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Old 12-29-2015, 11:14 PM
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Default strange sound in FJC

So my has a 2008 FJC that she bought new off the lot. Been fun driving it around this winter. It started making a strange roaring/droning noise a month or so ago. I don't drive it that often, so I thought it was her tires that were getting pretty bald. I finally had time to replace them this week since I am not traveling for work for once. (LOVE the new Goodyear Duratracs!) The sound did not go away, and since she is in L.A. visiting her mom, and my truck still has a shattered windshield, I have been driving it a lot. The noise starts at about 15-20 mph, and kinds sounds like droning mud tires or something, but is definitely not the tires. It gets louder the faster you go, but does not seem to be affected by accelerating, or decelerating, or braking. It also pulses every second or so, and the pulsing keeps pace with the speed. If I take my foot off the accelerator, or even put it in neutral and coast, the sound does not change. But...if I turn left, like around the corner on a side street, the sound stops completely. I checked all 4 tires today for wheel bearing looseness, and all 4 were solid. Any ideas? I was hoping to take it to Robbie today but got busy tearing the bumper off and working on my old farm truck. Any ideas would be greatly appreciated. Was hoping to get it running better before she flies home!

Thanks again all

Tim
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Old 12-29-2015, 11:34 PM
SteveH SteveH is offline
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Not sure how many miles are on your truck, but if it has the unit bearings in the rear axle like a 3rd gen 4Runner, I'd vote strongly for that. The way I finally found mine was to put it on a lift, let it idle with the trans in 2nd or 3rd gear (wheels spinning in the air) and then listen for the bad bearing. It was extremely obvious which bearing was bad when you were standing under the truck. I had mistakenly replaced a front wheel bearing earlier in this process, and those bearings are much more massive and less likely to fail (IMO). One of my rear wheel bearings failed at 120K miles or so, and the other at about 185K miles.
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Old 12-30-2015, 12:47 AM
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Bad CV axle(s)?

It seems like if it stops when you turn, that's probably what it is. As you rotate the tires the CV axles change angle on the outside boot. And all the bearings and other stuff in there will be wearing in a new place. I hope that makes sense.
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Last edited by TheHoneyBadger; 12-30-2015 at 07:23 AM.
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Old 12-30-2015, 06:48 AM
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Wheel bearings and CV axles were the two that came to my mind! Will be interested to hear what you find. Dependency on vehicle speed seems like the key symptom to me.

BTW, is it stick shift? Don't think it matter in this case, just curious.
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Old 12-30-2015, 09:16 AM
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145k, auto tran

Thanks! I will check out a few more things.
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* 00 LC
* stinky old Ford Diesel tow rig (FOR SALE)
* 99 Saab Convertible
* 97 4Runner (The original Green Chile)
* 71 FJ40 "The Raven" - sigh, selling to make room
* 64 FJ40 "Ocho Mater 40" AGAIN
* 74&70 FJ40 - parting out, eventually
* 1965 International Metro Van

has a 2008 FJC

KDěTIM
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Old 12-30-2015, 09:36 AM
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Quote:
Originally Posted by TheHoneyBadger View Post
Bad CV axle(s)?

It seems like if it stops when you turn, that's probably what it is. As you rotate the tires the CV axles change angle on the outside boot. And all the bearings and other stuff in there will be wearing in a new place. I hope that makes sense.
The fact that it goes away when I turn left definitely makes me think something to do with the CV axles. I will look into it more. Thanks so much guys!

__________________
* 00 LC
* stinky old Ford Diesel tow rig (FOR SALE)
* 99 Saab Convertible
* 97 4Runner (The original Green Chile)
* 71 FJ40 "The Raven" - sigh, selling to make room
* 64 FJ40 "Ocho Mater 40" AGAIN
* 74&70 FJ40 - parting out, eventually
* 1965 International Metro Van

has a 2008 FJC

KDěTIM
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Old 12-30-2015, 09:54 AM
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DaveInDenver DaveInDenver is offline
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Quote:
Originally Posted by timmbuck2 View Post
The fact that it goes away when I turn left definitely makes me think something to do with the CV axles. I will look into it more. Thanks so much guys!

Doesn't rule out wheel bearings, when you turn you increase or decrease the load on them.
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'09 Kawasaki KLR650
'12 Gunnar Rockhound 29

"Our task must be to free ourselves from this prison by widening our circle of compassion to embrace all living creatures and the whole of nature in its beauty. Nobody is able to achieve this completely, but the striving for such achievement is in itself a part of the liberation and a foundation for inner security. " --Albert Einstein
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Old 12-30-2015, 10:46 AM
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Quote:
Originally Posted by DaveInDenver View Post
Doesn't rule out wheel bearings, when you turn you increase or decrease the load on them.
Very true.
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Travis R.
TLCA #22468

The "Honey Badger"- 2003 Tacoma 4x4 4-Door -Lifted, Locked, Built.

I would rather walk than drive anything that's 2WD. ę

Spread the Gospel of the Wilderness.
Go to the Mountains and hear their good tidings.
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Old 12-30-2015, 11:16 AM
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Quote:
Originally Posted by DaveInDenver View Post
Doesn't rule out wheel bearings, when you turn you increase or decrease the load on them.
I checked the wheel bearings...all 4 wheels are solid, no movement at all at 12 and 6 o'clock.
__________________
* 00 LC
* stinky old Ford Diesel tow rig (FOR SALE)
* 99 Saab Convertible
* 97 4Runner (The original Green Chile)
* 71 FJ40 "The Raven" - sigh, selling to make room
* 64 FJ40 "Ocho Mater 40" AGAIN
* 74&70 FJ40 - parting out, eventually
* 1965 International Metro Van

has a 2008 FJC

KDěTIM
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  #10  
Old 12-30-2015, 11:24 AM
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DaveInDenver DaveInDenver is offline
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Quote:
Originally Posted by timmbuck2 View Post
I checked the wheel bearings...all 4 wheels are solid, no movement at all at 12 and 6 o'clock.
Is that check still valid with cartridge bearings? I honestly don't know one way or the other. I've read that noise and vibration are usually the way people tell their fronts on Tacos are bad. The roar to me would be bearings, CV axles usually also make an audible sound in a parking lot with tight turns, like a rock stuck in the tread sort of ticking.
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'08 Tacoma TRD - Donna
'09 Kawasaki KLR650
'12 Gunnar Rockhound 29

"Our task must be to free ourselves from this prison by widening our circle of compassion to embrace all living creatures and the whole of nature in its beauty. Nobody is able to achieve this completely, but the striving for such achievement is in itself a part of the liberation and a foundation for inner security. " --Albert Einstein
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