Water dripping from rear bottom of muffler - TerrainForum.net: GMC Terrain Forum
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post #1 of 35 (permalink) Old 03-20-2011, 08:55 PM Thread Starter
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Water dripping from rear bottom of muffler

When I pull into my drive I see water drips on the left side all up the driveway (like in the summer time when the A/C has been running and you get a regular dripping) In the garage a small pool of water forms with black soot in it also. Looked under the Terrain today and saw that the water dripping from the rear lower of the muffler (2011 FWD I4). Also black soot around the area from which the water was dripping.

I do not see a manufactured drain hole in the muffler, it just seems to be coming out from the joint between the end piece of the muffler and the oval shaped shell tube.

The tailpipe itself seems to be dry, but posssibly with a little higher amount of black soot than what I would expect.

I know it is water as I touched, smelled, and tasted it, and it also evaporates in a few minutes off of the driveway.

I know that water condensation is a normal by-product of combustion, but I have been driving for 57 years and have never seen a drip like this. ( Have noticed it since new [2100 miles ago], but just now looked under the Terrain. )



So my question is what do you think is going on. Would some one please look under their Terrain (or maybe Equinox) with the I4 engine and see if they are seeing the same thing. (Water and no drain hole, etc)

FWIW, I am talking a central Michigan environment, where we have been having cold weather, but as of late it has been somewhat milder, but still get the dripping.

Searched the forum and found no question like this. Checked Google and all responses say "normal", but I say after 57 years of driving, this is different.
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post #2 of 35 (permalink) Old 03-20-2011, 09:41 PM
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Re: Water drippong from rear bottom of muffler

Normal - most mufflers have a drain hole to let the moisture out that collects within the mufler. Otherwise, you will have a can full of water and it will promote rust.


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post #3 of 35 (permalink) Old 03-20-2011, 09:44 PM
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Re: Water drippong from rear bottom of muffler

Could it be a bad weld at the seam that's letting water out seep out?

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post #4 of 35 (permalink) Old 03-20-2011, 10:02 PM
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Re: Water drippong from rear bottom of muffler

If you look closely, the seam is open right there. Just allows the water to drip out.

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post #5 of 35 (permalink) Old 03-20-2011, 10:17 PM Thread Starter
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Re: Water dripping from rear bottom of muffler

Quote:
Originally Posted by RIT333
Normal - most mufflers have a drain hole to let the moisture out that collects within the mufler. Otherwise, you will have a can full of water and it will promote rust.

But like I said, I have never seen a car drip like this before in 57 years of driving, and do they usually have black soot around this drain hole? If it were normal, it seems like I would have noticed it on other vehicles. I have lived on a cement driveway for over 25 years and have never observed it before!

This is a drip drip drip all the way up the driveway after I have been driving the car to normal temperatures.

And I will ask further have you, or anyone else, observed the dripping? Constant dripping on your vehicle and have you looked under yours to see if the back end of your muffler is sooted for about a 4 inch radius around the drip point?
If so, I have not ever noticed that either.
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post #6 of 35 (permalink) Old 03-20-2011, 10:18 PM Thread Starter
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Re: Water dripping from rear bottom of muffler

Quote:
Originally Posted by GARYD
Could it be a bad weld at the seam that's letting water out seep out?
That is what I was wondering.
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post #7 of 35 (permalink) Old 03-20-2011, 11:33 PM
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Re: Water dripping from rear bottom of muffler

In your 57 years you've never had a car with Direct Fuel Injection and 2 CATs.. The new cars exhaust gets much hotter that any other combustion car that previously existed as the emissions controls are very strict. The amount of condensation is increased because the muffler baffle (at least in the V6) is really big, so there is more volume which is more condensation.
The black sooth is a not a sign that your car is not working as it should. (remember this is a different world with the gazillion electronics in modern cars).

In my Terrain I noticed that after the engine is shut down there is "steam" coming out of the tailpipes for good 20 seconds.. like a smoking gun.. I've never seen that in any car, looks nice but gets my attention every time.



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post #8 of 35 (permalink) Old 03-21-2011, 07:12 AM
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Re: Water drippong from rear bottom of muffler

Quote:
Originally Posted by RIT333
Normal -
X2

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post #9 of 35 (permalink) Old 03-21-2011, 08:35 AM
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Re: Water dripping from rear bottom of muffler

Quote:
Originally Posted by Terrain2011
But like I said, I have never seen a car drip like this before in 57 years of driving, and do they usually have black soot around this drain hole? If it were normal, it seems like I would have noticed it on other vehicles. I have lived on a cement driveway for over 25 years and have never observed it before!

This is a drip drip drip all the way up the driveway after I have been driving the car to normal temperatures.

And I will ask further have you, or anyone else, observed the dripping? Constant dripping on your vehicle and have you looked under yours to see if the back end of your muffler is sooted for about a 4 inch radius around the drip point?
If so, I have not ever noticed that either.
The volume of water is more than I have ever seen. The muffler has a weep home so water drains. Better to be getting out of the exhust than sitting in there
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post #10 of 35 (permalink) Old 03-21-2011, 09:49 AM Thread Starter
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Re: Water dripping from rear bottom of muffler

Quote:
Originally Posted by oracle
In your 57 years you've never had a car with Direct Fuel Injection and 2 CATs.. The new cars exhaust gets much hotter that any other combustion car that previously existed as the emissions controls are very strict. The amount of condensation is increased because the muffler baffle (at least in the V6) is really big, so there is more volume which is more condensation.
The black sooth is a not a sign that your car is not working as it should. (remember this is a different world with the gazillion electronics in modern cars).

In my Terrain I noticed that after the engine is shut down there is "steam" coming out of the tailpipes for good 20 seconds.. like a smoking gun.. I've never seen that in any car, looks nice but gets my attention every time.


interesting, and informative, but are you experiencing the dripping like I described? I am not seeing any steam, even on a near zero temp. day, but still see the dripping!
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