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post #1 of 7 Old 25th June 2018, 09:42 PM Thread Starter
DooRow_88
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Unstable on highway driving!!!

Recently I feel my car like floating/unstable while driving on highway past 80mph. What could it be? I was suspecting I need to replace FCAB but any other opinions? Car currently at 80,000 miles .


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post #2 of 7 Old 25th June 2018, 09:56 PM
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Recently I feel my car like floating/unstable while driving on highway past 80mph. What could it be? I was suspecting I need to replace FCAB but any other opinions? Car currently at 80,000 miles .





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Wheel balancing is often overlooked. Happened with my 2010 Camaro SS.


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post #3 of 7 Old 25th June 2018, 10:30 PM
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Originally Posted by DooRow_88 View Post
Recently I feel my car like floating/unstable while driving on highway past 80mph. What could it be? I was suspecting I need to replace FCAB but any other opinions? Car currently at 80,000 miles .


Thanks
Are your tires ( front or rear ) wearing quickly? My alignment was out on one of my other cars in the rear and it felt like it was floating all of the time till I aligned them. I suspect as the weight would shift when making slight steering adjustments, it would put more load on the other wheel and try to change the direction of the car slightly...the faster I moved the steering wheel back and forth, the worse it was.

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post #4 of 7 Old 25th June 2018, 10:41 PM
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Are your tires ( front or rear ) wearing quickly? My alignment was out on one of my other cars in the rear and it felt like it was floating all of the time till I aligned them. I suspect as the weight would shift when making slight steering adjustments, it would put more load on the other wheel and try to change the direction of the car slightly...the faster I moved the steering wheel back and forth, the worse it was.


Yes, alignment 100%. That and a full road force wheel balance. The car will drive smoothly.


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post #5 of 7 Old 26th June 2018, 01:19 AM
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Get the car on a lift or at least jack up the fronts and rears to try and inspect bushings. At 80mph, an M5 should feel planted. There are a lot of suspension pieces and honestly, the easiest thing to do would be to get under there and try and move some of the arms around or do a visual inspection. Torn control arm bushings could do that.
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post #6 of 7 Old 27th June 2018, 01:49 AM
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Is it just the front? The FCAB mainly feels loose in the front for me. I also have that on my list of maint to do.
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post #7 of 7 Old 27th June 2018, 05:15 AM Thread Starter
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Thanks guys, Iíll definitely check my aligment and put on a lift to see if anything needs to be addressed.


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