Blowing black smoke when flooring accelerator

[LVNeptune]

Normal or no?

Only happens when flooring accelerator not sure if it's a bad fuel pump or something that would cause that. I know on some vehicles it's normal. Thanks.

 

[Donnie Yukonie]

Uh unless it's a diesel than no your truck is fubar


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[LVNeptune]

In what sense since I just had a ton of work done to it. I just assumed it was normal. Did it before and after. Fuel injectors? Literally only happens when flooring it.

 

[Donnie Yukonie]

What year and engine.? If I can remember correctly white smoke is gas and black is oil or that may be flipped idk it's late but unless you have a diesel which is very common to blow black clouds a gas engine shouldnt do that do you have a turbo in it?


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[LVNeptune]

White coolant
Black gas
Bluish/white oil

5.7 vortec 96. Not diesel.

This is black only full throttle.

 

[SunlitComet]

if you have black sooty exhaust then you fuel pressure is to high, injectors are staying pulse width to long or you intake system is plugged. Basically to much gas is being dump in at WOT. You pump seems more then good enough at this point. A new spider upgrade would fix an injector / regulator issue for about $250 if needed. Tat only leave pcm fuel/ ignition mapping, air filter, map or maf sensors.

 

[Gzes]

Yea no normal. Like sc said u should get a spider upgrade. Not even my old Chevy does that it just shoots flames

 

[LVNeptune]

Lol.
@G you fix your speedo/tach yet ?

---------- Post added at 08:40 AM ---------- Previous post was at 08:35 AM ----------

Any recommended spider assemblies?
This Delphi looks the best bang per buck

http://www.amazon.com/Delphi-FJ1056...tomotive&Make=GMC|48&Year=1996|1996&carId=002

---------- Post added at 09:42 AM ---------- Previous post was at 08:40 AM ----------

I can't find a single reference to anyone having this issue or the fuel injector assembly causing this at all. I have NO symptoms of a bad fuel spider. No rough idle, starts first crank, 12ish mpg. I'm inclined to believe something else would be causing it. Remember this is ONLY at max open throttle.

Truck runs great, no loss of power, nothing. Maybe this is one issue I should just let go.

---------- Post added at 09:43 AM ---------- Previous post was at 09:42 AM ----------

How do I check map/maf sensors?

---------- Post added at 09:45 AM ---------- Previous post was at 09:43 AM ----------

Also, ZERO codes.

 

[Bigbody250]

Could be o2 sensors or your cats... Just running rich at WOT, isn't really a bad thing. I would prefer that to running lean. Maybe the truck was tuned before you got it?

 

[LVNeptune]

Noone would have tuned this truck. It wasn't even remotely taken care of.

 

[moviewithnotitle]

I have something similar to this. It's not black smoke, but some black. It happens on WOT, at high RPM's. Picture launching out of a toll plaza and getting up to 70 ASAP. This is the ONLY time that I would get this condition, normal driving never. I have seen new cars do this as well under heavy acceleration, so I have never been concerned.

I would think that if you noticed a change in MPG, sluggish acceleration, tough starting, misses etc, that you could have a bigger issue that is causing what you described. I don't have any of that, I have had my truck maintained regularly and it was tuned up within the last year, so I have not been concerned about it. Best I could think is that some oil is getting into the cylinders, but never enough to cause a concern. I change the oil at 5k, and it's never below the optimum range for oil.

 

[LVNeptune]

^^^^ exactly what I was thinking.

I figured there had to be people in the same situation and I too have seen newish trucks do the same thing and they are definately not diesel.

 

[SunlitComet]

That Delphi spider should be the only bang you should ever use period. It will have a new fuel regulator already installed. you will need to get a hold of scanner with live data view and I should be able to get you the values on what you should see. Any chance your vehicle may have been previously tuned performance wise?

 

[LVNeptune]

Doubtful it was ever tuned. Any android/iPhone data viewer you can recommend ?

 

[SunlitComet]

http://www.palmerperformance.com/products/dashcommand/index.php plus required hardware interface. that will depend on phone connectivity option but USB, Wi-fi and bluetooth are available. I actually use the windows based ScanXL pro software with the gm add-on from them.

 

[NOVAhoe]

my stepdad always told me it was from carbon buildup in the combustion chambers thats burning off at higher rpms, mine used to do it, but after my tune and now that my foots always down i havent noticed it at all haha

 

[LVNeptune]

With that logic wouldn't it eventually stop if I continuously forced it?

 

[LVNeptune]

Also update: there seems to be a lot of water coming out of the tailpipe. Clear water doesn't look like coolant. May or may not be related

 

[Chevyrider619]

I have water also coming out the muffler. I even smelled it to see if it was antifreeze but no..

 

[LVNeptune]

It made a puddle and I grabbed some of the water and it had carbon deposits in it lol. The water is cleaning it out.

Thinking about it, it might be when I backed into the lake a few days ago, it might have been stuck in the muffler.