Excessive Vibration at 60 and up

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  #1  
Old 11-18-02, 09:03 PM
islandermike
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Excessive Vibration at 60 and up

My 1992 Mazda MPV, V-6, 3.0 with 195.000 miles, is vibrating excessively at and above 60 miles/hour. I feel the vibration coming from the front of the car. I just had the wheels balanced, and had the brake pads replaced. Any suggestions?
Thanks
 
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  #2  
Old 11-19-02, 04:00 AM
Joe_F
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Rotate the wheels front to back. If the problem goes away, then it's wheel/tire related. Possible bad tire, bent rim, poor balance job.

If not, have the suspension checked out professionally for worn parts, including bad wheel bearing/hub assemblies.
 
  #3  
Old 11-19-02, 11:05 AM
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I've had the same problem on my Olds. Stick with it you'll find it. Could be a warped rim or bubbled tire, or it's possible that the balance on the tire is bad.


Was it vibrating before AND after the balancing? If it did it only AFTER, you may have shifted the tire position. Some tire shops use too much lubricant (soapy water) on the tire when mounting. If you brake much more than a moderate stop, the tire can actually spin on the rim an inch or more, which will result in a high-speed vibration.

If it sounds like this is the prob, just take it back and tell the place you think the balance is bad (either way they shoulda caught this when they balanced it, a warped rim isn't too hard to spot to a mechanic or tire specialist).
 
  #4  
Old 11-19-02, 01:35 PM
Joe_F
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The lug nuts could have been tightened too much and the rotor in turn got warped.

Hubless rotors warp like old records when the lugs are overtightened!
 
  #5  
Old 11-19-02, 04:10 PM
davidf
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The impact rachets the garages use tighten the lug nuts too tight.
Ask the mechanic to tighten them to torque specs with a torque wrench because that is the way they are supposed to be tightened.A lot of garages put the first lug nut on and and screw it all the way in to max. torque with the air gun then they proceed on to the next one in the same way and so on.No wonder they are hard to remove when somone has a flat and has to remove the lug nuts by hand with a cross bar.
 
  #6  
Old 11-19-02, 04:33 PM
islandermike
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Thanks for the replies. The problem was already there before I got the tires balanced. I raised the front wheels and checked for play while steering wheels are locked and it has a little play, is that normal? Wheel bearings costs 137 dollars each and I am a little hesitant to buy unless someone tells me that is not normal. I will re-balance the tires and swap front to rear tomorrow. I also found one stud bolt was stripped could that be a factor?
Thanks again...
 
  #7  
Old 11-19-02, 04:36 PM
Joe_F
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Start with the links and posts in my signature file, most notably autolibrary.org.
 
  #8  
Old 11-19-02, 06:20 PM
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Wheel bearings @ $137 each? Are they gold-plated???
 
  #9  
Old 11-20-02, 03:36 AM
Joe_F
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Hub and bearing assemblies...

Welcome to the world of front drive and import, Tow Guy.

No more 20 dollar a set rear wheel drive GM bearings that last forever .
 
  #10  
Old 11-20-02, 05:14 AM
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I confess I've never had to replace a wheel bearing on my fwd Toyotas.
 
  #11  
Old 11-20-02, 05:37 AM
Joe_F
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Takes a long time to wear out but they do.
 
  #12  
Old 11-21-02, 07:25 PM
islandermike
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I finally found what the problem is. One of the tire looked liked it was over inflated because it is worn in the middle and I saw some uneveness to it. I swapped it with one of the rear tires and the vibration is not as bad and I feel it now from the back of the car. This site really works... thanks a lot to everyone...
 
  #13  
Old 11-22-02, 05:48 AM
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Ah, the tires.

You may want to investigate why it's unevenly worn (other than overinflating). I don't know all the possibilities but I know that a misaligned car, bad shocks (so I've heard), etc... can cause uneven wear.
 
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