but that does happen at times. The sound isn't super loud, but
it's very audible nonetheless.

I also get a popping sound, 2 to 3 times in a succession, when I'm steering
to the left or right extreme... i.e. when I have the wheel turned all the way
to the left (or right), like when I'm pulling out of the driveway or out of a
parking spot. The popping sound I get when I ac/de-celerate is similar
(although maybe not the same) to this sound.

I took it in to Mecca Motors in Brighton, MA where I always take my car and
asked them to take a look. I also had a rattling exhaust (or something) at
low RPM problem and told them to fix that as well. When I got the car back,
they told me there were some loose nuts&bolts and that they fixed the
problem. I thought 'great!' and drove the car away, only to find out that the
rattle had gone away, but this popping/knocking/crunching thing persisted.

Now, perhaps I don't need to worry about it because they didn't do anything
about it. What do you think? Any help, as always, is greatly appreciated.

Specs:

'95 9000CS
189,200 miles (w/ a swapped '95 Aero engine with about 100,000 miles on it)

In July, it got a major (nearly cost $1,000) operation, replacing some
seal(s)? after I found the car leaking oil and/or steering fluid. This
happened just as I was leaving the country for a month. When I got back to
the US (my wife had been driving the car for a while, but she knows less
about cars than I do, which is super little), all sorts of things were wrong
with the car.... the front wheels had like nearly 50psi and the rears only
22psi air (!!!), the transmission would often slip going from 2nd to 3rd,
there was that thing rattling/jangling at the bottom of the car at low RPM,
and this knocking kind of sound. I caught the air thing after a couple of
days of driving (it just didn't feel right) and got the transmission checked
out and the mechanic fiddled around with the..what was it called?
Down-shifting wire? All of this, including the surgery, was done at a place
on Long Island, NOT at Mecca Motors, BTW.

Thanks,

Satoru
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Posts in this Thread:

StateOfNine.com
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