93 grinding sound front end both sides when hard turning

Hi all;

My 93 bonneville just started grinding in the front end when I turn into a driveway hard like a 90 degree turn. It does it on both sides I have new cv axles as well as bearings I am stumped to what it could be!

Could a bad motor mount be to blame it is fine on the highway.
My thoughts are a bad motor mount allowing for the drivetrain to move the cv axles out of alignment thus creating the grinding.

Marc

does it sound like metal on metal.... Or something else. Low pitched or higher.

How long has it done it... IE... did you just get your oil changed and start noticing it?? Or has it been going on for longer??

On a hard turn.. if you have the whell turned all the way to the stop, the PS pump might be going bad, thus causing a noise. but it'd do it at a stop too, not just while moving.

If you've just had work done then noticed it.. check the passenger side frame rail where the lower control arm bolts on... there is a plastic shield there that Mechanics pop out to change oil and other stuff, commonly forgotten to be pushed back in, causing a noise on hard turns.

Good Luck.

It is more like a metal to metal grinding sound. Just started last week after I put the new wheel bearing hubs in. I have checked the bearings and cv axles all seem okay.

It is only when I enter my driveway at a 90 degree turn while moving on suspension . Happens in both directions left or right.

I jacked the front end up and put on jack stands then started it up and put in gear. Ran it to about 30 mph and turned side to side no noise.
However with the car sitting on suspension it does it ??

Marc

Ok... Alittle weird.

Does speed matter... a grinding noise pulsates... does it seem to pulse faster if you take the corner faster, or doesn't it matter.

do this test... get a good pair of gloves(Leather)... put the front of the car on jack stands... and block the rear tires.

turn the wheels all the way one way or the other while in drive and let them spin... Very carefully, go to the tire on the side of the direction of the turn... (ie if your turning right, go to the right tire). Then drag your hands on the tire lightly at first to slow it down(Don't worry, you should be able to grab it and stop it with no probs, but you want it to spin alittle). Helps to have a friend there to listen as your not going to hear it over the sound of the gloves on the tires.

I'm thinking it could be something in the trans... with the tires at differant speeds around corners. Slowing one tire while in the air should replicate it if thats the problem. If not.... Then I'm lost.

Good luck... I hate gremlins :banghead:

Thanks I will try that. It only happens when I am at a light or going into the driveway not under normal driving. I am kinda thinking it is the inner bearings in the tranny it has 160,000 on it.

Marc

Dunno... Can't judge by milage. My 92 transport with the 3800/4T60E has 210,677 on her and still running strong.

It makes sense... the bearings won't care weather your turning or not, CV joints make a "Clicking" noise when they fail, and the PS pump would do it at a stop as well as driving. So we can eliminate those.

Another possibility is... Although I'd think you would've seen it already. When you changed the bearing hubs.... did you check to make sure the rims arn't hitting or rubbing on the lower control arm?? or lower ball joint. It is possible you may have a incorrect hub and they might be hitting at full turn. I'd just double check to see if there are any wear marks on the backside of your front rims... Sometimes its the easiest things you check last...lol.

HTH

I put it on the lift this weekend to see if anything was hitting and didn't see anything .

I am at a loss really. Time for a new car! Thanks for the help .
Marc

Maybe a strut going bad?

Well the drivers side strut did leak fluid and has probably all leaked out but would it make a grinding noise when turning??

I disguarded that because I did not think it would make a grinding noise.
Also the dam thing is only 1 1/2 years old and it already leaked unbelievable!

Marc

A strut or strut bushing would make the noise while the wheel was changing direction... once you stopped moving the steering wheel the grinding would stop.

From what I understand you are holding the wheel all the way against the lock, and taking the corner (90 deg. trun) and then the noise happens untill you start to straighten out the wheel comming out of the corner... right??

If you were to just hold the wheel all the way to one side and drive in a circle like that, would it keep making the noise till you pulled out of the cir.??

You are right . I haven't tried the circle thing yet but it probably would grind untill I straightened out.

Thanks for the help.
Marc