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10-08-2020, 08:24 AM | #1 |
Scooby Specialist
Member#: 100449
Join Date: Nov 2005
Chapter/Region:
SCIC
Location: NoHo
Vehicle:'04 WRX 307whp278tq 03WRX wgn, '72 MGB |
2003 WRX Wgn, violent driveline shudder
I all, I'm looking for help diagnosing this issue I'm having with my 03 WRX 5MT. The problem first presented itself as a slight vibration when pulling away from a stop. Believing it to be a bad transmission mount of something non serious like that I ignored it at first and continued to drive the car fro some time. Eventually it progressed into a knocking sound, at this point I thought it might be a broken CV joint. I looked under the car and a torn CV boot on the driver's side front axle seemed to confirm this, so I ordered a new axle from the auto parts store. Before I could pick up the axle the knocking quickly progressed into a loud banging that violently shakes the whole car. I replaced the axle with the torn CV boot last night but that did not do anything for the problem.
The banging occurs at low speeds after pulling away from a stop, but goes away suddenly above 25mph. It's done it in both 1st and 2nd gear. I'm wondering if there is a problem with in the transmission or in one of the differentials.
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10-08-2020, 09:33 AM | #2 |
Scooby Specialist
Member#: 298403
Join Date: Oct 2011
Chapter/Region:
W. Canada
Vehicle:2008 WRX Premium Spark Silver |
Did you replace the trans mount?
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10-08-2020, 10:18 AM | #3 |
Scooby Guru
Member#: 21145
Join Date: Jul 2002
Chapter/Region:
NESIC
Location: Not in my own time
Vehicle:2002 Enemy of Aku |
Aside form the transmission mount, have the motor mounts been checked / replaced?
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10-08-2020, 11:23 AM | #4 |
Scooby Newbie
Member#: 467167
Join Date: May 2017
Chapter/Region:
NWIC
Location: Redding, California
Vehicle:2002 Impreza WRX |
Scooby,
I had gremlins in my drivetrain sounding like a differential carrier bearing gone-bad. I pulled the transmission and split it open to check carrier bearings. All looked good. I had a blow-out on driver's side front. My spare 'was' a small diameter spare, and when limping into the nearest town, the drivetrain would wrap-up and release with a bang. I don't know if the small diameter spare was causing the wrap-up, or the ABS system reading one tire spinning faster than the other three and applying braking to compensate. The end result was my Viscious Coupler had burned up and was making a terrible growling noise at any speed while drivetrain was turning. yep So i ordered a new Viscious Coupler from Subaru, installed it, and my noise went away. hip hip hooray Even tho i like spinning hookers in the snow, i think running the small spare for 15-miles was the cause of the slippage and differentiation of the Coupler which burned it up. Every time it would wrap-up and release it made the bang. who knows. Len |
10-09-2020, 02:07 AM | #5 | ||
Scooby Specialist
Member#: 100449
Join Date: Nov 2005
Chapter/Region:
SCIC
Location: NoHo
Vehicle:'04 WRX 307whp278tq 03WRX wgn, '72 MGB |
I inspected the trans mount and it did not appear to need replacing
Quote:
Quote:
I have a manual so I don't have a viscous coupler |
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10-17-2020, 07:19 PM | #6 |
Scooby Specialist
Member#: 100449
Join Date: Nov 2005
Chapter/Region:
SCIC
Location: NoHo
Vehicle:'04 WRX 307whp278tq 03WRX wgn, '72 MGB |
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10-17-2020, 07:21 PM | #7 |
Scooby Specialist
Member#: 100449
Join Date: Nov 2005
Chapter/Region:
SCIC
Location: NoHo
Vehicle:'04 WRX 307whp278tq 03WRX wgn, '72 MGB |
So I took a little video just pulling away down my street so so people can see and hear what my car is doing, here it is:
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10-18-2020, 11:42 AM | #8 |
Scooby Specialist
Member#: 29292
Join Date: Nov 2002
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SCIC
Location: Orange County CA
Vehicle:2004 WRX wagon silver |
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10-19-2020, 10:08 AM | #9 | |
Scooby Guru
Member#: 21145
Join Date: Jul 2002
Chapter/Region:
NESIC
Location: Not in my own time
Vehicle:2002 Enemy of Aku |
Quote:
How old are they? That is a lot of shudder and motor mounts and/or transmission mount would be highly suspect based on what the video shows. Not sure if I asked already or not: - Driveshaft. Original? Have you checked to see if the bearings are gone or if the center bushing is bad? |
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10-19-2020, 08:46 PM | #10 | ||
