2016 High Country SMOKING, Shame on GM Switching to Ford

[gilles81]

Pressure test was normal dealer said it is from the extra fuel dump on start up and totally normal.

[BigBadSierra]

The only comment I have is do you drive it a good distance every day or short trips to work and it never really heats up.

 

You will not believe how much condensation can build up in the exhaust.

 

My mother's 2012 Impala was doing this but she would start it and drive 1/4 KM to work then home at night.

 

The fix for her was just remote starting it every morning and letting it warm up before she went.

 

Then also deliberately driving it somewhere once or twice a week.

 

The funny thing is they drive it more now that she is retired ha ha.

[truckguy82]

Mine had white smoke during start-up until I got tuned. I figured it was condensation, but a tune wouldn't fix that.

['17 Sierra]

It sure wouldn't hurt GM to put an oil catch can on these motors. I've pulled out a significant amount of oil that otherwise would have made it into the intake. I have to wonder if this is part of your problem.

If GM believed that catch cans would really help that much, they'd be on there and the amount of oil that gets past the PCV system is so small, it wouldn't have any visible smoke. I'm not saying that catch cans don't help either. I've seen catch can posts on the Corvette forums and the Harley forums but have yet to see any documented proof of them; fake proof but not real proof. I rerouted the breather on my Harley to vent to the atmosphere and I am contemplating putting a catch can on my truck but again, I'm not sure that it really makes a difference. If it does make a difference, direct injection would be the biggest reason to have it.

[gilles81]

I drive it at least 30 min usually... and it does it in the summer or when its 5 degrees out.. cold start or when warmed up... It is A LOT of smoke with a good hang time for it to just be condensation as far as i am concerned.

[Dnt]

The OP stated that when he parked the truck inside his garage that when it does this it fills up his garage and sets off the smoke alarms INSIDE HIS HOUSE so it is not just condensation, it contains a LOT of hydrocarbons either unburnt fuel or oil.

How many miles are on the truck and which engine is in the truck? Have you noticed a loss of oil on the dipstick between oil changes? (if you have had any oil changes)

[gilles81]

Its the 5.3 and I have about 13k on it now.... Now what the dealer said and gm said it does dump extra fuel to heat up the system faster on start up... Ok i get that but i think sometimes it might be dumping way to much fuel and that is what is causing the smoke issue..... The system is set up to block any check engine codes during this process so its not throwing a code... Quite stupid set up to be honest. It is by no way normal I would never have got it and spent this kind of money on it if i was told hey dont park it in a garage we got this new fancy way of starting and sometimes it could look like the marines popped smoke on a battle field but hey its totally normal... enjoy...

[Dnt]

I have about 13,000 miles on this 16 6.2 and drove my 14 5.3 over 61,000 miles and never ever got that kind of smoke on start up. NOT NORMAL. Only thing I have ever seen was a puff of black smoke... If you have remote start see if you can catch a GOOD video on your phone next time it does this. I would use that to prove my point, it seems that the issue is that your dealerships service guys cannot reproduce it so to them it does not exist. I had a 2009 5.3 that was an oil burner, it would smoke like a coal train upon start up after sitting for a few days. The dealer worked on it a few times and I just got sick of it sitting at the service department in pieces all the time and traded it in at 87,000 miles. Check out this pic of the oil fouled spark plug not sure of the cylinder number but was second one from front on drivers side.

[SirManny]

If GM believed that catch cans would really help that much, they'd be on there and the amount of oil that gets past the PCV system is so small, it wouldn't have any visible smoke. I'm not saying that catch cans don't help either. I've seen catch can posts on the Corvette forums and the Harley forums but have yet to see any documented proof of them; fake proof but not real proof. I rerouted the breather on my Harley to vent to the atmosphere and I am contemplating putting a catch can on my truck but again, I'm not sure that it really makes a difference. If it does make a difference, direct injection would be the biggest reason to have it.

Go look under the hood of the Z28 Camaro and you will see an insanely large factory catch can. So GM knows there is an issue with oil going back into the intake and so forth. I agree all direct injection vehicles should have one to help keep the top end clean.

[NoProblem]

 

There is one of the videos

 

Here is another.

 

I am not home but have another longer one of it doing it in the garage i can upload once i get to wifi ...

 

What a friggen travesty! I'd be fuming (no pun intended).

 

That smokes almost as bad as my mid 70s Datsun B210 I had as a kid - left a trail of smoke wherever I went. If the motor was running while the car was standing still, there was zero visibility in under a minute.

[hairybumcrack]

My '14 has a puff of smoke no matter what the temp is and it varies from white to grey (carbon). My mileage is mostly highway driving and I have just over 32000 miles on it now.

 

Wondering whether it could be the grade of gas you are filling up with. I typically use Shell 87 octane and I won't come near no-name or crappy gas stations given who knows how good their underground tanks are for keeping water out.

['17 Sierra]

Go look under the hood of the Z28 Camaro and you will see an insanely large factory catch can. So GM knows there is an issue with oil going back into the intake and so forth. I agree all direct injection vehicles should have one to help keep the top end clean.

That can you're talking about on the Z28 could be the oil reservoir for the dry sump system that the LS7 has.

GM did some mods to the valve covers on the gen 5 motors that are supposed to minimize the oil mist in the crankcase vapors that replicates what a catch can does. I'd love to see a comparison of with and without an oil catch can after a bunch of miles done by someone other than a catch can manufacturer.

[sdeeter19555]

If GM believed that catch cans would really help that much, they'd be on there and the amount of oil that gets past the PCV system is so small, it wouldn't have any visible smoke. I'm not saying that catch cans don't help either. I've seen catch can posts on the Corvette forums and the Harley forums but have yet to see any documented proof of them; fake proof but not real proof. I rerouted the breather on my Harley to vent to the atmosphere and I am contemplating putting a catch can on my truck but again, I'm not sure that it really makes a difference. If it does make a difference, direct injection would be the biggest reason to have it.

Before my catch can, if I parked the truck just right it would belch blue smoke on startup. My dad's Ram does this too...

 

It's the buildup in the intake tract that get sucked into the cylinder that smoke...not the vapor.

 

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[Dnt]

Hopefully gilles81 will come back with a good video of the tailpipe at startup soon. It sounds like it only does this once every few weeks.

[gilles81]

It does it about once a month and when it does its bad.... Sadly i have my cellphone set to camera every morning now waiting for it to happen again.... I will post one as soon as i get one.... I do have another one from behind my truck while it was doing it in my old phone i will have to see if i can find it.