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Old 27-11-2016, 06:58 PM
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Ok I'm stumped

I have a low speed vibration in the Buick. I've been slowly replacing known worn parts. Driveshaft unis replaced. Tie rod ends replaced. Upper all joints replaced. Lower ball joints replaced today. New tyres balanced and aligned (front only)

Vibration only occurs above 20kph and stops at around 40kph

Does not vibrate through the steering wheel. The whole car vibrates. It very very noticeable and makes the windows rattle (oh that's another thing I need new window rubbers). But back on vibration. I'm stuffed if I know what it is.

Any ideas ????
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Old 27-11-2016, 07:06 PM
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Had basically the same problem years ago. It turned out to be the water pump. So I would check all rotating engine driven parts. I usually run vehicle up to speed on stands or hoist to help diagnose problem. Hope this helps
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Old 27-11-2016, 07:34 PM
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Don't drive under 40kph

Tailshaft balance
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Old 27-11-2016, 07:49 PM
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Bent rim..
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Old 27-11-2016, 07:56 PM
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Tailshaft and rim both considerations, not sure why tailshaft would go out of balance, rim possibly, have scrapped a few curbs but nothing hard

Water pump hadn't thought of that...might be a good place to start
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Old 27-11-2016, 08:41 PM
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Check your transmission mounts as well
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Old 27-11-2016, 09:09 PM
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Did it happen suddenly Chris or slowly get worse? If the rims are the same size swap them back to front to see if it vibrates the steering.
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Old 28-11-2016, 05:29 AM
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Been getting gradually worse, I mean over past 12 months

Unfortunately Ken 20's on the rear and 18's on the front. The Camaro rims (17's) have same stud pattern and will clear the calipers. I may swap them on for a day to see if it is the rims. I did think of that yesterday.

Rodney, they were checked some time ago but will check again.
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Old 28-11-2016, 06:07 AM
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If it's gradually getting worse, it may not be an imbalance, but a tire that's developing a bulge or tread delamination etc.. Have a look.
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Old 28-11-2016, 06:35 AM
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Thanks Steve, fronts are brand new so I know it's not those. Rears look fine, as I did check them recently adjusting the rear brake shoes, but will do another check, as it was more than 3 months ago and that's when it started getting worse
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Old 28-11-2016, 06:41 AM
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Quote:
Originally Posted by guffer View Post
Don't drive under 40kph
In Melbourne ? More like stay under 20kph.

Did you do the LS swap ? If so, tailshaft , pinion angle etc. ? Tailshaft put in backwards ie. Front to back ?
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Old 28-11-2016, 07:07 AM
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Frank swapped the Nailhead for a SBC. Done over 50,000 miles in it, the vibration only started about 15,000 miles ago, so angles should be OK.

Got a few things to try. Today I'm going to;
1. Run it down the hill in neutral both engine running and not running and see what happens. I live right on a hill that's reasonably quiet so easy test
2. Run it for a short distance with the fan belt off to see if the water pump is the issue

will do those 3 tests before next level of diagnosis
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Old 28-11-2016, 07:56 AM
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Only time I've had a vibration of that description was tailshaft & unis. Good luck!
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Old 28-11-2016, 08:04 AM
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Uni's replaced not that long ago so fingers crossed they haven't gone bad again, but certainly on the check list of next things to check
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Old 28-11-2016, 08:56 AM
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Have you revved out of gear? To see if it is engine related
Might be a harmonic balancer letting go?
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