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Old 02-05-2007, 09:16 PM   #1
Rootus
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Member#: 89821
Join Date: Jun 2005
Location: A Series Of Toobs
Vehicle:
2015 STI LE

Default Popping from left rear hub/axle/?

Today I noticed that whenever I start moving in either direction, either from a stop or from rolling in the opposite direction, I get a pop from the left rear hub area. I'm fairly new to the AWD stuff (and anything with CV joints ), so I'm not sure what I'm hearing. Here is a rundown of what I've determined:

1. Happens only once, then doesn't happen again until a change in wheel rotation direction.
2. Forward or reverse, same sound either way.
3. Setting the e-brake and loading up the driveline causes the pop, but it takes a fair amount of force before it happens (it's not slop).
4. Only happens on the left side, right side is quiet.
5. Turning the wheels by hand while feeling the axle, it appears there is zero slop until you get internal to the differential, where there is a small amount.
6. The noise can be reproduced by hand with the car in the air by turning the wheel back and forth fairly hard.

My first thought was CV joint. Honestly, though, I'm not at all familiar with the failure symptoms for a CV joint. The other thought I had was perhaps something to do with the e-brake. Couple of days ago when I was doing brake pads I noticed that the left wheel was locked nicely by the e-brake, the right one was not. Since then I have not reproduced that particular behavior.

Thoughts? Surely there have been a number of failed CV joints in the time the STI has been out, so I'm hoping someone can tell me whether or not it sounds right.

Tomorrow I think I'll take it to the dealer, hopefully they won't deny coverage. I'm stage 2, but I don't abuse the car (no launches, never drag raced), and it seems unlikely something I did would break a CV joint.

Dave
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Old 02-07-2007, 12:44 AM   #2
340Duster
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Join Date: Jan 2004
Chapter/Region: South East
Location: Following the green weenie
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2002 PSM WRX 16G-XT
'13 500 Abarth

Default

I'm by no means claiming to be an expert on the matter, but that sounds like when i destroyed the rear diff in my car. It would pop however when you turned tightly causing the spider gears to act on each other, and that was the part that was chewed up from being a bit too hard on it. My two cents.
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Old 02-07-2007, 04:55 PM   #3
Rootus
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Member#: 89821
Join Date: Jun 2005
Location: A Series Of Toobs
Vehicle:
2015 STI LE

Default

I do appreciate the input.

For future reference if anyone stumbles across this thread and has similar sounding issues, this turned out to be a loose axle nut. The dealer could not explain how it happened, and in fact asked me repeatedly if I had done anything to the car that involved removing the rear axle. For whatever reason the axle nut managed to unlock and start unscrewing. It had backed off about 1/3 of a turn.
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