[Colt_H]

Hey Guys - a search didn't give me much info on this, sorry if I missed it.

Here is a quick video of my 2017 2SS starting up with a few gentle throttle blips. It seems like an excessive amount of black smoke. There are 300 miles on the car and I've been following the break-in process (some full throttle accelerations, but never over 4,000 rpm). The little I've read on here references a little smoke possibly being caused by residue in the exhaust "burning off", but this seems to be a bit much. Thoughts?

[6spdhyperblue]

its called tip-in. its fine. black is fuel, you're good to go.

is the engine totally up to operating temp when youre doing that?

[Colt_H]

Originally Posted by Nicul15

its called tip-in. its fine. black is fuel, you're good to go.

is the engine totally up to operating temp when youre doing that?

No, this was a cold start. Do you think those blips to like 2,5000 rpm are bad for it?

[6spdhyperblue]

Originally Posted by Colt_H

No, this was a cold start. Do you think those blips to like 2,5000 rpm are bad for it?

its probably fine, but the "choke" is still on lol...cold engine = more than usual fuel = black smoke.

i personally don't do anything other than gentlegentlegentle until its totally up to temp

[Megahurtz]

I would only be concerned if it does this when the car is warmed up. When its a cold start the CATs are not operating yet(they have to be at a certain temp to actually function) and the fueling is richer than normal.

[Captain Obvious]

Originally Posted by Colt_H

No, this was a cold start. Do you think those blips to like 2,5000 rpm are bad for it?

They certainly aren't good for it. Cold oil is thick and will struggle to sufficiently lubricate.

[iPODFAN11]

Normal.

#PIP5189B: Black Smoke On Cold Start

Models: 2015-2016 Cadillac Escalade
2016 Cadillac CTS-V
2016 Chevrolet Camaro
2014-2016 Chevrolet Corvette, Silverado
2014-2016 GMC Sierra
2015-2016 GMC Yukon / XL
2015-2016 Chevrolet Tahoe, Suburban
With engines 4.3L, 5.3L, 6.2L L83, L86, LT1, LT4, LV3

The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.

Condition/Concern

With the introduction of direct fuel injection systems, GM has revised the cold start control system to reduce cold start emissions.

Quicker catalytic converter heating helps meet the ever changing emission requirements and improve fuel economy.

Recommendation/Instructions

A dual-pulse injection strategy is utilized during engine cold start to reduce the time required to bring the catalytic converter up to operating temperature.

This split injection strategy lasts for about 60 seconds on cold start.

This process may cause the customer to see increased black smoke, soot, during cold start andshould be considered normal.

The use of TOP TIER fuels lessens the effects during dual pulse injection by reducing the amount of carbon on valve train components and a more complete combustion leading to cleaner burn.

This cold start strategy is enabled upon start up after the engine has soaked for sufficient time such that the catalytic converter requires rapid reactivation.

Please follow this diagnostic or repair process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed.

[Colt_H]

Originally Posted by iPODFAN11

Normal.

Great info. Thank you!!

[bryguycbr]

Originally Posted by iPODFAN11

Normal.

Good info...............