Aero wagon w/slight shimmy at speed - The Saab Link Forums

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Old 04-02-2005, 04:28 PM   #1
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Aero wagon w/slight shimmy at speed

I've just recently purchased a 2001 Aero Wagon with original Aero wheels and a set of new Michelins. The car is great up to 110 km/h or so, but anywhere between 115 km/h and 140 km/h there is a very very 'slight' shimmy (I can only further describe it as un-smooth or driving over mildly rough pavement) - felt both via steering and seat with a very low, "spinning washing machine" sound - just enough to make a long drive at those speeds uncomfortable (and a bit unnerving not knowing what it is).

The car has been back to the dealer 3 times for wheel balancing. The last time they replaced one of the wheels, both front rotors and did a really fine tune on the wheel balance machine. While I did get a slight improvement, the problem is still there.

I feel like I'm being picky, and this is the first time I've owned a car with performance wheels and tires (I had an '02 Volvo Cross Country before the Saab).

What should I do?
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Old 04-02-2005, 11:46 PM   #2
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It does sound like the tire mounting went bad somewhere.
If you do go back again try to get them to remount your tires, I had the same shimmy problem, but after new tires its gone. Or maybe a bad tire?
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Old 04-02-2005, 11:54 PM   #3
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yeah man, if they know the rims are not bent and the axles are not bent it has to be a tire. take that shit back and make them do it right, test drive the car before you pay and or leave the dealership and make sure the problem is gone.
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Old 04-03-2005, 06:11 AM   #4
 
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One of those front tires could be defective. Switch the rears to the front and do a road test.

A front wheel with a slight dent will definitely cause annoying vibration at speed. This happened to my current set of winter wheels, so I put the fronts on the rear and I've been problem free...
If you can get a service history on the car, check to see if any of the front suspension components were replaced, or if a tire/wheel was ever replaced at the dealership. That could indicate the previous owner whacked a curb pretty hard and may have bent something. This is probably very unlikely, but still worth checking.
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Old 04-03-2005, 09:36 AM   #5
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Aero wagon w/slight shimmy at speed

Thanks guys. I've lost faith in the dealership to resolve the problem - I drive away and it seems OK, but then a few days later, when I get to cruise a long stretch of open road, there it is again.

Are there shops that can do the diagnoses you've suggested above in one shot (axle, wheel, tire , etc...) and be able to rebalance the wheels with a road-conditions-type test (preferably one that can reach simulated speeds between 110 km/h and 140km/h+)? Maybe another dealership? Up here, the dealerships are Saturn Saab - emphasis on Saturn.

I'm thinking I should simply replace all the wheels, or get the old ones 'touched up' (rebuild or fix scuffed rims).
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Old 04-03-2005, 01:17 PM   #6
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Hey gravy welcome to the site,
I see you're from toronto...what dealership is it that you take it to?
I've had bad experiences with Midtown....Thornhill saab is the best bet and the favorite around here, I can also reccomend some of the best independant saab garages in GTA.
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Old 09-17-2005, 07:25 PM   #7
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Same problem.
the stock aero wheels shimmered around the same speeds you are mentioning.
we went through 3 sets of tires and countles trips back and forth to get the wheels re balanced.
if you have the resources check your rim with a Dial indicator gauge..
if u cant get a hold of one of those.
you may be out of luck in knowing your problem.
also it could just be the fact that since you said u have summer tires on the lower and stiffer sidewall is transferring more vibrations into the car. try lowering your tire pressure as a last resort to around 30-32 P.s.i. tire wear may be a bit worse, but it should 'moosh' up the ride somewhat.
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