2014 Sierra 6.2 Denali Smoke

[ArizonaDenali]

I have a 2014 Sierra Denali 6.2 with just under 5500 miles. I have noticed a blue/black puff of smoke out of the exhaust on cold startup. I took the truck in for it's first oil change earlier this week and mentioned it to service department. They didn't seem to be concerned about it. Are other members experiencing this as well? Is this a 6.2 thing or is this happening with both the 5.3

[fondupot]

There are several posts about this topic. Do a quick search. Results are that it's normal and is related to direct injection. The motor is rich on startup and the puff of smoke you see is excess fuel being burned off.

 

See this post.

 

http://www.gm-trucks.com/forums/index.php?/topic/158170-Black-puff-of-smoke-at-start

 

 

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[14SLTZ71]

http://www.gm-trucks.com/forums/topic/158170-black-puff-of-smoke-at-start/?p=1481032

[14SLTZ71]

http://www.gm-trucks.com/forums/topic/158170-black-puff-of-smoke-at-start/?p=1481066

 

this PI list the 2014 Silverado and Sierra