Car vibrates over 80 KM/H - Engine and Car Noises


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Car vibrates over 80 KM/H

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Auto Repair Home>> Automotive Repair>> Engine and Car Noises

ive099
New User

Dec 6, 2007, 3:21 PM

Post #1 of 4 (3946 views)

Car vibrates over 80 KM/H	Sign In

Last year I spun out exiting the highway. I ended up in a snow bank. I took my car in to the shop and had the minor cosmetic repairs done. I also explained how after that incident I felt a vibration that occurred around 80KM/H. They checked the alignment and it was okay. I know it's not a problem with the engine as I have shut the engine off and still felt the vibrations. (I know probably not the wisest thing to do) And I do not think it is the tires as I have felt it with both my summer and winter tires. (I had the winters on when it first happened.)

The odd thing is the problem is really noticeable when the weather is cold. There is no real sound just a vibration. almost like a speed wobble, but when it's warmer it does not happen.

I have a Mazda 3 sport (2004) Automatic

If anyone has any ideas I'd appreciate hearing them!

Thanks!

Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Dec 7, 2007, 2:08 AM

Post #2 of 4 (3944 views)

Re: Car vibrates over 80 KM/H	Sign In

Alignment does not generally cause a vibration. Wheels and tires do. You said they have been changed. Are you changing just the tire or a wheel with a tire mounted on it? If a rim is bent or out of true it can cause a problem and sometimes the tire will wear into that problem and when changed it shows up. Have the wheels (the metal part of the rims) spun and checked for run-out and balance is important as well. Again if a tire has been run out of balance long enough it will wear into that and just balancing it won't solve the whole problem. Both have to be right at the same time. Rare on smaller cars but rotor (brake) balance and trueness can be a factor that isn't really checked by balancing the wheels and tires.

Odd but most out-of-balance problems show up at about 60mph which is close to your 80km/h and may seem better at higher speeds,

T

ive099
New User

Dec 7, 2007, 8:25 AM

Post #3 of 4 (3940 views)

Re: Car vibrates over 80 KM/H	Sign In

Hi Tom,

I have a totally different wheels and tires for the summer and winter. I think I will start with balancing the tires and checking the wear like you suggested. The rear breaks were recently replaced (due to normal wear) both pads and rotors.

Could a bearing problem cause this type of issue?

Thanks

Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Dec 7, 2007, 9:38 AM

Post #4 of 4 (3939 views)

Re: Car vibrates over 80 KM/H	Sign In

If you get this with totally different wheels and tires they shouldnt be the cause. Near always wheel bearings make some noise but it's worth checking if they have any play. These should not be (not sure) the type you adjust to the right spot with no looseness felt just jockeying the wheel/hub and that type can by quiet, a bit loose, and make it feel like an out-of-balance problem.

Wheels and tires are still not perfectly round or in balance so the slightest amounts off will show up when anything is wrong or marginal like worn joints, strut/shock mounting parts - whatever is holding the wheel securely in place will make itself worse at some speed.

I've also had tires with soft spots that don't show out of balance or trueness but with weight on them the spot behaves differently when it hit the road but you said you have different tires doing the same thing so that just isn't likely. The brake parts that spin are rotors and drums when used and they only get balanced when new for the most part but you said you had new rotors in the back. That problem did happen with big old cars with cheap/unbalanced brake parts or when chunks of rust fell off at different rates/spots.

Most drum/rotors now just fit onto the hub and there has been problems with junk between them setting off the trueness of the whole wheel and tire if that spot/area is not clean and free of rust. That you can about see by just spinning that wheel all intact and it's wobbling out of true a bit or a lot in some I've seen.

All this is worth checking,

T

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