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Thread: 2000 DTS exhaust smoke after sitting for a month

  1. #1
    caddi2323 is offline Cadillac Owners Member
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    2000 DTS exhaust smoke after sitting for a month

    Hi, I have a 2000 DTS 145,000 Miles on the motor and 182,000 Miles on the body due to the known headgasket issues on the Northstars, the engine was replaced a few years ago.

    I let the car sit for a month before I planned on selling it, the day I planned on advertising it I charged the battery and when I started it, it began to smoke, heavy white smoke from the Tailpipes that wont stop.

    Is this another headgasket failure and how if the car was sitting? If not what could be the issue? Please help, because this might just go from a driver to a parts car SMH.


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  3. #2
    Submariner409's Avatar
    Submariner409 is offline If it won't run, chrome it
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    Re: 2000 DTS smoking after sitting for a month

    Where are you, what is the outside air temperature, and is your engine's coolant level dropping or steady ?

  4. #3
    caddi2323 is offline Cadillac Owners Member
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    Re: 2000 DTS smoking after sitting for a month

    Quote Originally Posted by Submariner409 View Post
    Where are you, what is the outside air temperature, and is your engine's coolant level dropping or steady ?
    This was two weeks ago and it was about 25 Degrees and the coolant level was steady.

  5. #4
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: 2000 DTS exhaust smoke after sitting for a month

    If it still does it, start it up, go back there and tell us if it smells like smoke (engine oil), coolant or gas.

  6. #5
    caddi2323 is offline Cadillac Owners Member
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    Re: 2000 DTS exhaust smoke after sitting for a month

    It smells like burning coolant.

  7. #6
    MoistCabbage's Avatar
    MoistCabbage is offline Cadillac Owners 10000+ Posts
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    "Heavy" white exhaust that smells like coolant is hard to argue with. If you want to be sure though, do a block test.

    The engine doesn't have to be running for gaskets/bolt hole threads to fail.

  8. #7
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: 2000 DTS exhaust smoke after sitting for a month

    OH OH! I was going to say time for a block test, but I'm not sure that is even necessary at this point.

    Is this another headgasket failure and how if the car was sitting?
    Coolant seeps into the cylinder through the HG breach (once it is bad enough), pools in the cylinder and when started, it gets pumped out of the exhaust in the form of steam. Depending on just how bad this breach is, you want to be careful of letting it sit for long periods. In theory, if the breach is bad enough for coolant to flow into the cylinder, and it does so enough to fill the cylinder to the point that it hydrolocks upon cranking, it is possible to bend a rod. You might want to start it daily (if you intend on repairing it as opposed to swapping out motors).

  9. #8
    99Classillac's Avatar
    99Classillac is offline Cadillac Owners Enthusiast
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    Re: 2000 DTS exhaust smoke after sitting for a month

    Ouch. Whas this Northstar motor you bought already studded before install or was it factory with no studs?

  10. #9
    Caddy-EaRL's Avatar
    Caddy-EaRL is online now Cadillac Owners Enthusiast
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    You may have had better luck with the original engine. To replace an engine with no head gasket issue is just silly, going on the premise that they will fail is totally inaccurate. Most don't fail. The failure rate is way over exaggerated. Just sayin.
    Last edited by Caddy-EaRL; 04-17-14 at 01:18 PM.

  11. #10
    caddi2323 is offline Cadillac Owners Member
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    Re: 2000 DTS exhaust smoke after sitting for a month

    Ok I let the car sit for another week and started it again with no smoke, no smell and everything is fine. I drove the car for the past 2 days with no issues, I can't believe it, what the hell happened lol.

  12. #11
    basscatt's Avatar
    basscatt is online now Cadillac Owners 10000+ Posts
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    Re: 2000 DTS exhaust smoke after sitting for a month

    Quote Originally Posted by caddi2323 View Post
    Ok I let the car sit for another week and started it again with no smoke, no smell and everything is fine. I drove the car for the past 2 days with no issues, I can't believe it, what the hell happened lol.
    ==============================
    if you ever had it BLESSED -
    call the POPE -
    we might have another GENUINE MIRACLE -

    SAINT POLARIS - the Protector of Northstars -

  13. #12
    Submariner409's Avatar
    Submariner409 is offline If it won't run, chrome it
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    Re: 2000 DTS exhaust smoke after sitting for a month

    The mice that built the nests in the exhaust pipes have finally burned up.

  14. #13
    SGWORLDWIDE Guest
    Quote Originally Posted by caddi2323 View Post
    Ok I let the car sit for another week and started it again with no smoke, no smell and everything is fine. I drove the car for the past 2 days with no issues, I can't believe it, what the hell happened lol.
    Now get rid of it asap lol

  15. #14
    markmnj's Avatar
    markmnj is offline Cadillac Owners Fanatic
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    Re: 2000 DTS exhaust smoke after sitting for a month

    Perhaps it wasn't coolant/HG related. Burning coolant smells nice 'n sweet kinda like a hot steaming pancake breakfast with lots of syrup. Take the Caddy out on a nice long steep highway hill where you can floor it for a good stretch of road while peeking at the temp needle. It shouldn't climb at all (my definite non-leaking Northstar stays at 12 o'clock).

    Let it sit overnight and check for pressure remaining in the cooling system prior to starting the car, engine completely cooled. Do so by squeezing the radiator hoses At that point there should be ZERO pressure and hoses should be soft. At that same point gently remove the radiator cap or lift the lever if you have one. It should not hiss like a bottle of soda opening. It's a closed system and any pressure in there at that point has been introduced by other means (combustion gases being forced in). The only symptom I had prior to repairing was a slight momentary morning misfire and pressure in the cooling system after sitting overnight. No overheating, no apparent coolant loss.

    Submariner, that's pretty funny When I started up my '73 after this winter it sneezed out a mouse from it's left pipe.


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