'08 Silverado, smoke upon start up

Discussion in 'Chevy Silverado Forum (GMC Sierra)' started by BlackBowtie, Mar 4, 2013.

  1. BlackBowtie

    BlackBowtie New Member

    Hey guys,
    I noticed today that upon start up, I saw 3-4 seconds of white smoke.
    What could cause this?
  2. RayVoy

    RayVoy Epic Member 5+ Years 5000 Posts

    If it was a cold morning, it's just condensation.
  3. j cat

    j cat Epic Member 5+ Years 1000 Posts

    on a cold start you will see water vapor , and even see water draining out the mufflers. if the engine is hot and you see white vapor that would be coolant. also it will have a smell to it.
  4. Kuntryboy

    Kuntryboy Member

    if the smoke was blueish then its probably a leak of some sort.
  5. BlackBowtie

    BlackBowtie New Member

    It did have a blueish hue. It was definitely something being burned off.
    where would the leak be coming from?
  6. RayVoy

    RayVoy Epic Member 5+ Years 5000 Posts

    If the engine is cold, there is no exhaust heat to burn off any fluid.
    If the engine is hot, it is probably engine oil.
  7. BlackBowtie

    BlackBowtie New Member

    Ok, so let me put this all together.
    I know it's engine oil because I'm always down 2 quarts within a span of 5,000km.
    Yes, this issue is happening at cold starts. This morning I stood behind it, used the remote start and thick, white, blueish smoke came out for 2-3 seconds, then exhaust vapours.
  8. j cat

    j cat Epic Member 5+ Years 1000 Posts

    the blue smoke on first starting was 100% on the chev/GM 305CU engines. the valve guides GM did not properly machine to prevent this. with a 2008 engine my guess would be a valve issue, possible seals.

    if you have the AFM this may be serious . can also be the valve cover internal PCV system. may have had this fail with the use of non GM approved engine oils. sludge forms causing the crankcase venting system to not work correctly.

    oil usage with the crankcase venting system failure is what happens.
    Last edited: Mar 7, 2013
  9. geo1

    geo1 Member 100 Posts

    I agree with j cat,one question for you is ,do you idle alot.amotor at idle is at high vacuum,pulling oil past valve seals.try shutting down quicker on end of commute to see if smoke lessons

    - - - Updated - - -

    add to; this is not operator error,simply a diagnostic aid in youre oil consumption
  10. Enkeiavalanche

    Enkeiavalanche Loving the Outdoors Staff Member 5+ Years ROTM Winner 5000 Posts

    Sounds Very familiar :grrrrrr: Do you have AMF? Have you seen blue smike out the back when driving at highway speeds? How many miles do you have?

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