Black Carbon residue in my tail pipe is this normal?
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Cadillac DeVille 1985 to 2005 including:
1985-1992 Fleetwood, 1993 Sixty Special, All FWD Forum Discussion, Black Carbon residue in my tail pipe is this normal? in Past Cadillac Vehicle Discussion; As the title says. I have a black residue in both tail pipes when I run my fingers through them. ...
  1. #1
    redoxy is offline Cadillac Owners Fanatic
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    Black Carbon residue in my tail pipe is this normal?

    As the title says. I have a black residue in both tail pipes when I run my fingers through them.
    And this is not just a tiny bit but rather "thick" residue that I have to rub of multiple times to get it off my fingers.

    I checked my truck (and 02 explorer with a similar 4.8l V8) and nothing like that in the tail pipe. By comparison I would call the tail pipe of the explorer "clean"

    Is this normal? I don't know if this will help but my deville has 290k km (~180k miles)
    The explorer has 270K km (168k miles) on them.

    Is it something I should worry about?

    PS. I don't have any driveability issues at all.

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    MoistCabbage's Avatar
    MoistCabbage is offline Cadillac Owners 10000+ Posts
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    Does the engine consume excessive oil?

    You could check for a leaky FPR.

    Otherwise, don't worry about it.

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    redoxy is offline Cadillac Owners Fanatic
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    Re: Black Carbon residue in my tail pipe is this normal?

    Quote Originally Posted by MoistCabbage View Post
    Does the engine consume excessive oil?

    You could check for a leaky FPR.

    Otherwise, don't worry about it.
    Haven't paid much attention to how much oil it consumes but it definitely consumes since I have had to top it off with about a litre of oil once in a while (maybe after about 1000 km or more). majority of my commute is city driving.

    Last I checked the FPR had no leaks but will do that again later today.

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    Submariner409's Avatar
    Submariner409 is offline If it won't run, chrome it
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    Re: Black Carbon residue in my tail pipe is this normal?

    ............ and when you "top it off", do not fill above the normal oil level line on the dipstick ............

    <===== ADD XXXXXXXXXX OPERATING RANGE =====================================O

    The engine takes 7.5 quarts of oil with filter and that brings the oil to that mark. Read the article in the Cadillac Technical Archive way up inthe black bar ^^^ or find the Cadillac/GM Technical Service Bulletin concerning oil comsumption and proper level.

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    redoxy is offline Cadillac Owners Fanatic
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    Re: Black Carbon residue in my tail pipe is this normal?

    Yep. I have never filled it past the proper level. Thanks to this forum.

    From the replies I'm guessing the excessive carbon residue may be due to oil consumption.
    Any remedies or I should just live with?

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    Submariner409's Avatar
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    Re: Black Carbon residue in my tail pipe is this normal?

    Hmmmmm.............. What type of driving (predominantly) ? City (lots of black), suburban (somewhat less), open highway (almost none).

    BUT, your use of a quart in ~600 miles is excessive. GM's current oil consumption (worst case) for engines in warranty with <36,000 miles is one quart in 2,000 miles. (But, 180,000 miles is up there ............ ) For comparison, my 2002 STS (65,000 miles) gets over 6,000 miles to the quart, and that's mostly open highway.

    Read the article "Occasional full throttle operation is good ........." in the Cadillac Technical Archive also. If you decide to "exercise" the engine, give the fuel system a little cleaning at the same time - dump a 20 oz. jug of Chevron TECHRON in the fuel tank with a fill-up. The wide open throttle runs will move the maximum amount of fuel (and cleaner) through the injectors and fuel pressure regulator.

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    redoxy is offline Cadillac Owners Fanatic
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    Re: Black Carbon residue in my tail pipe is this normal?

    Majority of my driving is city (I think about 80 of the time).

    I do the occasional WOT, but havn't done it in a couple of months.
    Regarding the Chevron Techron, it is not available in my city so if I need a fuel system cleaner it would have to be another brand.
    The ones available here are STP, Gunk, Gumout and Rislone.
    I don't know if anyone has experience with any of these products to recommend one.

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    Re: Black Carbon residue in my tail pipe is this normal?

    No fuel additive is going to do any thing. I think you are chasing a boogie man.

  10. #9
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    Re: Black Carbon residue in my tail pipe is this normal?

    I was shooting for a sticky fuel injector ......

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    brougham is offline Cadillac Owners Master
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    Re: Black Carbon residue in my tail pipe is this normal?

    There's always going to be some black in the tail pipes and it never wipes off fingers easy. It's not going to be perfectly clean in there. Unless you are burning something excessively don't worry about it.

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