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Black puff of smoke at start

jallen2014

By jallen2014
in Troubleshooting & Recalls

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Black02Silverado Senior Enthusiast

Black02Silverado

Posted
Posted

I noticed one thing on DI engines is that my used oil analysis come back with "high" fuel dilution. So with the severe cold and the fact that the dynamics of the engine getting that much more fuel to start means the cylinders are getting washed down on start up.

 

Like in the old days when I had to choke my 65 Impala's big block, it would puff black smoke out the tail pipe until I could get it to run smooth and feather the choke. It didn't like the cold one bit. Fuel injection has really made vehicle starting so much easier.

 

I wouldn't think it is normal to have black smoke puff out on start, but then it is a new design. It wouldn't hurt to get it checked out and the issue logged in to the system so if there are any issues later on down the road you have documentation while still under warranty.

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VMaxtastic Enthusiast

VMaxtastic

Posted
Posted

I noticed one thing on DI engines is that my used oil analysis come back with "high" fuel dilution. So with the severe cold and the fact that the dynamics of the engine getting that much more fuel to start means the cylinders are getting washed down on start up.

 

Like in the old days when I had to choke my 65 Impala's big block, it would puff black smoke out the tail pipe until I could get it to run smooth and feather the choke. It didn't like the cold one bit. Fuel injection has really made vehicle starting so much easier.

 

I wouldn't think it is normal to have black smoke puff out on start, but then it is a new design. It wouldn't hurt to get it checked out and the issue logged in to the system so if there are any issues later on down the road you have documentation while still under warranty.

Thank you for this insight! I have a list going for when I get days off work to take it in.

GM MAN VINCE Enthusiast

GM MAN VINCE

Posted
Posted

My truck did it this morning on startup it only has 200 miles on it and was about 35 degrees outside. I dont think it's a big deal it's hardly noticeable and even If it Is that's what the warranty Is for.

VMaxtastic Enthusiast

VMaxtastic

Posted
Posted

To me, its more what problems could arise in the future. I work at a job where I can't be stuck on the side of the road with a dead truck. That's why I buy a new truck. The stupid thing has already left me with a dead truck twice. It only has 2200 KM on it.

desrt35 Enthusiast

desrt35

Posted
Posted

I never noticed the small puff of smoke until recently. I can't say its due to cold weather, seeing how my winter hasn't been any colder than the mid 40's. With that said, I didn't notice it until the cooler weather. Usually after it has been sitting a while. (First thing in the morning) However, I also did not notice it until after the "fire recall" was performed. I have been to my dealer about it, but I received the typical "can't recreate the issue".

 

At this point it's something to keep my eye on, and it's now noted in my vehicle maintenance history.

 

 

Sent from my iPhone using Tapatalk

TJay74 Senior Enthusiast

TJay74

Posted
Posted

MY 2013 6.2 with the L9H engine was DI too and it didn't start like this, or puff black smoke.

 

Sorry to tell you this, but your 2013 6.2 if it was a GM product was not a DI engine. The only GM vehicles with 6.2 DI are the new 2014 Vette and the new 2014 1/2 ton trucks.

 

As said this is normal because of the extreme cold weather. Colder air is more dense, ECM is dumping more fuel to aid in start up otherwise the engine would be lean right upon fire up. I would also bet it is to aid in CAT light off as well with in the EPA mandated time to reduce emissions.

 

I can tell you from my research and watching my truck, winter fuel + really cold weather is good for really crappy mileage. As soon as it warms up I see immediate increases in fuel mileage once the outside temps are over 40°.

VMaxtastic Enthusiast

VMaxtastic

Posted
Posted

 

Sorry to tell you this, but your 2013 6.2 if it was a GM product was not a DI engine. The only GM vehicles with 6.2 DI are the new 2014 Vette and the new 2014 1/2 ton trucks.

 

As said this is normal because of the extreme cold weather. Colder air is more dense, ECM is dumping more fuel to aid in start up otherwise the engine would be lean right upon fire up. I would also bet it is to aid in CAT light off as well with in the EPA mandated time to reduce emissions.

 

I can tell you from my research and watching my truck, winter fuel + really cold weather is good for really crappy mileage. As soon as it warms up I see immediate increases in fuel mileage once the outside temps are over 40°.

Well that was the excuse the shop gave me as to why it was ticking like it was going to explode... I'm not even joking. I didn't think it was either.. The puffing of black smoke is not normal. I've lived in a cold climate my entire life and this is the first time Ive seen this with any vehicle

fondupot Senior Enthusiast

fondupot

Posted
Posted

Well that was the excuse the shop gave me as to why it was ticking like it was going to explode... I'm not even joking. I didn't think it was either.. The puffing of black smoke is not normal. I've lived in a cold climate my entire life and this is the first time Ive seen this with any vehicle

 

But how many Direct Injection vehicles have you had? This is a DI characteristic.

VMaxtastic Enthusiast

VMaxtastic

Posted
Posted

 

But how many Direct Injection vehicles have you had? This is a DI characteristic.

Just this one I guess. But my '13 6.2 was ticking after about 4000 km. When I traded it off in january, it had 40,000 km, and it sounded like to motor was going to pile up. They kept telling me it's supposed to sound like that, due to it being direct injection. This was on a '13 Sierra, and GM techs. The '13 wasn't blowing black smoke. It just sounded like it had bad lifters to me. Dont ask me why I bought another GM after that experience, I dont know myself.

fondupot Senior Enthusiast

fondupot

Posted
Posted

Just this one I guess. But my '13 6.2 was ticking after about 4000 km. When I traded it off in january, it had 40,000 km, and it sounded like to motor was going to pile up. They kept telling me it's supposed to sound like that, due to it being direct injection. This was on a '13 Sierra, and GM techs. The '13 wasn't blowing black smoke. It just sounded like it had bad lifters to me. Dont ask me why I bought another GM after that experience, I dont know myself.

 

lol that 2013 6.2L was NOT direct injection. It was just standard port injection. Whatever techs told you that are idiots. If that motor was ticking badly, there was definitley something wrong with it.

VMaxtastic Enthusiast

VMaxtastic

Posted
Posted

I was so tired of pursuing it I just got rid of it. Took it into the shop 3 times over that.

 

Now here I am, once again.

bigblzr94 Enthusiast

bigblzr94

Posted
Posted

Well here you all go, mine has sat for 3 days and I go to start and was looking for it and yes black smoke on start up. I did not have an extended crank time but did have the smoke. Also for everyone it was 80deg. today and started her in the afternoon. I am taking it to the dealer Tuesday for the rear end shaking, shaking under harder acceleration, and I will have them check this out. It also seems to shift really hard some times. I am at 1200 miles.

20L8TSierra24 Senior Enthusiast

20L8TSierra24

Posted
Posted

Its "Normal" lol. As someone once said at my dealer "we are the test mules". Mine smokes too and I live in south Florida. Mine as I said before smoked before and after recall reprogramming. I just stopped worrying about it and if something is wrong, I'll hear about it on the site here.

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