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Old 02-20-2012, 07:43 PM   #1
cole_naymash
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Default Muffler Flange Gasket Problem (new problem 2-25-12)

So, I have narrowed down my increasing exhaust noise to the muffler flange gaskets leaking air between the mid pipe and mufflers on my 2.5i SOHC 2009 Legacy. I don't know why they would be going bad already, maybe all the salt on the roads in MN...anyways...being that it's cold out, does anyone know if there is negative impact from leaving the car with little to no muffler flange gaskets for a bit?

My concern is blow by from the flange leaks would cause excess oxygen during combustion and induce a lean condition,..?? Or am I just retarded?

I have the tools and capabilities to fix this no problem but not a heated garage. anywho, some suggestions would be appreciated,

Thanks!
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Last edited by cole_naymash; 02-25-2012 at 11:26 PM.
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Old 02-20-2012, 07:55 PM   #2
chazly413
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too many friction losses

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The muffler to midpipe interface is so far downstream that is has no affect on any of the headers' functions. You're fine.
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Old 02-20-2012, 08:06 PM   #3
cole_naymash
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ok, cool...I have noticed this increasing noise from the back of the car for a month or so now and after I did my last oil change (I refill the empty oil containers as a means of transporting the used fluid to the gas station for disposal) that I was about 800ml short. So I got super paranoid that I was running to lean and burning oil...

Now that I think about it, with a totally stock car, (no exhaust, intake, stupid mods) that the problem probably comes from how I drive it in addition to a small error last time I changed the oil? I hope...???

No mods,
I do my oil changes 3-4k with conventional oil
also filter changes with the oil
I just put new plugs in at 35k miles
I had the dealer do the whole 30k service as well
no check engine lights, no weird noises, ...
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Old 02-20-2012, 11:40 PM   #4
chazly413
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Wait, so what's the problem you're mentioning? And it was 800mL low just by judging how much the bottles filled up? That's not particularly a good judge, a lot of that oil will still be clinging to surfaces in the engine. Just make sure you watch your dipstick.

Also, Subarus burning oil is very commonplace. Make sure you stay on top of it.
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Old 02-25-2012, 07:23 PM   #5
cole_naymash
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Ok so just checked my oil 2000 miles into my latest oil change and I had to add a whole liter of oil to be at full on the dip stick. This may be a different problem then I posted for when I created the thread. I don't have any modifications done to the 2.5i sohc motor. 5 speed man trans, 43,xxx miles, and no check engine ....no wired driving problems...? Anyone have some ideas about the burned oil?
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Old 02-25-2012, 08:10 PM   #6
alt14
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Its still under warranty, take it to subaru and see what they have to say
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Old 02-25-2012, 10:14 PM   #7
cole_naymash
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No, the warranty has expired. I am very capable of doing my own work but narrowing down the problem with out subaru specific expertise will be difficult. Any thoughts would be greatly apprciated, thanks much, Cole
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Old 02-25-2012, 10:32 PM   #8
alt14
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43k miles and 09 would still be covered for powertrain or am I missing something sorry
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Old 02-25-2012, 11:24 PM   #9
cole_naymash
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I'm pretty sure my warranty expired at 36,000 miles but I will check my paper work when I get home tonight.
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Old 02-25-2012, 11:26 PM   #10
alt14
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Powertrain is 60k if theirs a problem im sure it would fall under this
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Old 02-25-2012, 11:28 PM   #11
cole_naymash
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That would be super awesome! I'll definitely follow up with this tonight! Thanks!!!!
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Old 02-25-2012, 11:31 PM   #12
alt14
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Not a problem, loosing a liter after only 2000 miles doesn't seem normal to me especially with a car that only has 43k miles
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Old 02-25-2012, 11:51 PM   #13
cole_naymash
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Yea not to me either and twice in a row (happened with the last oil change period too) means that there is likely to be a problem for sure.
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Old 02-26-2012, 09:31 AM   #14
GrundleJuice
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Subaru states that up to one qt of oil consumption per 1000 miles is "normal" in the owners manual. So a liter over 2000 is not going to be deemed a problem by subaru.

With that said, a good dealer/mechanic should recognize that the oil consumption has changed suddenly and that it might represent a symptom of a real problem.
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