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Old 02-21-2011, 01:14 PM   #1
n2oiroc
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Default Loud exhaust after deep snow?

Driving home yesterday in my 09 2.5i (18k miles) the snow that was wet and heavy and deep in spots. After driving for a bit the exhaust got really loud, like a crack in the manifold or pipe. As i got out of the snow it got quieter and this morning it was fine. Anyone else run into this?
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Old 02-21-2011, 05:31 PM   #2
tabruder
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I get some sort of resonance with snow packing up around a heat shield the midpipe/2nd cat area. It makes a tinny (not "tiny"), buzzy sound, rather loudly from right under the front seat area. Always with mild temperatures and the heavy snow that comes with it (-5 C and up). Never had the issue in colder weather when the snow is lighter and drier. I've treated it as a non-issue. The first time I heard it, though, I thought I ripped something off. Once I parked in the garage and the snow melted and fell away, the noise was always gone.

Biggest thing to watch for with the snow building up is if it gets high into the engine compartment and starts interfering with air flow and cooling.
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Old 02-21-2011, 05:36 PM   #3
EdHilario
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It's just cold. Exhausts sound like **** in the winter until they're warm after 5-10 minutes of driving.
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Old 02-21-2011, 08:57 PM   #4
n2oiroc
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update: drive home from work was rough! clunking over bumps and during shifts and a really bad vibration over 40 mph. got home and jacked it up. a ton of ice was packed above the cats at the tailshaft and packed all around the driveshaft. i knocked as much out with a broom handle as i could and threw the torpedo heater under the car for a while. im pretty sure that was it.
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Old 02-21-2011, 09:29 PM   #5
RaceFaceXC
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Make sure to get the snow/ice out of the wheels too.
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Old 02-22-2011, 08:37 AM   #6
GEE-OTTO
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The vibration is due to ice in the wheels the loud exhaust happened to me as well TWICE sounds like a EJ255 which isn't too bad. I have 08 Legacy 2.5i and my cause was ice/snow packed up around the muffler tips one got clogged
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Old 02-23-2011, 04:02 AM   #7
EdHilario
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When the exhaust is cold, everything is pretty tight and more prone to rattling whereas when they're warm and free to move around due to heat loosening up parts and bushings, you won't hear or feel it as much.
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Old 02-28-2011, 01:56 PM   #8
BDZ
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My wife's '08 2.5i did the same thing last week after she drove in 8" of snow. Knocked all the snow out from underneath and ran it thru the underspray car wash. All back to normal. Its funny our '06 2.5i never did this in 125k miles.
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Old 03-02-2011, 03:03 AM   #9
LonelyHiker
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I've had to take mine to the car wash a couple times this winter to blow the ice off, similar problems as you're describing. Blowing the ice off the wheels and underbody should solve it.
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Old 03-02-2011, 11:12 AM   #10
Samirr76
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perhaps snow is also building up inside the rear bumper covers.....happens if you spin your tires alot in a forward gear from show flying backwards. This might cause the exhaus note to resonate more.
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Old 03-02-2011, 12:45 PM   #11
danparm302
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same issue on my 2010 over a year ago on two occasions. like everyone was saying removing the snow did the trick. never had any issues this winter season, however, snow wasnt as deep and much drier.
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Old 03-03-2011, 08:34 AM   #12
ksnh
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Quote:
Originally Posted by n2oiroc View Post
...i knocked as much out with a broom handle as i could and threw the torpedo heater under the car for a while.
Torpedo heaters are useless under a car unless you have a minor fuel leak to help out.
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