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  • 1 Post By conedoctor
2008-2013 Cadillac CTS General Discussion Discussion, black smoke in Cadillac CTS Second Generation Forum - 2008-2013; Do all DI engines blow black smoke when you are flooring the gas pedal?...
  1. #1
    dklswh is offline Cadillac Owners Member
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    black smoke

    Do all DI engines blow black smoke when you are flooring the gas pedal?

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    C "T" ess's Avatar
    C "T" ess is offline Cadillac Owners Connoisseur
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    Re: black smoke

    If it only lasts a second or two and doesn't happen every time you accelerate then; you are most likely blowing out any accumulated carbon in the exhaust system and mufflers. If it happens every time you punch it and it lasts more than just a few seconds check your oil for any excessive usage, the black smoke you see could be oil burning off.

  4. #3
    conedoctor is offline Cadillac Owners Connoisseur
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    Re: black smoke

    Black is usually poor combustion, it should not blow tons of black smoke and if it is then some fuel is not being burnt fully. As said above it may do it for a second when you stand on it but the smoke should not continue, maybe tune up time.
    99flhr likes this.

  5. #4
    tinman's Avatar
    tinman is offline Cadillac Owners Connoisseur
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    Re: black smoke

    Maybe you need an Italian Tune-up a little more often.

  6. #5
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    dhtigerfan is offline Cadillac Owners Member
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    Re: black smoke

    Quote Originally Posted by dklswh View Post
    Do all DI engines blow black smoke when you are flooring the gas pedal?
    Mine certainly doesn't.

  7. #6
    Joe
    Joe is offline Cadillac Owners Fanatic
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    Re: black smoke

    Hey dklswh,

    How often are you adding oil? Most of these engines use a little oil, because of rings, seals, guides or all of the above. How many miles on the vehicle?

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    dklswh is offline Cadillac Owners Member
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    Re: black smoke

    oil has never been down, i use synthetic, premium fuel sometime. it is not big clouds of smoke just noticeable. Car has 170000 km (106,000 mi) plugs just replaced, guess i'll keep an eye on it.
    Thanks

  9. #8
    Joe
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    Re: black smoke

    Hi dklswh,

    If you are not using oil you are way ahead of the game. Mine throws a little smoke when I punch it. Its probably carbon like C "T"ess mentioned. I do have a feeling these engines being direct injected probably push a lot of fuel into the cylinders when we get on it. I suspect also many of these high horsepower engines just cant burn it up quick enough so it gets tossed un-burned out of the tailpipe. How's your gas mileage?

  10. #9
    99flhr is online now Cadillac Owners Fanatic
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    Re: black smoke

    Conventional wisdom is that oil smoke is blue/white.

  11. #10
    conedoctor is offline Cadillac Owners Connoisseur
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    Re: black smoke

    They only push as much fuel into the cylinders as called for they just do it a bit better.

    I think mine does it but I never get a chance to floor it

  12. #11
    reciprocity is offline Cadillac Owners Fanatic
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    Re: black smoke

    I think C"T"ess is right. If I really accelerate hard (getting on the freeway from a metering light on a short onramp, for example), I definitely notice a small "cloud" of carbon. I'm pretty sure that's what it is if it's only under heavy acceleration. Just keep an eye on your oil consumption and you should be fine.

  13. #12
    sliderule01 is offline Cadillac Owners Fanatic
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    Re: black smoke

    I get the same thing. Most of my driving is in town. I do notice it more when I use regular and not premium. When I hit the pedal hard during a passing situation, I get an occasional puff of black smoke. It is not blue which suggests oil. This usually happens when I floor it quickly to pass and I get a rapid kickdown on the transmission to pass. I suspect that it is carbon build-up and I need to do an "Italian tune-up" more often.

    While people say that the use of premium is not necessary, I have documented that I do get a couple of miles per gallon better with premium with the same sort of driving by alternating tanks, and approximately 10 tanks each. I see the same thing when driving the same route on the highway with the cruise control set to the same speed. While not a big statistical sample, it is strongly suggestive.

  14. #13
    tinman's Avatar
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    Re: black smoke

    Quote Originally Posted by sliderule01 View Post
    I get the same thing. Most of my driving is in town. I do notice it more when I use regular and not premium. When I hit the pedal hard during a passing situation, I get an occasional puff of black smoke. It is not blue which suggests oil. This usually happens when I floor it quickly to pass and I get a rapid kickdown on the transmission to pass. I suspect that it is carbon build-up and I need to do an "Italian tune-up" more often.

    While people say that the use of premium is not necessary, I have documented that I do get a couple of miles per gallon better with premium with the same sort of driving by alternating tanks, and approximately 10 tanks each. I see the same thing when driving the same route on the highway with the cruise control set to the same speed. While not a big statistical sample, it is strongly suggestive.
    Interesting with your mpg. Does the extra mpg "pay" for itself with the additional cost of premium?

    GO TIGERS! (and Red Wings)

  15. #14
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    C&C
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    Re: black smoke

    There is no more energy in a gallon of premium than there is in a gallon of regular; however, if you do have some of that carbon buildup (and it is in the area of combustion) you engine may be identifying some 'ping' (with regular) and is retarding the timing a bit (lowering your mpg). Premium may in fact give some better mileage figures. I do doubt that you are saving any money (using premium) as the cost difference would negate any differences of mileage versus cost. Top-tier gasoline and an occasional engine exercise (i.e. Italian tuneup) should relegate premium to cars that call for it.

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