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PostPosted: Fri Mar 25, 2011 8:41 pm 
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Joined: Wed Mar 23, 2011 9:44 am
Posts: 20
Year and Trim: 2001 Bonneville SSEI
Working on ironing out all the quirks of the new bonneville, took it on the freeway for the first time and noticed above 50 mph the steering wheel / front begins to shimmy/vibrate - not a violent shake. Recently replaced the struts and there was no excess steering part movement. Also, the front motor mount was falling apart and was shaking at idle, fixed that. I rebalanced the tires, no change. I noticed this is a common problem, but I don't see any real solutions. I dont want to start throwing parts around if someone can guide me in the right direction. Thanks.


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PostPosted: Fri Mar 25, 2011 11:49 pm 
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Certified Bonneville Nut
Certified Bonneville Nut

Joined: Sat May 24, 2008 5:18 pm
Posts: 4938
Location: Sycamore, IL
Year and Trim: 05 Chevy 'Hoe
1997 'maro (3.8L M5)
89 SkiDoo
Was the rest of your front end shaken down?

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00Beast wrote:
Less off-topic than Lane's Heated Steering wheel, but yeah, back to the topic.


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PostPosted: Tue Mar 29, 2011 11:52 pm 
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Posts like an LG3
Posts like an LG3

Joined: Thu May 22, 2008 10:29 am
Posts: 347
Location: Winnipeg, Manitoba
Year and Trim: 2000 SSEi
Every available option
dematka wrote:
Working on ironing out all the quirks of the new bonneville, took it on the freeway for the first time and noticed above 50 mph the steering wheel / front begins to shimmy/vibrate - not a violent shake. Recently replaced the struts and there was no excess steering part movement. Also, the front motor mount was falling apart and was shaking at idle, fixed that. I rebalanced the tires, no change. I noticed this is a common problem, but I don't see any real solutions. I dont want to start throwing parts around if someone can guide me in the right direction. Thanks.


I have been trying to figure this problem out for many years. Just about the only thing I haven't replaced in the front is stuts and strut mounts. 190,000 miles on my car. I wonder if a GXP strut brace would help, hmmmm.

If you can live with it I would say save yourself a lot of money chasing it like I did. You find speeds at which it's less obvious.

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Mark
The Familyman's Trans-Am
Intense 3.4 MPS, Intense FWI, Intense PCM, copper NGKs TR55's, MSD wires, MSD coils, BWD ICM, MagnaFlow High Flow Cat, drilled 180 'stat, solid front mount, Monroe Max Air rear shocks, Moog rear mounts, Moog suspension bushings, cleared front corners, 190,000 miles
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Last edited by golfyeti on Tue Mar 29, 2011 11:57 pm, edited 1 time in total.

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PostPosted: Mon Apr 04, 2011 7:56 pm 
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Joined: Wed Mar 23, 2011 9:44 am
Posts: 20
Year and Trim: 2001 Bonneville SSEI
I've noticed this is a HUGE problem with these cars...etc. But no one has a SURE FIRE solution that solved THEIR problem. Being I don't know the most about these cars I was hoping someone could point in a direction - oh well, time to go my own direction. My struts were bad anyway, so they got replaced, helped the ride, not the shimmy. Next plan is to replace the side motor mounts - they are horribly rotten, then road force balance the tires. After that, there isn't much left but something vibrating in the trans??? My car only has 137k miles, but the previous owner put on tires which I don't categorize as high quality, but they balanced out without much weight so I don't really think the road force balancing will do much but gotta start with the cheapest fixes... Thanks for all the feedback...


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PostPosted: Mon Apr 04, 2011 10:47 pm 
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Joined: Wed Mar 09, 2011 6:34 pm
Posts: 160
Location: marion, Illinois
Year and Trim: 2002 pontiac bonneville ssei
I have the same shake. I've changed rims and tires and that didn't help so I went back to the rims and tires I have now. I've checked inner and outer tie rods. Ball joints. Thought the steering shaft but was told that wouldn't do it by the dealership. I'm thinking maybe the rack and pinion. Don't the ssei models have something like a magnasteer? If so can that be malfunctioning?

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PostPosted: Sat Apr 16, 2011 2:05 pm 
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Joined: Wed Jan 20, 2010 8:58 pm
Posts: 60
Year and Trim: 2003 Pontiac Bonneville SLE
dematka wrote:
I've noticed this is a HUGE problem with these cars...etc. But no one has a SURE FIRE solution that solved THEIR problem. Being I don't know the most about these cars I was hoping someone could point in a direction - oh well, time to go my own direction. My struts were bad anyway, so they got replaced, helped the ride, not the shimmy. Next plan is to replace the side motor mounts - they are horribly rotten, then road force balance the tires. After that, there isn't much left but something vibrating in the trans??? My car only has 137k miles, but the previous owner put on tires which I don't categorize as high quality, but they balanced out without much weight so I don't really think the road force balancing will do much but gotta start with the cheapest fixes... Thanks for all the feedback...


ive had this same problem in my o3 bad, after changing parts to no avail, i found...assuming front end is tight and wheels arent bent or anything. clean hub surface, inner and outer rotor surface, and wheel flange mounting surface, balance tires, and torgue lug nuts to 100 ft lbs, cured my problems for good. try it!

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2003 Pontiac Bonneville SLE - Sylvania Silverstar Fog lights, 5000k HID conversion low beams, Disabled DRL, cranking headlight delay kit, GXP style exhaust tips, solid front mount. Approx. 86k miles and still kickin strong!


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PostPosted: Mon Jun 13, 2011 8:43 pm 
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Joined: Wed Mar 23, 2011 9:44 am
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Year and Trim: 2001 Bonneville SSEI
Problem solved - road force balanced. Didn't think it would work but it did.


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PostPosted: Mon Jun 13, 2011 8:49 pm 
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Certified Bonneville Nut

Joined: Sat May 24, 2008 5:18 pm
Posts: 4938
Location: Sycamore, IL
Year and Trim: 05 Chevy 'Hoe
1997 'maro (3.8L M5)
89 SkiDoo
dematka wrote:
Problem solved - road force balanced. Didn't think it would work but it did.


But now when you rotate your tires theres a chance it will come back.

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00Beast wrote:
Less off-topic than Lane's Heated Steering wheel, but yeah, back to the topic.


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PostPosted: Tue Aug 21, 2012 7:12 am 
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Joined: Tue Aug 21, 2012 6:52 am
Posts: 1
Year and Trim: 2001 Pontiac Bonneville SE
I had the very same problem, shake at highway speeds. After trying everything a friend told me it was the clutch in the lock-up torque converter. Found a low mileage wreck at the local junkyard and replaced the transmission and installed a new converter. Now it's smooth as silk. If you don't replace the transmission make sure to flush the old one out, as the particles from the clutch can get into the transmission and cause more problems later on. Try everything else first because this is a lot of work.


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