1995 Geo Metro Intermittent Rumbling Vibration at Highway S

before you replace any CV axles, try this. Drive the car under the conditions necessary for it to make the noise/vibration. When it starts doing it, make a sharp, quick turn of the steering wheel to either direction. (as if you were dodging something in the road all of a sudden) Did the noise/vibration momentarily go away or change at all? We're checking for a bad wheel bearing by doing this. When a wheel brg goes bad, it will growl, groan, moan, vibrate, etc... It will sometimes sound like 'road noise', only amplified.
If the CV axles/joints are failing, you will hear a 'clicking' noise when making fairly sharp turns, either in reverse or going forward. It will usually be worse in one direction than in the other, unless BOTH are going bad. Try checking the wheel bearings first and get back with me.

Jason - Thanks for the reply. I have not been able to intentionally induce the condition while driving on the freeway. Your description of the sound as "amplified road noise" is a better description of the sound plus the vibration is noticeable but not alarming (at least not yet). In past episodes, normal highway lane changes did not stop the noise but can definitely say that there is no "clicking" component to the noise. Making the sharp turns you described in forward /reverse does not get any noises or clicking so the CV joints are probably not that good of a candidate.

I have wondered about the wheel bearings before because they were not listed on any of the normal maintenance schedules I have for the car. In fact the Haynes manual I have only covers the rear wheel bearings and does not even mention the front ones.

Can you recommend a better manual that is reasonable priced? I'll have this car for a few more years before the Ohio road salts gets it. I actually like working on the little thing.

I have no objection to replacing the front wheel bearings. This condition sounds more likely than the CV joints. Somethng is definetly not right. Plus I would rather have it on my repair schedule instead of the reverse. I also had a front wheel bearing go bad on another high miler a few years ago but the rumble/vibration was constant rather than intermittent.

What is your recommendation? What about servicing the rear wheel bearings while I'm at it? Thanks again.
Jeff Black.

[quote:46d6eb5d1c="Jasonray"]before you replace any CV axles, try this. Drive the car under the conditions necessary for it to make the noise/vibration. When it starts doing it, make a sharp, quick turn of the steering wheel to either direction. (as if you were dodging something in the road all of a sudden) Did the noise/vibration momentarily go away or change at all? We're checking for a bad wheel bearing by doing this. When a wheel brg goes bad, it will growl, groan, moan, vibrate, etc... It will sometimes sound like 'road noise', only amplified.
If the CV axles/joints are failing, you will hear a 'clicking' noise when making fairly sharp turns, either in reverse or going forward. It will usually be worse in one direction than in the other, unless BOTH are going bad. Try checking the wheel bearings first and get back with me.[/quote:46d6eb5d1c]

It's sometimes my policy to 'don't fix it if it aint broke', however, preventive maintenence can be worth it's weight in gold. So, if you choose to replace the rear wheel bearings, you certainly won't be going wrong.
Normal lane changes probably won't indicate a failing wheel bearing. I wish I could say 100% that's what it is but, based on the info I'm getting, I can't. Wheel bearings usually won't be intermittent, but if road conditions change, or driving habits or conditions change, so can the noise from wheel bearings. Several factors come into play during normal driving. Could there possibly be TOO much air in one of the tires? That could also create a 'road noise' sound as well as a vibration. If, in fact, it is a wheel bearing, rest assured that it will get worse. When it does, you should have better luck pinpointing it. Try raising the front wheels off the ground and spinning the front wheels by hand. Keep your hands on the tire and turn it slowly in both directions, paying close attention to the feel of the tire. Can you feel rough spots or 'bumps' while you're turning it? Those bumps, at highway speeds, will become a roar and a vibration. Keep in mind that the weight of the car is NOT on the bearings at this time so you may or may not feel anything, even if it IS bad.

Jason - Thanks for your help. Problem solved. Found out how to check front wheels for bad CV Joints from another mechanic friend with more experience. Jacked each front wheel off the ground under the control arm. Both right & left joints were bad. Replaced both in a few hours for $120 in parts, not the $350 the garage quoted. Front end feels good & solid now when driving.

Redid the back brakes over the weekend. Grinding was from a lot of rust powder in the drums which could not get out. Cleaned & painted the rusty pars with something called "Chassis Saver". Have used it several time on this car and it is excellent. I'm a chemist during the day so this is something I can comment on with some knowledge. The rear wheel bearings looked fine so I lft them alone.

The baby car is ready to go for a few thousand more miles. Thanks again for your help.


[quote:54ea35566f="Jasonray"]It's sometimes my policy to 'don't fix it if it aint broke', however, preventive maintenence can be worth it's weight in gold. So, if you choose to replace the rear wheel bearings, you certainly won't be going wrong.
Normal lane changes probably won't indicate a failing wheel bearing. I wish I could say 100% that's what it is but, based on the info I'm getting, I can't. Wheel bearings usually won't be intermittent, but if road conditions change, or driving habits or conditions change, so can the noise from wheel bearings. Several factors come into play during normal driving. Could there possibly be TOO much air in one of the tires? That could also create a 'road noise' sound as well as a vibration. If, in fact, it is a wheel bearing, rest assured that it will get worse. When it does, you should have better luck pinpointing it. Try raising the front wheels off the ground and spinning the front wheels by hand. Keep your hands on the tire and turn it slowly in both directions, paying close attention to the feel of the tire. Can you feel rough spots or 'bumps' while you're turning it? Those bumps, at highway speeds, will become a roar and a vibration. Keep in mind that the weight of the car is NOT on the bearings at this time so you may or may not feel anything, even if it IS bad.[/quote:54ea35566f]