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Old 03-11-2013, 04:04 PM   #1
chip4761
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Member#: 55867
Join Date: Feb 2004
Location: Ashtabula, OH
Vehicle:
2005 Saabaru
AS

Default AWD broken

Saab 9-2x. Manual Transmission.

Symptoms: When accelerating from a stop, there will be a heavy clunk from the rear end and slight jump in the RPM. I think the AWD is somehow disengaging.

Question: How do I test this on jackstands/lift/etc.? I think it requires the rear wheels to have some manner of resistance to disengage, so how do make that happen without getting killed? I need to see if it's the center or rear diff, or maybe just an axle/hub. Any ideas?
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Old 03-12-2013, 01:18 PM   #2
Gamble_WRX
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PSM

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when you do any sort of launching on a 5 speed, even rough clutch engagement, will cause a clunk in the rear diff. you dont need resistance on it nor does it have to be running to test the theory of the AWD breaking. put it on a lift, or jackstands, with the car in gear. turn one of the tires, and look under the car, you should see the Driveshaft rotating. if it doesnt, try the other side. subarus arent acctually AWD... they are, but they arent. the diffs are not LSDs from the factory (unless you own an STi) so only one front, and one rear tire constantly drive. when your cornering, the center diff distributes power to the tires that need it. same thing when you slip in the snow. one tire slips, the other engages. We tested all of this in a parking lot in the snow when i had my old WRX right before the swap.
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Old 03-12-2013, 06:52 PM   #3
chip4761
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AS

Default

Err, I think you misunderstand my question. I'm POSITIVE the AWD is broken, but how do I test it when it only disengages under load?
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Old 03-12-2013, 07:46 PM   #4
garudatwo
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Default

Does your parking brake stop the front wheels or the rear wheels?
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Old 03-13-2013, 09:34 AM   #5
chip4761
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AS

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Unfortunately, my parking brake doesn't do much of anything at the moment. This is what happens when you buy a used car, I guess.
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Old 03-13-2013, 10:39 AM   #6
Counterfit
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Get someone you don't care for to hold one axle?
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Old 03-14-2013, 08:26 AM   #7
mphwang
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Default

Sounds like a clutch and a bad mount somewhere.

Last edited by mphwang; 03-14-2013 at 08:27 AM. Reason: adding stuff.
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Old 03-14-2013, 10:11 AM   #8
chip4761
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AS

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I've tested in on ice after it "disengages." Neither of the rear wheels are getting anything. I'm thinking it has to be the middle or rear diff. I'm picking a rear up from a guy on here, and I guess reselling it or mine if that's not the problem.

I don't mean to sound like a butt-hat, but how would a bad clutch make the rear wheels not drive? My clutch is bad also (I have long weekend ahead of me.)
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Old 03-14-2013, 10:14 AM   #9
poly_poly-man
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WRB

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Lift all four wheels off the ground safely, start car, put in first, clutch out.

If all four spin, things are "normal", at least in some regard. You'll probably notice that one of your rears isn't spinning - check the retaining clip on the inner end of the rear axle shaft (or, I'm pretty sure what this is saying is, shove the axle in harder until it works :P)
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Old 03-14-2013, 10:24 AM   #10
chip4761
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AS

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Interesting. I'll give that a try.
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