I have a question when I get on my truck really hard some gray, black colored smoke blows out the tailpipe. I know its not burning oil cause it would be white smoke and my truck never uses oil, I have heard that gray, black smoke is unused fuel that wasn't burnt up. My truck has a sct tuner, banks exhaust, jlt intake, rear cats deleted, efans. I'm wanting to make sure its nothing that will hurt the truck thanks for any input.

 

i was going to say the intake is probably making it run lean but you said its black smoke.

 

i know that the black smoke on a diesel is unburned fuel, but a gas engine i am not sure. when i had my 96 trans am apparently i had black smoke like you. someone told me it was burnt piston rings, but i think he was mistaken. hopefully someone will chime in with some info.

 

Burnt piston would be white smoke cause its burning oil, I have seen a few vettes, and other performance cars and trucks blow black, gray smoke when they get on it, I also have a 05 Ford f350 with the diesel and its turned up and it blows black smoke too.

 

i thought white with a sweet smell was coolant burning and blueish white was oil. i KNOW for a fact that diesels will put out black smoke as unburned fuel. but like i said gas engines i dont know. just know that someone told me my trans am did it when i got on it. and it wasnt beat on before i got it. and yes i put it thru its paces but nothing a vette engine cant handle

 

Yeah blueish white is what I meant its probably nothing but my fuel is set to high on my programmer @ WOT but i was just wondering

 

"Blueish" is oil, and it doesn't take much at all to get smoke when you burn oil.

Grey to black is a rich running engine. I suspect that is what you have.

White smoke (vapor) is engine coolant.

- Jack

 

OYeah that's what I thought it was rich. I need to get a custom tune and probably change my plugs. I have 85,000 miles on the stock ones.

 

for the love of Jesus, u r running an 04 with that jlt intake w/o custom tunes?

 

No I am running the tune that came with the sct tuner and intake when I bought it I'm talking about like a mail order tune from vmp, troyer, PHP, etc.

 

You need a custom tune on an 04 to make up fpr the intake. I'm shocked that you aren't throwing any codes.

 

LOL when you buy the jlt intake and sct tuner from jlt the programmer already has a tune for the intake, you go under intakes in the tuner and you select jlt intake and there's my tune for it.

 

I puff out black smoke as well and I am tuned, it did it before when it was all stock as well.

 

OK I just wanted to make sure it wasn't nothing bad

 

nothing to bad. With black smoke, your truck is running rich. (blue/gray= oil; white=coolant) Running it this way for to long can prematurely kill/clog your catalytic converters. This might be a fuel table problem in the PCM. Or if the O2 sensors are going bad it also can affect the fuel load.