Exhaust smoking on startup.. 75 degrees outside

[Slo281]

I have noticed my exhaust smoking at startup and it's 75 degrees in the morning. I have video for the dealer and don't know if this is normal or not. I have never owned a gm vehicle so didn't know if this is common or if I need to take it in. It seems to do it every morning and this morning it was a longer duration than I've noticed. Truck is a 5.3 reg cab

[TJay74]

Normal for the new DI engines, part of the enrichment process to aid in start up.

[Slo281]

Thanks Man U saved me some stressing

[fondupot]

Yep. 100% normal. Mine does it too, as will all these new DI engines. Should just be a quick puff on start up.

 

But if the smoke is lasting longer than a few seconds....there might be a larger issue.

[Slo281]

Yep. 100% normal. Mine does it too, as will all these new DI engines. Should just be a quick puff on start up.

 

But if the smoke is lasting longer than a few seconds....there might be a larger issue.

Today it lasted longer than 30 seconds ! Should I be worried ?

[fondupot]

Today it lasted longer than 30 seconds ! Should I be worried ?

Was it black smoke for 30 seconds or was it just white vapor/steam?

 

 

Sent from my iPhone.

[Slo281]

Was it black smoke for 30 seconds or was it just white vapor/steam?

Sent from my iPhone.

It is white not black

[fondupot]

Then are you sure it's not just steam/vapor?

 

The hot exhaust gases passing through the "cold" exhaust system will create condensation and steam. The aluminum that makes up the exhaust piping is going from "cold" to hot, relatively fast.

Sent from my iPhone.

[Slo281]

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

 

this PI list the 2014 Silverado and Sierra

Smoke is white not black

[14SLTZ71]

Smoke is white not black

oh, shoot, I should have read more in detail. My bad........

[Slo281]

oh, shoot, I should have read more in detail. My bad........

No prob bro