RE: bearings or bad tire?

["Funnell, Richard" <Richard_Funnell@nai.com>]

     Eric,
     
     Not sure if this is the same problem, but when I had new tires 
     installed on my urQ I had to go back 3 times to get them balanced 
     properly.  It turns out the car is extremely sensitive to balance
and 
     they had to set their machine to its most sensitive position.  
     
     Richard


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Subject: Re: bearings or bad tire?
Author:  "Gabor Horvath" [SMTP:horvathg@apacs.pote.hu] at NA-Exch1
Date:    3/15/98 11:20 PM


Eric,
     
I have the same symptoms on my 85 q Coupe. I had it with the previous
set of 
wheels, too. Still couldn't cure it and would be greatful if anyone
would 
suggest a good move.
     
Regards from Gabor 85qcoupe
     
Eric Billing wrote:
     
> Greetings,
>
> I recently put new Potenza RE930 (with allignment) on our '93 100
CSQW. The 
> car rides real well and is considerably more comfortable to drive than
> before--the Pirellis were well worn and we were out of balance. 
>
> Bad news, is that while the new tires and allignment make things
> considerably quieter, I have discovered a "throbbing" vibration which
occurs 
> at about 65mph (which is 2800RPM in 4th on the auto-tranny).
>
> Some additional diagnostics:
>
> a) 2800rpm in 3rd (about 50mph) has similar noise but much less
noticable 
> and a different frequency.
> b) below 65 (say 60 mph) there is no noticable noise. Above 65, the
ambiant 
> road noise drowns out the throb...
> c) 65 mph in 3rd (about 4000 rpm) results in too much engine noise, so
throb 
> may not be present
> d) no shake in the steering wheel
>
> So, I'd be interested in hearing suggested courses of finding the
source of 
> the problem. Currently the car is back at the tire shop having the
wheels
> re-balanced and rotated. Hopefully the noise will go away or move in
someway 
> as to indicate a tire defect.
>
> Other ideas?
>
> Thanks,
>
> Eric
>
> --
>
> Eric Billing
> Eagan, MN
>
> '93 100 CSQW Pearl w/ 57K miles
> '91 Accord EX w/ 115K miles
>
> eric.billing@metaphasetech.com