Dirty water in exhuast.

Discussion in 'General Chevy & GM Tech Questions' started by larryleeUSN, Jul 18, 2010.

  1. larryleeUSN

    larryleeUSN Rockstar 100 Posts

    Im sorry if theres already a post with this questioned. i searched it and couldnt find it. Im having an Issue. i just bought a truck. i dont know how often it was used before i go it. it was owned by an older guy who kept great care of his truck. its a 2000 GMC Sierra ext cab Z-71. its got the 5.3 in it. when i bought the truck i found an exhuast leak right where the pipes from the manifold come together at the Y pipe. theres a coupling there that has a leak. there was Black water comming from it. i wiped it and smelt it and it was just water. couldnt smell any kind of oil. the oil was just changed about 1.500 miles ago and was still in great condition. couldnt find a problem anywhere. any kinds of leaks. there was a lil oil by the drain plug where they drained it and a light film on the filter also. other than that nothing. doesn anyone have a clue of where this " BLACK WATER" could be from? i cheacked after i drove it an hour on the highway to take it home and nothing and a few days later and nothing again. Any help is greatly appreciated.
  2. murdog94

    murdog94 Epic Member 5+ Years 5000 Posts

    Moisture and carbon mixing in the Exhaust.. Completely normal.
  3. pmf608

    pmf608 Epic Member 5+ Years 1000 Posts

    x2. That is just water mixed with carbon. When you burn a carbon-based fuel such as gasoline, carbon and water vapor are produced, and all you are seeing there is that vapor being condensed. I find on my truck that a lot of that water vapor condenses into liquid when the engine is cold, but once it warms up it is mainly vapor, which is why you wouldn't notice it after driving it. All vehicles have some water production, but I think some more than others, such as these trucks. On mine, there is a small pinhole in the bottom rear of the muffler to drain all of the water that accumulates below the outlet of the muffler.
  4. larryleeUSN

    larryleeUSN Rockstar 100 Posts

    Thanks guys. i appreciate it. i wasnt to worried just wondering.

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