White Smoke from Exhaust
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Thread: White Smoke from Exhaust

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    Junior Member theonlybuster's Avatar
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    Default White Smoke from Exhaust

    While sitting at the red light the other day I noticed white smoke coming from my exhausts on my 200S.
    I thought nothing of it and keep going. I noticed the issue was still there the next morning, drove around a bit and kept and eye on it and it never stopped. It's not thick, but sitting at a red light in 75 degree weather, it looks like the car is in 30 degree weather because of the constant flow of white smoke.
    Any idea what could be causing this? I'm not noticing any liquids on my driveway, so I doubt anything is leaking. Additionally, I can confirm that the smoke is coming from the exhaust, not generally under the car.
    The car has about 10k miles on it.

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    IHI
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    Quote Originally Posted by theonlybuster View Post
    While sitting at the red light the other day I noticed white smoke coming from my exhausts on my 200S.
    I thought nothing of it and keep going. I noticed the issue was still there the next morning, drove around a bit and kept and eye on it and it never stopped. It's not thick, but sitting at a red light in 75 degree weather, it looks like the car is in 30 degree weather because of the constant flow of white smoke.
    Any idea what could be causing this? I'm not noticing any liquids on my driveway, so I doubt anything is leaking. Additionally, I can confirm that the smoke is coming from the exhaust, not generally under the car.
    The car has about 10k miles on it.
    Smoke out of the exhaust can be one of two things
    oil seeping past valve guides or piston rings
    head gasket going out and coolant getting into cylinders

    I would start monitoring oil level as well as coolant level for the next few days and see which if any is dropping.

    Another possible idea would be part of the egr system that can be getting blow by sucked back into the intake track..again, not a good thing either. You can either take it to a shop and have them perform a coolant system pressure test and/or cylinder pressure leak down test...or kind of play it out and keeping an eye on oil and coolant levels to help pinpoint the problem.

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    White smoke would be an internal coolant leak, oil burns blue-ish. White exhaust fumes would be considered normal on cold mornings/days but if you still have smoke coming out on a 75 degree day, I'd say you earned yourself a trip back to the dealer! Does the exhaust have a sweet smell? keep an eye on the coolant reservoir.

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    Was it a lot or just...noticeable?

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    Check the underside of your oil filler cap. If there is a white-ish substance, you likely have a coolant leak. I've never personally seen this, but I understand it is also possible if you start the car frequently for short trips in which the oil does not warm up properly before the engine is shut down. This is hard on oil and thus hard on any engine. Watch your coolant levels; if they remain fine and you acknowledge that your engine rarely has time to fully warm up, either try to change your driving habits or change your oil according to a heavy-duty cycle (more frequently).

    If you do think you are burning coolant, however, a visit with the dealer is your likely solution.
    2011 Limited V6

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    I am gonna say it was condensation in the exhaust pipes, or a humid day. I have seen this happen with several vehicles on days where there is higher humidity, especially in the dawn and dusk hours.

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