Vibration issue when decelerating - Subaru Outback - Subaru Outback Forums
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post #1 of 23 (permalink) Old 09-17-2017, 03:31 AM Thread Starter
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Vibration issue when decelerating

Hi, I just bought my parents old Subaru Outback 2000 4cyl manual. Having never driven manual before I was very hard on the clutch and stalled multiple times. Dad drove the car back home and we noticed a vibrating noise coming from the front of the car when decelerating(sounded like it was coming from near the gearstick). The noise seems to stop when the clutch is pressed in. Any ideas what might be causing this?

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post #2 of 23 (permalink) Old 09-17-2017, 04:34 AM
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Originally Posted by Lachlan Cumming View Post
Hi, I just bought my parents old Subaru Outback 2000 4cyl manual. Having never driven manual before I was very hard on the clutch and stalled multiple times. Dad drove the car back home and we noticed a vibrating noise coming from the front of the car when decelerating(sounded like it was coming from near the gearstick). The noise seems to stop when the clutch is pressed in. Any ideas what might be causing this?
There's a clear causal connection between the transmission being engaged with the engine and the vibrating noise: what you should identify is if it is only tied to engine RPM (check this by revving engine high enough and sustaining it for a few seconds) or if it requires the transmission being engaged.

If it does not require being in gear, it's likely one or more motor mounts: a good check there is to rev the engine while in neutral with emergency rake on with hood up and see if the engine rotates when you do it.

Now, if it requires being in gear, see if there's an RPM connection, as that may be useful.

I've not heard of this, but if you've been rough on the clutch, for all I know, you've taken a divet out of the clutch (if the clutch is as old as the car, it may be brittle) or you may have chipped some teeth off of gears, or damaged something else. Torquing things hard by dropping into gear and stalling with sufficient power can cause all sorts of things to break, including stuff in transaxles: you may have something very expensive to fix. Until you isolate if it's the engine or the transmission or some combination, it's hard to guess more accurately.

Note: I'm not an auto mechanic for a living, but I've had some interesting experiences personally and otherwise to base things off of.

Anyone else able to add to this, or rule out one or more of these things?


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post #3 of 23 (permalink) Old 09-18-2017, 01:05 PM
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Is noise on decel linked to bad center diff bearings?
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post #4 of 23 (permalink) Old 11-01-2017, 04:38 PM
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I had a banging/clunking sound that sounded like it was coming from either the steering column or gear selector when braking from highway speeds in my 2002 OBW that also progressively caused the steering wheel to shake the longer I let it go. Ended up being a sticking brake caliper that was causing my rotors to warp. (I had the rotors/pads replaced a year earlier so I wasn't sure that was it, but it was due to the faulty caliper.

A&A the Shop here in Anchorage, AK (awesome independant Subaru shop) changed the front calipers and all rotors and pads and now it's smooth sailing. I went with them due to their 3 year/36k mile warranty on all parts and labor because I spent $700 last year and $1000 last week and I want this to be the end of it.

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post #5 of 23 (permalink) Old 11-01-2017, 05:52 PM
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Agree 1st thing to check engine / transmission mounts , brakes , transmission bearing, inboard (inner CV) joints, clutch release / throw out bearing perhaps?


PS
If the vibration had just developed after you started driving it,
perhaps a clutch component or transmission bearing has been damaged?

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Last edited by subnz; 11-01-2017 at 06:06 PM. Reason: omission , ps
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post #6 of 23 (permalink) Old 04-18-2019, 05:45 AM
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My 2005 subaru outback shakes on deceleration when im just rolling at speeds of 80kms and above, i have had new tires put on the back, balanced and wheel alignment, a new tailshaft put in. I donít know what it could be. I have replaced my front cvs on both sides. Please help?
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post #7 of 23 (permalink) Old 04-18-2019, 06:20 AM
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My 2005 subaru outback shakes and vibrates when decelerating 80kms and above, not when i brake it’s when i only roll.i have replaced my front cvs, my tailshaft, two new back tires and balanced and wheel alignment done. I don’t know what it could be and three mechanics have looked at it. I am replacing my o2 sensor. Please help?
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post #8 of 23 (permalink) Old 04-18-2019, 08:14 AM
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where do you feel vibration? in the steering wheel? seat-of-the-pants?

when the problem is happening, does it change if you touch the brakes?

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post #9 of 23 (permalink) Old 04-19-2019, 12:55 AM
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My drivers seat vibrates and the steering wheel does too. And i feel the shake isnít as bad when i brake.
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post #10 of 23 (permalink) Old 04-19-2019, 07:17 AM
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Quote:
Originally Posted by Pet View Post
My 2005 subaru outback shakes on deceleration when im just rolling at speeds of 80kms and above, i have had new tires put on the back, balanced and wheel alignment, a new tailshaft put in. I donít know what it could be. I have replaced my front cvs on both sides. Please help?
all tires on a subaru have to be the same.

same diameter, or you get toque bind. and new tires mixed with half used tires are enough of a diameter difference to do that.

and it is preferred to have the same tread / type. if you got sets of 2 and 2,...sell them used to the front wheel drive people.

____

alternatively: front "A" arms get worn with time / miles (so like 200,000 kms, = 125,000 miles)
on the gas you may stretch them out so the car is going along OK, off the gas they can return to where they are worn and the car is out of alignment producing the shaking.

2005-2009 US / Canada spec years are also very hard to keep in alignment. (lots of threads with fixes in the 2005-2009 section)

and moving thread as we are now mixing generations,


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