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Old 05-27-2013, 08:42 PM   #1
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Hole on back of muffler

I'v been saying to myself all along that what I'm seeing coming out of the exhaust is condensation heat and cold air but can anyone tell me what the hole is for? Looks like a drain hole. And it's spotting the garage floor pretty regulary.
I'm sure it's normal but can anyone tell me where all the oily shean is coming from? .....
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Old 05-27-2013, 08:46 PM   #2
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Hole is Normal, oil sheen not. Are you sure it's oil and not carbon?


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Old 05-27-2013, 08:59 PM   #3
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Originally Posted by kalamajama View Post
I'v been saying to myself all along that what I'm seeing coming out of the exhaust is condensation heat and cold air but can anyone tell me what the hole is for? Looks like a drain hole. And it's spotting the garage floor pretty regulary.
I'm sure it's normal but can anyone tell me where all the oily shean is coming from? .....
..you answered your own question, it's a drain hole for moisture. The dark material in the water that excreted after warm-up is carbon. All normal.
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Old 05-27-2013, 09:01 PM   #4
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Hole is Normal, oil sheen not. Are you sure it's oil and not carbon?


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Probably carbon since it wipes off fairly easy. I've got 3000 miles on it and it's been doing it since day one. But that's a lot of crap coming out of the exhaust, but then this is my first ride with a supercharger on it so that maybe the difference. Thanks
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Old 05-27-2013, 09:03 PM   #5
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..you answered your own question, it's a drain hole for moisture. The dark material in the water that excreted after warm-up is carbon. All normal.
Thanks Scott, now I feel a little more at ease.
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Old 05-27-2013, 09:03 PM   #6
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Do you have a catch can?
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Old 05-27-2013, 09:05 PM   #7
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...if you don't stand on it occcassionaly, and only run it a low speed carbon accumulates in the exhaust system. Blowing out the buildup once in awhile will eliminate this stain on your floor.
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Old 05-27-2013, 09:10 PM   #8
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Do you have a catch can?
No but it's my next mod. trying to get all the bolt on mods that I can get that will actually benefit the car. Will it eliminate the carbon build up?
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Old 05-27-2013, 09:12 PM   #9
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Thanks all for quick imput......
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Old 05-27-2013, 09:13 PM   #10
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...no, the catch can will eliminate the oil ingestation into the super charger and intake manifold. The oil buildup will degrade your engine performance over time, but not lead to a stain in the water condensation dropping to the floor during normal warm up.
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Old 05-27-2013, 09:29 PM   #11
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did you remove your catalytic converters? Also does the car have a tune in it perhaps?
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Old 05-27-2013, 09:40 PM   #12
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..it's carbon buildup in the factory exhaust system....it's need to not idle so much, not be be thought of like a passenger vehicle, or babied. It will build up and accumulate carbon over time unless one stands on it and blows it out of the system. That, or it's throwing a CEL for running rich.
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Old 05-28-2013, 02:02 AM   #13
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Hole is Normal, oil sheen not. Are you sure it's oil and not carbon?


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Isnt everything basically carbon?
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Old 05-28-2013, 07:18 AM   #14
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This is a drain hole for water
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Old 05-28-2013, 08:13 AM   #15
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Isnt everything basically carbon?
I guess my point was if its actual oil it's a problem.


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Old 05-28-2013, 01:17 PM   #16
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Carbon, a by product of exhaust. Perfectly normal. You exhaust tips will turn black also, this is the same thing except mixed with condensation.
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Old 05-28-2013, 06:05 PM   #17
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Originally Posted by OldScoolCamaro View Post
...if you don't stand on it occcassionaly, and only run it a low speed carbon accumulates in the exhaust system. Blowing out the buildup once in awhile will eliminate this stain on your floor.
24k miles driven in every kind of weather and no wet spot here. i have to agree with the last sentence above cuz ive got a heavy foot, it burns off the condensation
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Old 05-28-2013, 09:29 PM   #18
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Ok thanks for all the imput. I'm thinking I've got a heavy foot too according to the 12.1 MPG all around driving in 3000 miles shown on my display.. I will try to get it down below 10 ....MPG that is. But now I've gots to go up river and fish....
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Old 05-28-2013, 09:34 PM   #19
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Isnt everything basically carbon?
...all life forms are comprised of carbon...., one of the most common elements in the Universe.
A-Yes....
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Old 05-29-2013, 08:16 AM   #20
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Ok thanks for all the imput. I'm thinking I've got a heavy foot too according to the 12.1 MPG all around driving in 3000 miles shown on my display.. I will try to get it down below 10 ....MPG that is. But now I've gots to go up river and fish....
lol, poles and nets sticking out of a zl-1 . will your canoe go up top or will you be pulling a little trailer too?
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Old 05-29-2013, 03:01 PM   #21
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No I've got a river raft that I put on top of my car.......I had a buddy in California back in the seventies that actually did put a raft on top of his 1967 Camaro SS when we went rafting. And another in a 1967 Pontiac GTO. All kidding aside that was just for show to add a little humor to this thread.......
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Old 05-30-2013, 02:32 PM   #22
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Carbon, a by product of exhaust. Perfectly normal. You exhaust tips will turn black also, this is the same thing except mixed with condensation.
Yep, Perfectly normal. The weep holes are there to drain the moisture out to prevent your mufflers rusting out prematurely.

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