Jump to content

Black puff of smoke at start

jallen2014

By jallen2014
in Troubleshooting & Recalls

Recommended Posts

jackl4 Enthusiast

jackl4

Posted
Posted

I'm still waiting on my 2015 order so please excuse me if I lack street cred but.....The tolerances on these newer motors are very tight. If you've done much engine work, you would appreciate that the motor starts up rich and heats slower than if it were lean. Hence, the black smoke.

 

As long as the smoke is not blue, I'll be happy. JMHO

  • Replies 80
  • Created
  • Last Reply
14SLTZ71 Enthusiast

14SLTZ71

Posted
Posted

Most likely steam. Condensation builds up inside the exhaust after it sits, and when you start the motor, the heat vaporizes the condensation creating steam.

 

But if its HUGE billowing clouds of white smoke....then you have a bigger issue at hand.

Yeah, just condensation in the exhaust. Seems to do it more on very humid nights.

  • 1 month later...
jvsodano New Member

jvsodano

Posted
Posted

has anyone had their dealer pressure test the injectors, or check valve? I'll bet tat is where the problem lies. Mine did not emit black smoike until about 10,000 miles. I'm thinking the injectors are flooding the cylinders and that is what is causing the black smoke.

  • 2 months later...
Dnt Senior Enthusiast

Dnt

Posted
Posted

Hmm interesting reading on fuel quality I may try some top tier fuel maybe some Shell for a while and see if I notice a difference. I have noticed black smoke several times but will start paying more attention now. The way these modern engines are set up I can see fuel quality as being more critical now. I just hate that I have been using mostly walmart fuel up to now at 29k miles I may have already ruined my engine dagnabit

Ventilator Senior Enthusiast

Ventilator

Posted
Posted

Hmm interesting reading on fuel quality I may try some top tier fuel maybe some Shell for a while and see if I notice a difference. I have noticed black smoke several times but will start paying more attention now. The way these modern engines are set up I can see fuel quality as being more critical now. I just hate that I have been using mostly walmart fuel up to now at 29k miles I may have already ruined my engine dagnabit

I use Shell 87, and don't notice the black smoke. I think some of the trucks are running too rich, and that is where the puff of black smoke is coming from. Even more on the higher octane gas.

 

I get the same thing if I run premium in my Camaro that was designed for 87 octane.

  • 1 year later...

Archived

This topic is now archived and is closed to further replies.

Go to topic listing

  • Latest Articles

  • Posts

    • Atlas
      Acceptably cheap tires?

      By Atlas · Posted

      Which one, the AT or AS?   Starfire is made by Cooper/Goodyear but at $85/tire I'd think I'd need to level-set my expectations that they may not even be round 😉 But you're saying they're decent?   I'm already into this thing $1506 in parts, fluids, etc. Totaled all my receipts today. $250 of that was replacing an EGR and MAP sensor that were probably fine, but I'm not going to return the parts since they've been installed. I'm cheap, but not that cheap. I use it, I keep it!   I may or may not make money if I sell the truck at this point, but, that wasn't really the point. And if I billed my time, I'd be hosed for real. My thought on the tires is I "might" put 1,000 miles on before selling it. I just don't want to put absolute junk on it, that doesn't do anyone any good. If the Solus solidly isn't junk, I'll definitely consider them.        
    • rjgvt
      Is your l8t engine bay super dusty?

      By rjgvt · Posted

      I leave mine as is. I'm always a trip away from riding on unpaved roads. Dealer can clean it when they prep it after I trade it in for another new truck.
    • Grumpy Bear
      Acceptably cheap tires?

      By Grumpy Bear · Posted

      I have these on two vehicles and love them. Pepper is one of them 😉 
    • Atlas
      Acceptably cheap tires?

      By Atlas · Posted

      4WD. Far as I know it came stock with P's and not LT's. Definitely planning to put P's on it, but stock is a 109 XL load rating so I should probably stick within that guideline.   No rebates on anything I can see at the moment. Discount Tire is offering $50 off, but Pep Boys is very competitive on price, and also carries all the off-brand stuff. Les Schwab always wants an arm/leg, but they do good work.   It still has the original spare. Goodyear Wrangler RT/S, thing looks like a tractor tire LOL!! How times have changed.    
    • JohnRoy
      2020 Sierra 2500 windows rolling down

      By JohnRoy · Posted

      2020 Sierra 2500 HD (base model) gas engine 4wd.    All 4 windows roll down on their own. Happens somewhat randomly after stop and engine off - when engine turned off, when walking away from vehicle before or after locks activated. Pulled the window fuse F14 Instrument Panel Fuse Block Right; the driver's side still activates from driver's side door panel; passenger and back seat windows activate from local switches on their doors but not from driver's side group of switches. Power mirrors don't activate with fuse removed either (same fuse for both circuits). Problem not solved.    How can they even activate with fuse removed but they are all still opening and can control from each door?  When they open on their own, I can shut them from the switch in each door, but they don't stay closed.    Seems to be activated somehow with key fob; something bumping the key fob in my pocket or just handling - removed key fob and took it far enough away and now the windows stay closed. Replaced key fob batty just in case, no change.    Sounds like some kind of wiring short or maybe electronics. Dealer will first replace electronic control module without checking anything else and I anticipate problem will still exist since their troubleshooting skills are limited to "do whatever the computer says".  In any case, keyfob seems to be activating the circuitry.    Surely I'm not the only one with this issue, but I can't find anything related on the site. What do yall think?   JohnRoy  

  • GM-Trucks.com Clubs

  • Popular Contributors

×
×
  • Create New...