Random Blue Smoke at startup
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Cadillac Escalade, EXT and ESV Forum - 2007-2014 Discussion, Random Blue Smoke at startup in Cadillac Escalade Forums; I get a plume of blue smoke at startup sometimes. Not often but it happens and I dont like it. ...
  1. #1
    cudaz101 is offline Cadillac Owners Member
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    Random Blue Smoke at startup

    I get a plume of blue smoke at startup sometimes. Not often but it happens and I dont like it. Wondering if anyone else has had the same thing. It doesnt burn oil, just made a 800mile trip last weekend and the oil level stayed the same.

    Ive not seen it smoke during driving, only at random startup. Fuel mileage and general performance is great as well.

    Thanks in advance!!

    Brad

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    MrHolland's Avatar
    MrHolland is online now Super Moderator
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    Re: Random Blue Smoke at startup

    What year is your car???

  4. #3
    wesyder's Avatar
    wesyder is offline Cadillac Owners Connoisseur
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    Quote Originally Posted by cudaz101
    I get a plume of blue smoke at startup sometimes. Not often but it happens and I dont like it. Wondering if anyone else has had the same thing. It doesnt burn oil, just made a 800mile trip last weekend and the oil level stayed the same.

    Ive not seen it smoke during driving, only at random startup. Fuel mileage and general performance is great as well.

    Thanks in advance!!

    Brad
    Possible intermittent leaking injector maybe try a pour in the tank fuel system cleaner

  5. #4
    the blur's Avatar
    the blur is offline Cadillac Owners Enthusiast
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    Re: Random Blue Smoke at startup

    Blue is oil. leaking injectors (fuel) is black. You probably need valve seals, which will only blow oil when the motor is COLD.
    K9Caddy likes this.

  6. #5
    AZKlaus is offline Cadillac Owners Fanatic
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    Re: Random Blue Smoke at startup

    Correct on the valve stem seals. If the seals are on their way out after the car cools down the seals will contract dripping just a few drops of oil into the combustion chamber and then when you start the car that oil will burn. At that point the seal will re-expand and "plug" the leak. I'm actually surprised your running into this, GM's 06+ v8s use very strong valve seal material, I'm curious how many miles you have?

    As for what to do about it. A well built motor can potentially go another 50k on seeping valve seals. It's when you start getting blue puffs when the motor is warm that you really have to worry as that point the seals are no longer reswelling enough to seal the combustion chamber and you'll run into all sorts of issues including low compression. Again it can be as long as another 50k before this happens. But I would certainly address it sooner than that. Get some estimates on replacing them and do it when you're ready sometime within the year. Good luck!

  7. #6
    the blur's Avatar
    the blur is offline Cadillac Owners Enthusiast
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    Re: Random Blue Smoke at startup

    Me personally, I'd never replace them, as a morning puff of blue does nothing. All my 1980's era Chevy's did it, and it still puffs blue till this very day. 100,000 miles later, it's no worse.

  8. #7
    AZKlaus is offline Cadillac Owners Fanatic
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    Re: Random Blue Smoke at startup

    Quote Originally Posted by the blur View Post
    Me personally, I'd never replace them, as a morning puff of blue does nothing. All my 1980's era Chevy's did it, and it still puffs blue till this very day. 100,000 miles later, it's no worse.
    Valid point, and the valve material then wasn't nearly as durable as they are now. My 94 Supra's original engine had it for about 40k miles before it starting getting worse and I eventually started losing compression and blue puffs while driving so for that and other reasons I rebuilt it with Viton valve seals and I expect those to last the duration even with very high cylinder pressures from the turbocharged application.

    The L92 in your truck is a 10.5:1 compression so is a higher performance application and will wear down a seeping seal faster than a commuter engine. But absolutely, you can wait until you actually see some adverse effects before you do anything about it, most likely it's going to be a while

  9. #8
    the blur's Avatar
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    Re: Random Blue Smoke at startup

    Quote Originally Posted by AZKlaus View Post
    Valid point, and the valve material then wasn't nearly as durable as they are now. My 94 Supra's original engine had it for about 40k miles before it starting getting worse and I eventually started losing compression and blue puffs while driving so for that and other reasons I rebuilt it with Viton valve seals and I expect those to last the duration even with very high cylinder pressures from the turbocharged application.

    The L92 in your truck is a 10.5:1 compression so is a higher performance application and will wear down a seeping seal faster than a commuter engine. But absolutely, you can wait until you actually see some adverse effects before you do anything about it, most likely it's going to be a while
    You'll never loose compression from a bad valve seal.

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    cudaz101 is offline Cadillac Owners Member
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    Re: Random Blue Smoke at startup

    Thanks for the feedback guys. I should have given more information to glean from.

    2007 with 105K on it. It runs great, doesnt require adding oil between changes (3Kmi.). Fuel mpg is at 19mpg hwy and 14city.

  11. #10
    AZKlaus is offline Cadillac Owners Fanatic
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    Re: Random Blue Smoke at startup

    Quote Originally Posted by the blur View Post
    You'll never loose compression from a bad valve seal.
    When the valve seals go to the point of causing burned valves yes they absolutely can

    ----------

    Quote Originally Posted by cudaz101 View Post
    Thanks for the feedback guys. I should have given more information to glean from.

    2007 with 105K on it. It runs great, doesnt require adding oil between changes (3Kmi.). Fuel mpg is at 19mpg hwy and 14city.
    Yeah we're really talking about a tiny amount of oil, maybe a couple tablespoons between changes if that so nothing that would be really noticeable. Just keep an eye on it, you'll be in good shape!

  12. #11
    K9Caddy is offline Cadillac Owners Enthusiast
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    Re: Random Blue Smoke at startup

    Quote Originally Posted by AZKlaus View Post
    When the valve seals go to the point of causing burned valves yes they absolutely can

    ----------



    Yeah we're really talking about a tiny amount of oil, maybe a couple tablespoons between changes if that so nothing that would be really noticeable. Just keep an eye on it, you'll be in good shape!
    Are you talking about the intake or exhaust valve seats in the combustion chamber? Quite different than the valve seals that are located under the valve covers in the upper head.

  13. #12
    AZKlaus is offline Cadillac Owners Fanatic
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    Re: Random Blue Smoke at startup

    Quote Originally Posted by K9Caddy View Post
    Are you talking about the intake or exhaust valve seats in the combustion chamber? Quite different than the valve seals that are located under the valve covers in the upper head.
    No not the seats, the valve stem seals that prevent oil from leaking into the intake/exhaust ports

  14. #13
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    Re: Random Blue Smoke at startup

    A little bit of oil acts as a pre-lubricant, so it actually extends the life of your engine.

  15. #14
    Nice Ride is offline Cadillac Owners Fanatic
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    What oil are you using? Just curious...

  16. #15
    hollingass is offline Cadillac Owners Member
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    The valve stem seals NEVER have to deal with combustion chamber pressures during the compression stroke, that is the purpose of the actual valve and seat, those seals just prevent excess oil from seeping down the valve stem and ultimately into the combustion chamber when the valve is open, it is almost certain there will be a few valves open even when the engine is shut off.
    So no, the partial or complete failure of valve stem seals will not cause a loss of compression

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