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  #11  
Old 04-01-2019, 11:46 AM
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Thanks guys for your input.
I just swapped from winter wheels to summer. I'll keep you updated how the sound changes.
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  #12  
Old 04-01-2019, 02:32 PM
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2003 4.6is, up on lift, should all 4 wheels spinning?

Also: a firm constant turn will usually change the tone of the bearing hum. Unfortunately left vs right turn is not a key to the change. (eg, left turn pushes more force on the outside tires) but it can flip the bearing race either way since you can't be sure if the outer or inner race is the up or down push unless by experiment you've determined.

In my case I know that 235 tires with my wheels will torque the top of the wheels out and my 255 tires/wheel combo torques the top of the wheel in (so the 235s push down on the outer race and up on the inner race, the 255s the opposite). I've gone from silent to full blown roar when going from 255 to 235
And recently went from annoying but can't tell which corner to 5-8 dB louder in the right rear corner (annoyingly a bearing I've replaced in the past).



I use the app FFT to measure the sound snapshot while holding the phone against the inner wheel well on each side of the car. I hold the phone against the plastic trim of the trunk cover to get a sound short.

It's amazing how much more obvious the measurements are compared to what you hear. So many of the frequencies just bounce off everything and sound like they are coming from every direction.

https://itunes.apple.com/us/app/fft/id298840058?mt=8

That's the iPhone version of the app. Priceless utility for finding strange sounds. Works with the inline mic on your earbuds also to help location finding.

One of the very first things I found was a leaky shop air hose. I heard a crazy high frequency whistle and of course it bounced off everything so I couldn't locate it. Using fft and sweeping around with the phone a 10 or 12kHz sound was obviously centered at a hose fitting. Added some thread tape and resolved in a couple minutes.
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  #13  
Old 05-09-2019, 06:34 PM
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Just for update.
After swapping winter to summer wheels, didn't make any changes to ruh-ruh-ruh sounds from fronts.
Took it to shop and verified the sounds are from front wheel bearings.
Since front ball joints are due as well, it is good time to tackle both together.

So I gave it to shop. ha....
There are few things just not worth my effort and time. Rather pay someone to take over possibly huge stress job.

Bought new front ball joints, bearing, lock ring, dust cover, hub nut and even Drive hub. Gave all to the mechanic.
Paid $540 CAD for labor, which is about $400 USD. Totally worth it.
The car drives butter smooth now.
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