Scooby Specialist
Member#: 100449
Join Date: Nov 2005
Chapter/Region:
SCIC
Location: NoHo
Vehicle:'04 WRX 307whp278tq 03WRX wgn, '72 MGB |
Quote:
Quote:
As an argument against it being a bushing or mount, it only does it in 1st and 2nd (or at least at low speed some I'd only be in those gears), and it does not appear to be affected by bumps or potholes. I'll crawl under the car at my first opportunity but that may not be until the weekend. |
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10-20-2020, 10:19 AM | #11 | |
Scooby Guru
Member#: 21145
Join Date: Jul 2002
Chapter/Region:
NESIC
Location: Not in my own time
Vehicle:2002 Enemy of Aku |
Quote:
Presuming you are using the OEM 2-piece driveshaft. There is a center bearing there that the driveshaft rides in. - It does wear out. - It will not make the noise all the time - If that is what it is, then you will need to replace the driveshaft. Another possibility is one or both driveshaft u-joints. If they are bad, you'll need to replace the driveshaft. While you are under the car, check to see if anything is rubbing, like the exhaust pipes or something. You should have a 1/2" clearance from everything to account for movement between the item and the car body / frame. |
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10-21-2020, 12:10 PM | #12 |
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Tri-State
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Vehicle:06 GG WRX / 09 FXT @florencedestinedfxt |
That is interesting for sure. Sounds like something is having trouble getting up to speed if that makes any sense.
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10-22-2020, 12:56 PM | #13 |
Scooby Specialist
Member#: 100449
Join Date: Nov 2005
Chapter/Region:
SCIC
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Vehicle:'04 WRX 307whp278tq 03WRX wgn, '72 MGB |
I'm wondering if it is something internal in the transmission. I was moving cars around to put this one in the garage and when I was pulling back into the driveway with the steering wheel at full lock I felt something like diff binding I get with my 6MT when I have the dccd set to lock.
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10-28-2020, 10:55 PM | #14 |
Scooby Specialist
Member#: 100449
Join Date: Nov 2005
Chapter/Region:
SCIC
Location: NoHo
Vehicle:'04 WRX 307whp278tq 03WRX wgn, '72 MGB |
So it wasn't the driveshaft. I did find a missing exhaust hanger so i replaced that but it made no difference, that was kinda wishful thinking that that would solve it anyway.
I took the car to a transmission shop today, the problem has gotten worse, driving there I wasn't even sure I was going to make it before the car knocked and shook itself apart. Anyway, they think all signs point to center diff. They are going to take it apart and see. |
10-29-2020, 09:29 PM | #15 |
Big Ron
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You can't repair a center diff, its a swap out thing as there's like 3 people on earth who could repair it and 0 of them live in southern California. Good news is you can swap it without removing the trans so there's not a huge remove and replace trans labor cost.
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10-29-2020, 10:40 PM | #16 | |
Scooby Specialist
Member#: 100449
Join Date: Nov 2005
Chapter/Region:
SCIC
Location: NoHo
Vehicle:'04 WRX 307whp278tq 03WRX wgn, '72 MGB |
Quote:
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11-11-2020, 07:10 PM | #17 |
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Vehicle:02 vf30 pnp wagon silver and cf |
Check the driveshaft and the rear diff bushings (clunk kit). Sounds like something is binding up.
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11-12-2020, 10:29 AM | #18 |
Scooby Guru
Member#: 21145
Join Date: Jul 2002
Chapter/Region:
NESIC
Location: Not in my own time
Vehicle:2002 Enemy of Aku |
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11-12-2020, 03:15 PM | #19 |
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11-13-2020, 12:57 PM | #20 |
Scooby Specialist
Member#: 100449
Join Date: Nov 2005
Chapter/Region:
SCIC
Location: NoHo
Vehicle:'04 WRX 307whp278tq 03WRX wgn, '72 MGB |
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11-13-2020, 12:59 PM | #21 |
Scooby Specialist
Member#: 100449
Join Date: Nov 2005
Chapter/Region:
SCIC
Location: NoHo
Vehicle:'04 WRX 307whp278tq 03WRX wgn, '72 MGB |
So it turns out it was the u-joints on the drive shaft as well as some bearing in the trans. Also got some gaskets replaced in between the trans case sections. Trans is good, and the car is back and on jack stands in my garage while I set up my coilovers and change a wheel bearing.
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