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    Thread: black smoke/soot on tail pipe

    1. Banned zeroman's Avatar
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      02-07-2008 03:09 PM #1
      so ive searched and not too many on ball answers to my question. I just started up my car, last night there was a huge snow storm... There was a bit of snow in my tail pipe, so i decied to start my car up and see what it sounded like...

      Perfectly fine, but i noticed that the fumes that were coming out of the tail pipe were black under high RPMs and black soot would come out. Now I am assuming this would be carbon build up and its normal but the black smoke part of it what is it? I changed oil about 1000KMs ago with Castrol GTX 10w-30 with a VW dealer filter (rated for 10, 000 KMs )

      I have not checked my oil levels lately as its been so damn cold, i know i could be low but not low enough where theres no oil and i hear my lifters, and i did not over fill it as well....

      95 2.0L ABA with chip 2.25" exhaust and intake. Its swapped into an 85 mk2. Should i be worried?


    2. Banned PELLA's Avatar
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      02-07-2008 03:56 PM #2
      sounds like you got yourself a blown gasket

    3. Member 89VWdieselGolf's Avatar
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      02-07-2008 04:18 PM #3
      Quote, originally posted by PELLA »
      sounds like you got yourself a blown gasket

      black smoke is fuel bud
      white is coolant (head gasket)
      blue is oil

      Jeff

      (btw, your "hydroplaining" signature is retarded)


      Modified by 89VWdieselGolf at 3:20 PM 2-7-2008

      89VWdieselGolf's Autobiography
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      02-07-2008 05:40 PM #4
      Sounds like you are running rich. When I had misfiring due to a bad coil, I had a sooty tailpipe. Right now, there is nothing there.

      I paid attention to this because my Jeep has a sooty ring around the end of it. Some on the Jeep board suggested it is normal, but I'm not buying it...


    5. Member 89VWdieselGolf's Avatar
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      02-07-2008 06:15 PM #5
      he said its only when its cold out, the motor isnt up to operating temp therefore its not completely burning ALL the fuel... its not rich. Its cold.
      89VWdieselGolf's Autobiography
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      02-07-2008 06:35 PM #6
      The mixture is rich at cold start up. Even then, it sounds like he is having more black smoke than you'd see at a cold start. Any drivability issues at all?

    7. Banned zeroman's Avatar
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      02-07-2008 11:05 PM #7
      it was like start up and rev and i looked out it wasnt a constant black cloud it was just a puff never noticed that or seen it when it was warm. I know i'm running rich as my o2 wasn't hooked up after my swap for a while and my plugs are a bit dirty and i need to change them or i'll continue to run rich

      and no, theres nothing changed in the way the car drives. pulls strong and hauls ass


      Modified by zeroman at 10:06 PM 2-7-2008


    8. Banned PELLA's Avatar
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      02-07-2008 11:13 PM #8
      Quote, originally posted by 89VWdieselGolf »

      black smoke is fuel bud
      white is coolant (head gasket)
      blue is oil

      Jeff

      (btw, your "hydroplaining" signature is retarded)


      Modified by 89VWdieselGolf at 3:20 PM 2-7-2008


      its jay-z!


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      02-07-2008 11:55 PM #9
      Quote, originally posted by 89VWdieselGolf »
      he said its only when its cold out, the motor isnt up to operating temp therefore its not completely burning ALL the fuel... its not rich. Its cold.

      Save the rolleyes next time, eh?


    10. Banned zeroman's Avatar
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      02-07-2008 11:55 PM #10
      yah its jay-z lol and hes so crappy...30 something years old!! anyways so this isn't much i have to worry about new plugs and i should be good with my running rich issue ive got.

    11. Member 89VWdieselGolf's Avatar
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      02-08-2008 09:07 AM #11
      Quote, originally posted by FL 2.0L »

      Save the rolleyes next time, eh?

      why it was already said what the problem was... and some other "diagnostic" gets posted

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      02-08-2008 06:46 PM #12
      Quote, originally posted by zeroman »
      it was like start up and rev and i looked out it wasnt a constant black cloud it was just a puff never noticed that or seen it when it was warm. I know i'm running rich as my o2 wasn't hooked up after my swap for a while and my plugs are a bit dirty and i need to change them or i'll continue to run rich

      and no, theres nothing changed in the way the car drives. pulls strong and hauls ass


      Modified by zeroman at 10:06 PM 2-7-2008

      That's why.


      Modified by FL 2.0L at 5:47 PM 2-8-2008


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      02-10-2008 06:47 PM #13
      Another possibility is that your PCV hoses are cracked and or leaking. Check the rigid plastic pipe that connects into the engine block, and the elbow pipe that connect into the pcv valve. Believe it or not if this is leaking the car will apparantly burn some oil. As soon as I discovered this I sealed any cracks and voila the oil burning is gone. like Dan Reed says those pipes/hoses only last till about 95 k or so. replace all and don't forget to replace the o ring that goes into the rigid plastic pipe to the block.


    14. 02-15-2008 06:40 PM #14
      I'm 100% stock, 18000 miles, and my friends driving behind me yesterday called me on my cell phone going down the interstate to tell me my car was putting out very black smoke when accelerating. I was at normal operating temperature.

      :X


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      02-15-2008 07:09 PM #15
      You need the MKV forum or the 2.5L engine forum...

    16. Banned zeroman's Avatar
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      02-15-2008 11:54 PM #16
      i had a crack in the PCV hard plastic pipe at one ponit in time. i fixed that along with a new crankcase breather. It was determined it was running rich due to the car not being fully warm.

      My next pet peve is the search blows for figuring out how to run a breather filter...I've got a thread for that thought trying to figure out info. I will change my plugs tomorrow to solve the rich running issue.


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      02-15-2008 11:56 PM #17
      Search for "catch can mod" or "catch can" or something similar.

    18. Banned zeroman's Avatar
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      02-16-2008 12:01 AM #18
      Quote, originally posted by FL 2.0L »
      Search for "catch can mod" or "catch can" or something similar.

      check out my other thread in this forum you seem to be alot of help


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      02-16-2008 01:23 AM #19

    20. Member mrdub27's Avatar
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      02-16-2008 10:13 AM #20
      TbH it does sound like you need to :
      A hook up that O2
      B check your fuel mixture..

      Yes the car runs rich at start up until warm but it sounds like under throttle your over fueling which is supposed to be compensated by the O2 and also maybe you need to replace the temp sensor that tells the engine ecm the coolant temp.. if it has failed it reads cold all the time it will always run rich.. my o2 went and my fuel mileage dropped badly and I also found a bad temp sensor too.. plugs started to foul quickly too.. have ya checked your plug gap.. maybe it's too big and that could also cause unburnt fuel too under throttle..

      Yes mine is MKIII but the issues like this are the same on the MKIV 's.. get someone to hok up a a/f gaugeand see if you are running rich all the time.. also I'd check the air filter.. if it's dirty it can choke the engine making it run rich too


    21. Banned zeroman's Avatar
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      02-16-2008 10:36 AM #21
      Air filter replaced yesterday, i have trouble with a stupid broken filter from its casing. The o2 sensor is hooked up I can tell when its not car idles rough. Its my plugs i have determined. Plus it was a cold start up rev.

    22. 02-17-2008 04:15 AM #22
      its just the chip. My car ran rich for a while because of the chip.

    23. Banned zeroman's Avatar
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      02-17-2008 09:02 AM #23
      i changed plugs got some NGK v powers and did a sea foam an dshe runs alot better

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